T 1175/02 16-03-2005

1. The appeal is admissible.

2. Amendments

2.1 Compared to Claim 1 as filed, Claim 1 according to each of the main request and auxiliary requests 1 to 3 contains a number of amendments. In their letter dated 15 February 2005, and during the oral proceedings, the applicants indicated the basis for the amendments in the application as filed. Since the main request and auxiliary requests 1 to 3 fail for lack of inventive step of the subject-matter of Claim 1 (points 4 to 7, infra), the question whether the amendments are allowable can be left undecided in the present case.

3. Novelty

3.1 Novelty was not objected to in the impugned decision. The Board has no reasons to take a different position. The distinctions of the claimed subject-matter from the subject-matter of D1 will become apparent from the discussion on inventive step.

Main request

4. Inventive step

4.1 Methods of dyeing plastic lenses are known, in particular from D1, which discloses a method for colouring of a plastic lens, in which a plastic lens is faced against a substrate with a sublimate dye applied onto a surface in a vacuum atmosphere by a non-contact means; said sublimate dye is sublimated by heating said substrate so as to form a colouring layer onto the surface of said plastic lens (Claim).

4.2 The method of D1 aims at offering dyeing means for a stable plastic lens with uniform dyeing performance and excellent colour reproductive performance (page 3, last paragraph).

4.3 To achieve that aim, D1 teaches the following measures (pages 4 to 6):

(a) The dye to be applied onto the substrate is preferably a dispersion dye that can be sublimated.

(b) An ink is prepared by mixing a mixture of said dispersion dye, a binder such as a water-soluble acrylic resin and a solvent such as water.

(c) The ink is applied onto a substrate such as a paper sheet so as to obtain a dye applied substrate.

(d) The dyed surface of said dye applied substrate and a surface of a plastic lens to be dyed face each other in a non-contact state.

(e) The distance between said plastic lens and said dye applied substrate is determined by the colouring period, the heating temperature of the plastic lens and the sublimate dye, the vacuum level, the colour concentration of the plastic lens to be dyed.

(f) A distance between 1 mm to 1000 mm is preferred.

(g) The colouring is applied in a vacuum atmosphere such as 10 mmHg or less.

(h) The temperature is maintained in the range of 50 to 160°C.

(i) The dyeing period is generally between 10 s and 100 minutes.

4.4 According to Embodiment 1 of D1, a sublimate dye substrate is obtained by applying a dyeing mixture onto the entire surface of a paper substrate by using a roll coater. The coloration of the lens is carried out in a vacuum transfer device. A suitable vacuum device (shown in Figure 1) contains the following items (page 7, line 2 to page 8, penultimate paragraph):

(a) A perforated metal sheet 1;

(b) A card 2, to be positioned onto perforated metal sheet 1, on which a coated paper substrate is placed with its coated surface on the top, to ensure uniformity of heating of the dye;

(c) a sheet 4, having perforated portions in a predetermined shape, placed onto the dyed substrate, to prevent an excessive sublimation of the dye;

(d) a lens holding device 5 having, in relation to the shape of sheet 4, a shorter diameter on one of its sides and a larger diameter on the other side;

(e) a heating device 7.

4.5 As exemplified in D1, a plastic lens can be coloured with an entirely uniform colouring concentration, even if said colouring process is repeated many times (page 8, second complete paragraph). Therefore, D1 aims at a method for colouring plastic lenses without any deformation of the lenses, whereby the lenses are uniformly coloured and the reproduction of that uniform colour is excellent.

4.6 According to the present application, the problem to be solved is to provide a dyeing method capable of facilitating preparation of dyes in desired density and also dyeing plastic lenses with a stable hue or tint in every works, and improving a working environment thereof (page 2, lines 14 to 19). According to the appellants, this problem is solved by a method having the features of Claim 1.

4.7 The present application does not contain any comparative examples showing any technical advantage of the claimed method over the method of D1.

4.8 As regards improvement of the working environment, D1 discloses a dyeing method capable of dyeing a plastic lens with a uniform, stable hue or tint in every work, in which a dispersed sublimatable dye is transferred to the lens in a vacuum heating device (Figure 1 of D1), which is closed and improves the working environment as apparent from the present application. Thus, the problems of dyeing a plastic lens with a stable hue or tint in every works, and improving a working environment thereof as stated in the application as filed (page 6, lines 16 to 19; page 17, lines 13 to 15), are already solved by the method of D1, which uses a vacuum heating device similar to that used in the claimed process.

Hence, the problem to be solved over D1 is to provide a method for dyeing plastic lenses that is capable of facilitating preparation of the dyes in desired density and application thereof to a substrate.

According to the examples of the application under examination that problem has been effectively solved by a method having the features of Claim 1.

4.9 It remains to be decided whether or not the claimed solution is made obvious.

4.9.1 As regards facilitating preparation of dyes in desired density and application thereof to a substrate, the features which actually distinguish the method as claimed from the method of D1 are those defined in the first step of Claim 1 according to the main request.

These distinguishing features essentially relate to: inputting information on colour and density of an ink for an area to be printed on a substrate to a computer, which stores and controls the colour data for preparation of colour and density of an ink to be printed on the selected area.

According to the application as filed (compare page 8, lines 9 to 27): commercially available dispersible dyes, i.e. red, blue, yellow and black, are used for making the inks; the inks are filled in cartridges suitable for ink jet printers, also commercially available; the computer is a commercially available personal computer, which contains a drawing software or computer colour matching (CCM), to handle the production of a desired hue and density of the ink to be printed by the printer connected to the personal computer. The above equipment and software permit a digital control so that prints in identical color density can be output as many times as desired. The substrate on which the ink is printed is a standard, commercially available A4 white paper. In the description as well as in the examples no particular software is mentioned. During the oral proceedings, the applicants confirmed that the dyes, equipment and software were all commercially available.

Hence, it is not apparent from the disclosure that any particular selection of any of the above commercially available equipment and software is necessary for achieving the objects of the claimed subject-matter.

4.9.2 It follows from the above that the distinguishing features of Claim 1 over the method of D1 merely relate to an automation of the steps of preparing the dyes and the print area of the method of D1, whereby the automation is provided by the use of commercially available drawing packages or software provided in commercially available personal computers, connected to commercially available printers such as ink jet printers, provided with a plurality of commercially available inks, for the actual application of the desired ink colour onto a commercially available substrate such as A4 white paper.

4.9.3 It was not contested that any drawing software provided in a computer enables the creation of a print area on the screen and the reproduction thereof by printing onto a substrate. It particular, the software permits setting up a page grid, creating a layout of the print area, adding elements, transforming, arranging and formatting them, and preparing the final output. The number of shapes that can be produced is practically unlimited.

As regards computer colour matching (CCM), its function is to ensure that a colour on one medium (e.g. monitor) remains the same when converted to another medium (e.g. paper). In other words, the desired target of every colour matching is "what you see is what you get". In particular, if the final output is going to be produced on a colour printer, then there are several choices where uniform colours can be chosen from the palette or mixed to order, whatever is the mixing model (red, green, blue (RGB); hue, lightness, saturation (HLS); cyan, magenta, yellow, black (CMYK)).

The commercially available colour printers can work with a number of these models. Hence, once clicking a colour in a palette, its number is all the printer needs to know to mix up the desired ink, i.e. the necessary percentages of the primaries. And a computer thus ensures a comprehensive control over the printing process.

It was not contested either that all these items of information were available at the priority date of the application and were known to the skilled person (compare page 2, point 4.2, last sentence, of the minutes of the oral proceedings before the Examining Division).

4.9.4 The appellants argued that the skilled person did not know that sublimatable inks could be successfully used in colour printers nor could he expect that sublimation of an ink applied to a particular printed area was advantageous compared to the roller coating of the entire sheet exemplified in D1, which required the presence of a perforated plate to delimit the sublimation to a desired area. In that respect it should be taken into account that no evidence of any prejudices in the art has been submitted. Nor can the mere fact that printers, computers and software were known long before the priority date of the present application contribute to inventive step.

4.9.5 From the above it follows that the distinguishing features of the method of Claim 1 do not lead to any unexpected results over the method of D1 and thus merely reside in automation of functions previously performed by an experienced human operator. This automation, however, merely corresponds to the general trend in technology (Case law of the Boards of Appeal of the EPO, 4th edition, 2001, point I.D.7.6.20.3, in particular T 775/90 of 24 June 1992). Hence, the method of Claim 1 is obvious and cannot involve an inventive step.

4.10 Therefore, the main request is not allowable.

Auxiliary request 1

5. Claim 1 according to auxiliary request 1 contains the further amendment that the input data concern the amount, the colour hue and the density in the print area.

5.1 Based on the description as filed, that amendment is interpreted as follows:

5.1.1 Amount, colour hue and density data relate to the ink to be printed.

5.1.2 The color hue is the characteristic of the colour which is indicated by the words "red, yellow, blue, brown, etc." (page 18, lines 10 and 11), i.e. the particular tint of the selected dye.

5.1.3 The colour density describes the colour tone (page 8, line 22), which can be lighter or darker (page 11, line 5), i.e. more or less saturated, and is given in a percentage of a light-shield rate (page 18, line 12). Hence, the colour density results from the ratio between the tint and the achromatic components.

5.2 As regards the amount, reference is made to page 17, lines 17 to 19, as well as to Example 1. However, the statement on page 17 merely says that the amount is always controlled, which is typical for commercially available printers. According to Example 1, the amount merely relates to the ratio of the primary colours (red-blue-yellow, 2-1-3) to obtain the desired brown colour (page 18, line 11). This amount concerns common general knowledge, which can be input by the skilled person by merely selecting the colour in the palette of the drawing package.

5.3 Therefore, there is no basis in the application as filed for interpreting the amendment as a further input of an amount of ink to be applied to the print area, which might be related to a thickness of the colour layer applied onto the area and thus to a sublimatable amount (Article 123(2) EPC). In this respect, the applicants have not shown either which commercially available printers permit to select and control from a computer the thickness of the ink applied to the print area.

5.4 But even if the amendment to an input of the amount of the ink was related to the thickness of the colour layer, the problem to be solved would not change, since no unexpected technical effect has been shown in that respect (compare point 4.7, supra). Moreover, the method of D1 allows a control of the thickness of the coating. Hence, the subject-matter of Claim 1 according to the auxiliary request 1, for the reasons given under points 4, supra, does not involve an inventive step either.

5.5 Therefore, auxiliary request 1 is not allowable.

Auxiliary request 2

6. Claim 1 according to auxiliary request 2 is further restricted to the use of an ink jet printer.

6.1 The use of an ink jet printer is mentioned in the description of the application as filed (page 8, line 14) (Article 123(2) EPC).

6.2 In view of that amendment, the problem to be solved does not change either (compare point 4.7, supra).

6.3 As regards obviousness, the Board is of the opinion that the choice of an ink jet printer, the cheapest available printer, is the first choice that a skilled person aiming at automating the method of D1 would make, in the absence of any disincentive of course.

6.4 The allegation of the appellants that the skilled person would not have expected that sublimatable dyes could be printed with an ink jet printer has not been supported by any evidence (compare point 4.9.4, supra).

6.5 For the reasons as given under point 4, supra, the subject-matter of Claim 1 according to auxiliary request 2 does also not involve an inventive step.

6.6 Therefore, auxiliary request 2 is not allowable either.

Auxiliary request 3

7. The method of Claim 1 according to auxiliary request 3 includes a fourth step, in which the lens with the vapour-deposited dye is further heated under normal pressure up to a temperature below the lens resistible temperature to fix the dye on the lens.

7.1 This step can be conducted outside the vacuum transfer device, e.g. in an oven (35) (Figure 6; page 14, lines 8 to 20). Its purpose is to prevent that the sublimated dye deposited on the lens might come off.

7.2 The appellants had argued that this step prevented the sublimation of the colour already deposited on the plastic lens, which was a drawback of the method of D1.

7.3 Thus, a further problem should be solved, which has no link to the problem stated above (compare point 4.8, supra) in connection with the previous requests.

7.4 It has not been shown that such a problem would be solved by the additional step of Claim 1. Although the examples of the present application include such a further step to fix the dye on the lens, the application under examination does not include any comparison between a lens coloured according to the method of D1 and one which is just taken out from the vacuum transfer device and left at room temperature and normal pressure. In particular the deposition time in D1 (10 seconds to 100 minutes, page 6, line 4; 5 minutes, example, page 8) is less than or comparable to the deposition time used in the claimed process (30 to 60 minutes, page 14, lines 19 to 20; 30 minutes, Example 1). Hence, it cannot be excluded that the claimed further step merely serves the purpose of accelerating the fixation for a more economic production. It has not been shown either that the alleged additional problem of preventing sublimation of the dye already deposited on the plastic lens in the vacuum trans fer device has been solved. Consequently, the additional problem to be solved over D1 is to provide an alternative method.

7.5 As regards obviousness, the features of the fourth step of Claim 1 include any further drying of the lens at any temperature below the lens resistible temperature, such as any drying at room temperature, under normal pressure, of a lens taken out from a vacuum transfer device. Such a fixation of the dye at room temperature and normal pressure also happens to a lens of D1 after it has been taken out of the vacuum transfer device of D1. Therefore, the method of Claim 1 according to auxiliary request 3 is also obvious over the method of D1.

7.6 It follows from the above that auxiliary request 3 is not allowable either.

Auxiliary request 4

8. Auxiliary request 4 corresponds to the set of claims attached to the communication under Rule 51(4) EPC. The Board has no reasons to deviate from the position taken by the Examining Division in that respect and to restart an examination of that request on its own motion.