US4650735A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of manufacturing a metal matrix and an intermediate product obtained in performing the method
Assignee: US Philips Corp
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Filing: 1983-01-10
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Granted: 1987-03-17
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Expires: 2003-01-10
Abstract
Abstract A method of manufacturing a metal matrix in which a supporting plate bearing a photo-resist layer is irradiated patternwise, the irradiated parts are developed and thereby removed, the obtained master disc is provided with a metal peel, which subsequently is removed, whereby after removal of the patternwise irradiated parts of the photoresist layer, the remaining parts are irradiated. The invention also relates to a new intermediate product which comprises a supporting layer, a photoresist layer having an information track and an electrically conductive layer on the photoresist layer, the photoresist layer being a fully irradiated layer.
Inventors
- 👤 Antonius W. M. De Laat
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:21
CPC Classifications
C; C25; C25D; C25D1/00; C25D1/10; Y; Y10; Y10S; Y10S430/00; Y10S430/146
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
213 words
A method of manufacturing a metal matrix at least one surface of which comprises an information track readable by an optical beam or similar means said method comprising: (a) depositing on at least one surface of a transparent supporting plate a photoresist layer; (b) exposing said photoresist layer to radiation in a pattern conforming to a desired information track; (c) developing said photoresist layer with a positive-acting aqueous developer to thereby dissolve said exposed portions of said photoresist layer and thereby form said information track in said photoresist layer on said supporting plate; (d) depositing an electrically conductive layer on the surface of said photoresist layer containing said information track; (e) applying by electric deposition a metal layer on said electrically conductive layer, said metal layer and said electrically conductive layer together constituting a peelable metal layer; (f) exposing, through said transparent supporting plate, the entire surface of said photoresist layer containing said information track to radiation; (g) peeling said peelable metal layer from the surface of said photoresist containing said information track thereby forming a metal matrix a surface of which contains an information track and (h) exposing the surface of said metal matrix containing the information track to a positive-acting aqueous developer thereby removing from said surface any adhering photoresist material.
Claim 2
Independent Claim
213 words
A method of manufacturing a metal matrix at least one surface of which comprises an information track readable by an optical beam or similar means said method comprising: (a) depositing on at least one surface of a transparent supporting plate a photoresist layer; (b) exposing said photoresist layer to radiation in a pattern conforming to a desired information track; (c) developing said photoresist layer with a positive-acting aqueous developer to thereby dissolve said exposed portions of said photoresist layer and thereby form said information track in said photoresist layer on said supporting plate; (d) depositing an electrically conductive layer on the surface of said photoresist layer containing said information track; (e) applying by electric deposition a metal layer on said electrically conductive layer, said metal layer and said electrically conductive layer together constituting a peelable metal layer; (f) exposing, through said transparent supporting plate, the entire surface of said photoresist layer containing said information track to radiation; (g) peeling said peelable metal layer from the surface of said photoresist containing said information track thereby forming a metal matrix a surface of which contains an information track and (h) exposing the surface of said metal matrix containing the information track to a positive-acting aqueous developer thereby removing from said surface any adhering photoresist material.
Claim 3
Dependent Claim
14 words
The method of claim 1 wherein the electrically conductive layer is deposited by evaporation.
Claim 4
Dependent Claim
15 words
The method of claim 1 wherein the positive-acting aqueous developer is an aqueous alkaline solution.
Claim 5
Dependent Claim
48 words
A master disc, obtained in carrying out the method of claim 1, comprising a supporting plate provided on at least one side with a photoresist layer containing an information track covered with an electrically conductive layer and characterized in that said photoresist layer is a fully irradiated layer.
References Cited (Backward Citations)
US4259433A
Cited
US4308337A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-16 | 1990-09-15 | 1991-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-16 | 1994-09-15 | 1995-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-16 | 1998-09-15 | 1999-03-17 | $7700.00 | Window Closed / Lapsed |