Patent US4656107A successfully refreshed from Google Patents.
US4656107A
Expired / Lapsed
US
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Photographic printing plate for use in a vacuum printing frame
Assignee: RCA Licensing Corp
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Filing: 1985-12-23
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Granted: 1987-04-07
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Expires: 2005-12-23
Abstract
Abstract A method for exposing a layer of photoresist on a sheet includes positioning the sheet in a vacuum printing frame comprising a glass plate carrying an opaque master pattern of metal or metal oxide. With the pattern opposite the coating, the frame is evacuated and the layer is exposed. The pattern has a substantially-uniform thickness in the range of about 0.5±0.2 micrometer. To reduce the times for evacuating and devacuating the frame, the pattern side of the glass plate carries an array of light-transparent islands up to about 3.0-micrometer thick. An overcoating of wax on the islands is a further aid.
Inventors
- 👤 John J. Moscony
- 👤 Thomas J. Michielutti
- 👤 Charles M. Wetzel
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:58
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/20; G03F7/2002; G03F7/2014; C; C23; C23F; C23F1/00; C23F1/02; H; H01; H01J; H01J9/00; H01J9/02; H01J9/14; H01J9/142; Y; Y10; Y10S; Y10S430/00; Y10S430/151; Y10S430/162
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
96 words
A photographic printing plate for use in a vacuum printing frame comprising an optically-transparent support plate having two opposed major surfaces and an optically-opaque master pattern on one of said major surfaces, said master pattern including an opaque layer of material having a substantially uniform thickness in the range of about 0.5±0.2 micrometers, said plate including a coating of islands of light-transmitting rubbery material over opaque portions of said master pattern on said one major surface, said islands being separated from each other in the non-opaque portions of said master pattern to provide continuous paths therebetween.
Claim 2
Dependent Claim
96 words
A photographic printing plate for use in a vacuum printing frame comprising an optically-transparent support plate having two opposed major surfaces and an optically-opaque master pattern on one of said major surfaces, said master pattern including an opaque layer of material having a substantially uniform thickness in the range of about 0.5±0.2 micrometers, said plate including a coating of islands of light-transmitting rubbery material over opaque portions of said master pattern on said one major surface, said islands being separated from each other in the non-opaque portions of said master pattern to provide continuous paths therebetween.
Claim 3
Dependent Claim
24 words
The plate described in claim 1 wherein said opaque material is selected from the group consisting of iron oxide, chromium metal and nickel metal.
Claim 4
Dependent Claim
19 words
The plate described in claim 1 wherein the continuous paths comprise areas that are free from said rubbery material.
Claim 5
Dependent Claim
29 words
The plate desribed in claim 1 wherein said islands have substantially uniform thickness up to about 3.0 micrometers and cover all of the opaque portions of said master pattern.
Claim 6
Dependent Claim
22 words
The plate described in claim 4 wherein said islands additionally overlap over narrow transparent areas adjacent and peripheral to said master pattern.
Claim 7
Dependent Claim
18 words
The plate described in claim 3 wherein the tops of said islands carry a thin overcoating of wax.
Claim 8
Dependent Claim
16 words
The plate described in claim 3 including a thin overcoating of wax over said rubbery material.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-04-06 | 1990-10-06 | 1991-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-04-06 | 1994-10-06 | 1995-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-04-06 | 1998-10-06 | 1999-04-07 | $7700.00 | Window Closed / Lapsed |