Patent US3578451A successfully refreshed from Google Patents.
US3578451A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Integral negative type positive photolithographic plate
Assignee: Warren SD Co
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Filing: 1967-03-29
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Granted: 1971-05-11
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Expires: 1987-03-29
Abstract
Abstract A NORMALLY NEGATIVE-WORKING LITHOGRAPHIC PLATE IS COATED WITH A CONVENTIONAL SILVER HALIDE EMULSION, AN INTERMEDIATE WATER-BARRIER COATING BEING USED TO PREVENT CO-MINGLING OF THE SENSITIZED LAYERS. THE RESULTING PLATE IS IMAGE-WISE EXPOSED TO A POSITIVE ORIGINAL AND DEVELOPED TO FORM AS IN-SITU MASK OR INTEGRAL NEGATIVE FOR A SUBSEQUENT EXPOSURE OF THE DIAZO LAYER. FOLLOWING THE SECOND EXPOSURE THE EMULSION LAYER IS REMOVED AND THE RESULTING PLATE USED TO REPRODUCE THE ORIGINAL POSITIVE PATTERN.
Inventors
- 👤 Towers Doggett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 06:01
CPC Classifications
G; G03; G03F; G03F7/00; G03F7/004; G03F7/09; G03F7/095; G03F7/0952
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |