US3592649A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Color photographic process for producing visually transparent but photographically opaque photomasks
Assignee: Mead Corp
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Filing: 1967-04-21
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Granted: 1971-07-13
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Expires: 1987-04-21
Abstract
Abstract PHOTOMASKS AND A PROCESS FOR PRODUCING THE SAME WHICH COMPRISES PREHARDENING A HIGH RESOLUTION PHOTOGRAPHIC PLATE CONTAINING A LATENT PHOTOGRAPHIC IMAGE IN A PREHARDENING BATH, DEVELOPING THE PLATE IN A DEVELOPER CONTAINING A MAGENTA AND A YELLOW DYE COUPLER AND APPROPRIATE DEVELOPING AGENTS AND THEN BLEACHING AND STABILIZING THE RESULTANT PLATE. A PHOTOMASK IS OBTAINED CONTAINING A DYE IMAGE IN PLACE OF THE NORMAL OPAQUE BACKGROUND. IT IS USEFUL IN PHOTOMECHANICAL REPRODUCTION, PARTICULARLY WITH POSITIVE PHOTORESISTS IN THE PRODUCTION OF SEMICONDUCTIVE DEVICES, AND ESPECIALLY WHERE MULTIPLE REGISTERING AND PRINTING OPERATIONS ARE REQUIRED.
Inventors
- 👤 Harry N Parsonage
- 👤 Melvyn I Kruger
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 23:13
CPC Classifications
G; G03; G03F; G03F1/00; G03F1/54
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) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |