US3589901A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of making a heat developable sheet containing mercury lens
Assignee: 3M Co
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Filing: 1968-02-28
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Granted: 1971-06-29
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Expires: 1988-02-28
Abstract
Abstract A LIGHT SENSITIVE HEAT-DEVELOPABLE SHEET MATERIAL CONTAINING SILVER HALIDE AS A CATALYST PROGENITOR FOR THE OXIDATION-REDUCTION REACTION OF IMAGE-FORMING REACTANTS COMPRISING SILVER SOAP AND REDUCING AGENT INCLUDES A SOURCE OF MERCURY ION AND RESTRICTED AMOUNTS OF PHTHALAZININE, TO PROVIDE A SHEET WHICH SHOWS A NEGATIVE SLOPE IN THE D LOG E CURVE AND WHICH PRODUCES A DIRECT POSITIVE WHEN EXPOSED TO A LIGHT IMAGE OF A POSITIVE ORIGINAL AND THEN SUBJECTED TO MINIMUM HEATING REQUIRED TO PRODUCE MAXIMUM USEFUL AT UNEXPOSED AREAS.
Inventors
- 👤 Thomas D Lyons
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:08
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/494; G03C1/498
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) | 1974-06-28 | 1974-12-28 | 1975-06-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-28 | 1978-12-28 | 1979-06-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-28 | 1982-12-28 | 1983-06-29 | $7700.00 | Window Closed / Lapsed |