US3561960A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic film processing method
Assignee: Northrop Grumman Guidance and Electronics Co Inc
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Filing: 1968-04-01
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Granted: 1971-02-09
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Expires: 1988-04-01
Abstract
Abstract A METHOD FOR PROCESSING PHOTOGRAPHIC FILM WITH MULTIPLE LAYERS OF DIFFERENT VISCOUS PROCESSING REAGENTS IS DISCLOSED. THE METHOD INOLVES APPLYING A FIRST VISCOUS PROCESSING LAYER TO THE FILM FOLLOWED BY THE APPLICATION OF A SECOND VISCOUS PROCESSING LAYER UPON THE FIRST LAYER. BECAUSE THE TWO LAYERS HAVE VISCOSITIES OF AT LEAST 5,000 CENTIPOISES, THE FIRST LAYER SUPPORTS AND INITIALLY ISOLATES THE SECOND PROCESING LAYER. BOTH LAYERS ARE LEFT ON THE FILM UNTIL REAGENT FROM THE SECOND VISCOUS LAYER DIFFUSES THROUGH THE FIRST LAYER AND COMPLETS PROCESSING OF THE FILM.
Inventors
- 👤 Alvin Cronig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:58
CPC Classifications
G; G03; G03D; G03D5/00; G03D5/006; G03C; G03C5/00; G03C5/26; G03C5/261
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) | 1974-02-08 | 1974-08-10 | 1975-02-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-02-08 | 1978-08-10 | 1979-02-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-02-08 | 1982-08-10 | 1983-02-09 | $7700.00 | Window Closed / Lapsed |