Patent US3672899A successfully refreshed from Google Patents.
US3672899A
Expired / Lapsed
US
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High contrast photographic media
Assignee: Northrop Grumman Guidance and Electronics Co Inc
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Filing: 1970-11-02
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Granted: 1972-06-27
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Expires: 1990-11-02
Abstract
Abstract THE USE OF ARYLMERCURIC COMPOUNDS PROVIDES IMPROVED PHOTOGRAPHIC PROPERTIES TO PHOTOSENSITIVE MATERIALS, PARTICULARLY IN IMPROVING THE SENSITOMETRIC PROPERTIES OF PHOTOGRAPHIC IMAGES. SUCH IMAGES SHOW MARKEDLY HIGHER GAMMA VALUES. THE ARYLMERCURIC COMPOUNDS ARE ESPECIALLY EFFECTIVE IN SO-CALLED LOW-CONTENT SILVER HALIDE FILM, ESPECIALLY THOSE CONTAINING VERY THIN PHOTOSENSITIVE LAYERS.
Inventors
- 👤 Jean-Paul C Archambault
- 👤 William S Holmes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 09:18
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/494; G03C1/496
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) | 1975-06-27 | 1975-12-27 | 1976-06-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-06-27 | 1979-12-27 | 1980-06-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-06-27 | 1983-12-27 | 1984-06-27 | $7700.00 | Window Closed / Lapsed |