US3761275A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Boron hydrides as reduction sensitizers in developing out silver halide emulsions
Assignee: EIDP Inc
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Filing: 1971-04-14
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Granted: 1973-09-25
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Expires: 1991-04-14
Abstract
Abstract PHOTOGRAPHIC SILVER HALIDE, NEGATIVE-WORKING, DEVELOPING-OUT EMULSIONS ARE PREPARED WHICH HAVE THEIR SENSITIVITY INCREASED BY THE ADDITION OF AT LEAST ONE BORON HYDRIDE IN WHICH THE SKELETAL FRAMEWORK FORMS A POLYHEDRON OR A FRAGMENT THEREOF, AND CONTAINS FROM 6 TO 12 BORON ATOMS AND MAY CONTAIN HETEROSKELETAL ATOMS SELECTED FROM THE GROUP, CARBON, SULFUR AND NITROGEN.
Inventors
- 👤 J Bigelow
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 05:22
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/005; G03C1/06; G03C1/08
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) | 1976-09-24 | 1977-03-26 | 1977-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-24 | 1981-03-26 | 1981-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-24 | 1985-03-26 | 1985-09-25 | $7700.00 | Window Closed / Lapsed |