US3778269A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for use of inorganic azides as photosensitive materials at low temperatures
Assignee: United States Department of the Army
•
Filing: 1971-11-19
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Granted: 1973-12-11
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Expires: 1991-11-19
Abstract
Abstract A new method is provided for the production of permanent photographic images at low temperatures by the use of heavy metal azides such as thallium, lead and silver azide as the photosensitive material in the photographic process.
Inventors
- 👤 D Wiegand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:24
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/695
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
12 words
The method of claim 1, wherein the temperature is below about 80*K.
Claim 2
Dependent Claim
12 words
The method of claim 1, wherein the metal azide is thallium azide.
Claim 3
Dependent Claim
12 words
The method of claim 2, wherein the metal azide is thallium azide.
References Cited (Backward Citations)
US1880503A
Cited
US2019737A
Cited
US2095839A
Cited
US2414839A
Cited
US2703283A
Cited
US3298833A
Cited
US3316088A
Cited
US3377169A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-12-10 | 1977-06-11 | 1977-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-10 | 1981-06-11 | 1981-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-10 | 1985-06-11 | 1985-12-11 | $7700.00 | Window Closed / Lapsed |