US4178181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Interference film photography
Assignee: Individual
•
Filing: 1970-09-14
•
Granted: 1979-12-11
•
Expires: 1990-09-14
Abstract
Abstract This invention concerns improvements in interference film photography.
Inventors
- 👤 George M. Sawyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:48
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C7/00; Y; Y10; Y10S; Y10S430/00; Y10S430/149; Y10S430/151
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
24 words
A photo-sensitive element comprising a transparent base, a silver halide emulsion layer and a reflecting layer thereover said reflecting layer comprising indium or gallium.
Claim 2
Dependent Claim
24 words
A photo-sensitive element comprising a transparent base, a silver halide emulsion layer and a reflecting layer thereover said reflecting layer comprising indium or gallium.
Claim 3
Dependent Claim
37 words
A photo-sensitive element comprising (a) a transparent base (b) a silver-halide emulsion layer, and (c) a reflecting layer thereover, said reflecting layer comprising a metal which is solid at standard temperature, and which contains indium or gallium.
Claim 4
Dependent Claim
37 words
A photo-sensitive element comprising (a) a transparent base (b) a silver-halide emulsion layer, and (c) a reflecting layer thereover, said reflecting layer comprising a metal which is solid at standard temperature, and which contains indium or gallium.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-12-10 | 1983-06-11 | 1983-12-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-12-10 | 1987-06-11 | 1987-12-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-12-10 | 1991-06-11 | 1991-12-11 | $7700.00 | Window Closed / Lapsed |