US3801324A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Non-conflicting double image photographic film employing silver based and photofluorescer compounds
Assignee: Wyeth Holdings LLC
•
Filing: 1972-12-29
•
Granted: 1974-04-02
•
Expires: 1992-12-29
Abstract
Abstract Photographic film element having photographic medium and optically active medium for providing identifying indicia, the optically active medium being a compound which is converted to a fluorescent state by short wave ultraviolet radiation and may be read by longer wave ultraviolet.
Inventors
- 👤 R Postal
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:54
CPC Classifications
G; G03; G03C; G03C11/00; G03C11/02; G03C1/00; G03C1/005; G03C1/46
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
23 words
The element of claim 1 wherein said photofluorescer is coated on the opposite side of said film base from the light sensitive emulsion.
Claim 2
Dependent Claim
15 words
The element of claim 1 wherein said photofluorescer is incorporated with said light sensitive emulsion.
Claim 3
Dependent Claim
14 words
The element of claim 1 wherein said photofluorescer is incorporated in said film base.
Claim 4
Dependent Claim
13 words
The element of claim 1 wherein said light sensitive emulsion is a silver-halide.
Claim 5
Dependent Claim
10 words
The element of claim 1 wherein said photofluorescer is 9,10-Diphenyl-9,10-dihydroanthracene-9,10-anhydride.
Claim 6
Dependent Claim
12 words
The element of claim 1 wherein said film base is cellulose acetate.
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) | 1977-04-01 | 1977-10-01 | 1978-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-04-01 | 1981-10-01 | 1982-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-04-01 | 1985-10-01 | 1986-04-02 | $7700.00 | Window Closed / Lapsed |