Patent US2392417A successfully refreshed from Google Patents.
Patent US3003875A successfully refreshed from Google Patents.
US3003875A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photographic products and processes
Assignee: Polaroid Corp
•
Filing: 1958-05-12
•
Granted: 1961-10-10
•
Expires: 1978-05-12
Abstract
No abstract record available.
Inventors
- 👤 William H Ryan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:58
CPC Classifications
G; G03; G03C; G03C8/00; G03C8/02; G03C8/04; G03C8/06; G03C1/00; G03C1/005; G03C1/04; G03C1/047
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
63 words
IN A PHOTOGRAPHIC PROCESS, THE STEP WHICH COMPRISES DEVELOPING A LATENT IMAGE CONTAINED IN AN EXPOSED PHOTOSENSITIVE ELEMENT, SAID ELEMENT COMPRISING A SILVER HALIDE GELATIN EMULSION CONTAINING DEACETYLATED CHITIN WHEREIN THE RATIO, BY WEIGHT, OF DEACETYLATED CHITIN TO GELATIN IS FROM 1:1.7 TO 1:6, INCLUSIVE, WITH AN ALKALINE PROCESSING COMPOSITION, FOR A TIME SUFFICIENT TO DEVELOP SAID LATENT IMAGE TO A SILVER IMAGE.
References Cited (Backward Citations)
GB458813A
Cited
US2139689A
Cited
US2239718A
Cited
US2363764A
Cited
US2322085A
Cited
US2379065A
Cited
US2543181A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-10-09 | 1965-04-10 | 1965-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-10-09 | 1969-04-10 | 1969-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-10-09 | 1973-04-10 | 1973-10-10 | $7700.00 | Window Closed / Lapsed |