US2874045A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process of washing and protecting photographic silver images
Assignee: Polaroid Corp
•
Filing: 1954-02-26
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Granted: 1959-02-17
•
Expires: 1974-02-26
Abstract
No abstract record available.
Inventors
- 👤 Edwin H Land
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 07:34
CPC Classifications
G; G03; G03C; G03C11/00; G03C11/08
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
79 words
IN A PROCESS FOR WASHING AND PROTECTING A PHOTOGRAPHIC TRANSFER-DIFFUSION SILVER PRINT, THE STEP OF APPLYING TO ONE FACE THEREOF, IN A THIN LAYER, A COMPOSITION COMPRISING A DISPERSION PREPARED FROM A VINYLPYRIDINE POLYMER, A HYDANTOIN FORMALDEHYDE CONDENSATION POLYMER, WATER AND A WATER-MISCIBLE, ORGANIC SOLVENT, AND THE STEP OF FORMING A PROTECTIVE COATING ON SAID PRINT BY DRYING SAID LAYER TO PRODUCE A RESIDUE COMPOSED PRIMARILY OF A MIXTURE OF SAID VINYLPYRIDINE POLYMER AND SAID HYDANTOIN FORMALDEHYDE CONDENSATION POLYMER.
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US2448508A
Cited
US2662822A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-02-16 | 1962-08-18 | 1963-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-02-16 | 1966-08-18 | 1967-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-02-16 | 1970-08-18 | 1971-02-17 | $7700.00 | Window Closed / Lapsed |