Patent US3576638A successfully refreshed from Google Patents.
US3576638A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High molecular weight, long chain tetrazole-containing polymers for antifogging use in photographic elements
Assignee: Eastman Kodak Co
•
Filing: 1967-10-09
•
Granted: 1971-04-27
•
Expires: 1987-10-09
Abstract
Abstract NOVEL, HIGH MOLECUALR WEIGHT LONG-CHAIN POLYMERS COMPRISING RECURRING TETRZOLE MOIETIES INCORPORATED INTO THE POLYMER CHAIN OR APPENDED FROM THE POLYMER BACKBONE ARE DISCLOSED AS HAVING ANTIFOGGANT AND EMULSION STABILIZATION USE. A PHOTOGRAPHIC SILVER HALIDE EMULSION AND A PHOTOGRAPHIC ELEMENT COMPRISING SAID EMULSION EACH COMPRISING SAID HIGH MOLECULAR POLYMERS IN A CONCENTRATION SUFFICIENT TO FOG STABILIZE AND PROTECT SAID EMULSION ARE DISCLOSED.
Inventors
- 👤 Richard C Tuites
- 👤 Thomas E Whiteley
- 👤 Louis M Minsk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 00:56
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/30; C08F8/34; C08G; C08G69/00; C08G69/02; C08G69/26; C08G73/00; C08G73/06; C08G73/0605; G; G03; G03C; G03C1/00; G03C1/005; G03C1/04; G03C1/053; G03C1/06; G03C1/34; G03C1/346
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1974-04-26 | 1974-10-26 | 1975-04-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-26 | 1978-10-26 | 1979-04-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-26 | 1982-10-26 | 1983-04-27 | $7700.00 | Window Closed / Lapsed |