Patent US2805173A successfully refreshed from Google Patents.
US2805173A
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Photographic film base and process for the manufacture thereof
Assignee: Imperial Chemical Industries Ltd
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Filing: 1956-06-11
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Granted: 1957-09-03
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Expires: 1976-06-11
Abstract
No abstract record available.
Inventors
- 👤 Ambler Arnold Edwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 08:08
CPC Classifications
C; C08; C08J; C08J7/00; C08J7/12; C08J7/14; G; G03; G03C; G03C1/00; G03C1/76; G03C1/795; G03C1/7954; G03C1/91; C08J2367/00; C08J2367/02; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/31725; Y10T428/31736; Y10T428/31768
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
31 words
A PROCESS FOR THE MANUFACTURE OF NEW PHOTOGRAPHIC FILM BASE WHICH COMPRISES TREATING A POLYETHYLENE TEREPHTHALATE FILM WITH CHLOROSULPHONIC ACID AND SUBSEQUENTLY COATING SAID FILM WITH A LAYER OF HARDENED GELATINE.
References Cited (Backward Citations)
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US2759848A
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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) | 1960-09-02 | 1961-03-04 | 1961-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-09-02 | 1965-03-04 | 1965-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-09-02 | 1969-03-04 | 1969-09-03 | $7700.00 | Window Closed / Lapsed |