US3793043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cellulose ester dope solution containing inorganic chromium salts
Assignee: Eastman Kodak Co
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Filing: 1969-07-30
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Granted: 1974-02-19
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Expires: 1989-07-30
Abstract
Abstract The addition of certain soluble metallic salts to dopes of cellulose esters having at most about 3.3 percent hydroxyl results in improved stripping performance of the resulting films after the dopes have been cast and partially dried on a smooth metallic sheet casting surface.
Inventors
- 👤 W White
- 👤 C Dresie
- 👤 W Tucker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:35
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/795
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |