US2939806A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Subbed cellulose triacetate photographic film
Assignee: Celanese Corp
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Filing: 1956-04-16
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Granted: 1960-06-07
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Expires: 1976-04-16
Abstract
No abstract record available.
Inventors
- 👤 Jaffe Joseph
- 👤 Schneider Alfred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 06:38
CPC Classifications
G; G03; G03C; G03C1/00; G03C1/76; G03C1/91; G03C1/93
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
136 words
METHOD FOR SUBBING A CELLULOUS TRIACETATE FILM HAVING AN ACETYL VALUE OF AT LEAST 58% BY WEIGHT WHICH COMPRISES APPLYING TO SAID FILM A COATING COMPOSITION COMPRISING A SOLUTION OF CELLULOSE ACETATE HAVING AN ACETYL VALUE BETWEEN 52 AND 56% BY WEIGHT, CALCULATED AS ACETIC ACID, IN A SOLVENT COMPRISING METHYLENE CHLORIDE AND METHANOL, DRYING SAID SOLUTION TO THEREBY DEPOSIT A LAYER OF SAID SECONDARY CELLULOSE ACETATE ON SAID FILM, APPLYING TO SAID DEPOSITED LAYER A SECOND COATING COMPOSITION COMPRISING A SOLUTION OF GELATIN, AN ACID PEPTIZING AGENT FOR SAID GELATIN, AND CELLULOSE ACETATE HAVING AN ACETYL VALUE BETWEEN 52 AND 56% BY WEIGHT, CALCULATED AS ACETIC ACID, IN A SOLVENT COMPRISING METHANOL AND ACETONE AND DRYING SAID SECOND COATING COMPOSITION TO THEREBY DEPOSIT A SECOND LAYER COMPRISING SECONDARY CELLULOSE ACETATE AND GELATIN ON SAID FILM.
Claim 2
Dependent Claim
136 words
METHOD FOR SUBBING A CELLULOUS TRIACETATE FILM HAVING AN ACETYL VALUE OF AT LEAST 58% BY WEIGHT WHICH COMPRISES APPLYING TO SAID FILM A COATING COMPOSITION COMPRISING A SOLUTION OF CELLULOSE ACETATE HAVING AN ACETYL VALUE BETWEEN 52 AND 56% BY WEIGHT, CALCULATED AS ACETIC ACID, IN A SOLVENT COMPRISING METHYLENE CHLORIDE AND METHANOL, DRYING SAID SOLUTION TO THEREBY DEPOSIT A LAYER OF SAID SECONDARY CELLULOSE ACETATE ON SAID FILM, APPLYING TO SAID DEPOSITED LAYER A SECOND COATING COMPOSITION COMPRISING A SOLUTION OF GELATIN, AN ACID PEPTIZING AGENT FOR SAID GELATIN, AND CELLULOSE ACETATE HAVING AN ACETYL VALUE BETWEEN 52 AND 56% BY WEIGHT, CALCULATED AS ACETIC ACID, IN A SOLVENT COMPRISING METHANOL AND ACETONE AND DRYING SAID SECOND COATING COMPOSITION TO THEREBY DEPOSIT A SECOND LAYER COMPRISING SECONDARY CELLULOSE ACETATE AND GELATIN ON SAID FILM.
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) | 1963-06-07 | 1963-12-07 | 1964-06-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-06-07 | 1967-12-07 | 1968-06-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-06-07 | 1971-12-07 | 1972-06-07 | $7700.00 | Window Closed / Lapsed |