Patent US4733575A successfully refreshed from Google Patents.
Patent US2622080A successfully refreshed from Google Patents.
US2622080A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for the manufacture of high butyryl cellulose esters
Assignee: Eastman Kodak Co
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Filing: 1950-06-05
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Granted: 1952-12-16
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Expires: 1970-06-05
Abstract
No abstract record available.
Inventors
- 👤 George A Richter
- 👤 Ervin L Perkins
- 👤 Lloyd E Herdle
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 12:04
CPC Classifications
C; C08; C08B; C08B1/00; C08B1/02; C08B3/00; C08B3/08
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
A PROCESS OF ACTIVATING CELLULOSE FOR THE FORMATION OF BUTYRYL CONTAINING CELLULOSE ESTERS COMPRISING SUBJECTING THE CELLULOSE IN SHEET FORM TO A WATER WETTING, DISPLACEMENT OF THE WATER BY A DISPLACEMENT AGENT SELECTED FROM THE GROUP CONSISTING OF METHANOL, ETHANOL, FORMIC ACID, ACETIC ACID, ACETONE, ACETONITRILE, METHYL ETHYL KETONE, AND METHYL FORMATE, AND FOLLOWING THIS DISPLACEMENT WITH A SECOND DISPLACEMENT OF THE ORGANIC REAGENT WITH BUTYRIC ACID.
Claim 2
Dependent Claim
67 words
A PROCESS OF ACTIVATING CELLULOSE FOR THE FORMATION OF BUTYRYL CONTAINING CELLULOSE ESTERS COMPRISING SUBJECTING THE CELLULOSE IN SHEET FORM TO A WATER WETTING, DISPLACEMENT OF THE WATER BY A DISPLACEMENT AGENT SELECTED FROM THE GROUP CONSISTING OF METHANOL, ETHANOL, FORMIC ACID, ACETIC ACID, ACETONE, ACETONITRILE, METHYL ETHYL KETONE, AND METHYL FORMATE, AND FOLLOWING THIS DISPLACEMENT WITH A SECOND DISPLACEMENT OF THE ORGANIC REAGENT WITH BUTYRIC ACID.
References Cited (Backward Citations)
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US2478396A
Cited
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Cited
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Cited
US2487892A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1955-12-16 | 1956-06-16 | 1956-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-12-16 | 1960-06-16 | 1960-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-12-16 | 1964-06-16 | 1964-12-16 | $7700.00 | Window Closed / Lapsed |