US2981730A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Organophosphorous-modified cellulose esters
Assignee: American Oil Co
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Filing: 1957-08-29
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Granted: 1961-04-25
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Expires: 1977-08-29
Abstract
No abstract record available.
Inventors
- 👤 Eugene C Martin
- 👤 Joe T Kelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 17:40
CPC Classifications
B; B01; B01D; B01D71/00; B01D71/06; B01D71/08; B01D71/12; C; C08; C08B; C08B7/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
124 words
AS A COMPOSITION OF MATTER, AN ORGANOPHOSPHOROUS MODIFIED CELLULOSE ESTER WHICH IS PREPARED BY DISSOLVING A CARBOXYLIC ACID ESTER OF CELLULOSE CONTAINING FREE HYDROXYL GROUPS IN A SOLVENT AND REACTING AN ORGANIC CHLOROPHOSPHOROUS COMPOUND WITH SAID CELLULOSE ESTER UNDER ANHYDROUS CONDITIONS AND IN THE PRESENCE OF A HYDROGEN CHLORIDE ACCEPTOR AND THEREBY PRODUCING AN ORGANOPHOSPHOROUS MODIFIED CELLULOSE ESTER IN SOLUTION IN SAID SOLVENT, COMMINGLING WITH SAID SOLUTION A LIQUID IN WHICH THE ORGANOPHOSPHOROUS MODIFIED CELLULOSE ESTER IS INSOLUBLE, SAID LIQUID BEING USED IN AN AMOUNT TO CAUSE PRECIPITATION OF A FIRST FRACTION COMPRISING ONLY A FIBROUS PORTION BUT NOT ALL OF SAID ORGANOPHOSPHOROUS MODIFIED CELLULOSE ESTER IN FIBROUS FORM, AND RECOVERING A FILM OF THE PRECIPITATED PORTION OF THE FIBROUS ORGANOPHOSPHOROUS MODIFIED CELLULOSE ESTER.
Claim 2
Dependent Claim
124 words
AS A COMPOSITION OF MATTER, AN ORGANOPHOSPHOROUS MODIFIED CELLULOSE ESTER WHICH IS PREPARED BY DISSOLVING A CARBOXYLIC ACID ESTER OF CELLULOSE CONTAINING FREE HYDROXYL GROUPS IN A SOLVENT AND REACTING AN ORGANIC CHLOROPHOSPHOROUS COMPOUND WITH SAID CELLULOSE ESTER UNDER ANHYDROUS CONDITIONS AND IN THE PRESENCE OF A HYDROGEN CHLORIDE ACCEPTOR AND THEREBY PRODUCING AN ORGANOPHOSPHOROUS MODIFIED CELLULOSE ESTER IN SOLUTION IN SAID SOLVENT, COMMINGLING WITH SAID SOLUTION A LIQUID IN WHICH THE ORGANOPHOSPHOROUS MODIFIED CELLULOSE ESTER IS INSOLUBLE, SAID LIQUID BEING USED IN AN AMOUNT TO CAUSE PRECIPITATION OF A FIRST FRACTION COMPRISING ONLY A FIBROUS PORTION BUT NOT ALL OF SAID ORGANOPHOSPHOROUS MODIFIED CELLULOSE ESTER IN FIBROUS FORM, AND RECOVERING A FILM OF THE PRECIPITATED PORTION OF THE FIBROUS ORGANOPHOSPHOROUS MODIFIED CELLULOSE ESTER.
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) | 1964-04-24 | 1964-10-24 | 1965-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-04-24 | 1968-10-24 | 1969-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-04-24 | 1972-10-24 | 1973-04-25 | $7700.00 | Window Closed / Lapsed |