US2816106A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of hydrolyzing butyric acid
Assignee: —
•
Filing: —
•
Granted: 1957-12-10
•
Expires: 1974-12-10
Abstract
No abstract record available.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 03:01
CPC Classifications
C; C08; C08B; C08B3/00; C08B3/16; C08B3/06; C08B3/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
59 words
A METHOD OF HYDROLYZING A BUTYRIC ESTER OF CELLULOSE CONTAINING AT LEAST 20% OF BUTYRYL WHICH COMPRISES ALLOWING THE CELLULOSE ESTER IN SOLUTION IN A SOLVENT MIXTURE THEREFOR OF ACETONE, METHANOL, WATER AND AN ALKALI METAL COMPOUND HAVING BASIC CHARACTER TO STAND FOR A TIME SUFFICIENT TO IMPART A HYDROXYL CONTENT TO THE ESTER OF 0.5-7% HYDROXYL BY WEIGHT.
Claim 2
Independent Claim
59 words
A METHOD OF HYDROLYZING A BUTYRIC ESTER OF CELLULOSE CONTAINING AT LEAST 20% OF BUTYRYL WHICH COMPRISES ALLOWING THE CELLULOSE ESTER IN SOLUTION IN A SOLVENT MIXTURE THEREFOR OF ACETONE, METHANOL, WATER AND AN ALKALI METAL COMPOUND HAVING BASIC CHARACTER TO STAND FOR A TIME SUFFICIENT TO IMPART A HYDROXYL CONTENT TO THE ESTER OF 0.5-7% HYDROXYL BY WEIGHT.
References Cited (Backward Citations)
US1993782A
Cited
US2000620A
Cited
US2327770A
Cited
GB615602A
Cited
US2523384A
Cited
US2553664A
Cited
US2470192A
Cited
US2614941A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-12-09 | 1961-06-10 | 1961-12-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-12-09 | 1965-06-10 | 1965-12-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-12-09 | 1969-06-10 | 1969-12-10 | $7700.00 | Window Closed / Lapsed |