US3317513A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for cross-linking cellulose compounds by intramolecular esterification
Assignee: Individual
•
Filing: 1965-04-22
•
Granted: 1967-05-02
•
Expires: 1985-04-22
Abstract
No abstract record available.
Inventors
- 👤 Frederick A H Rice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:02
CPC Classifications
C; C06; C06B; C06B21/00; C06B21/0008; C06B21/0016; C08; C08B; C08B15/00; C08B15/10; C08B3/00; C08B3/22; C08B5/00; C08B5/02; C08B5/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
49 words
A PROCESS OF CROSS-LINKING A CELLULOSE COMPOUND THROUGH FORMATION OF INTRAMOLECULAR ESTER GROUPS WHICH COMPRISES SUBJECTING A CELLULOSE COMPOUND CONTAINING CAROXYL AND HYDROXYL GROUPS ON ADJACENT CHAINS OF THE MOLECULE OF THE COMPOUND TO ESTERIFICATION IN A VOLATILE ORGANIC SOLVENT AND IN THE PRESENCE OF AN ACID ESTERIFICATION CATALYST.
Claim 2
Dependent Claim
49 words
A PROCESS OF CROSS-LINKING A CELLULOSE COMPOUND THROUGH FORMATION OF INTRAMOLECULAR ESTER GROUPS WHICH COMPRISES SUBJECTING A CELLULOSE COMPOUND CONTAINING CAROXYL AND HYDROXYL GROUPS ON ADJACENT CHAINS OF THE MOLECULE OF THE COMPOUND TO ESTERIFICATION IN A VOLATILE ORGANIC SOLVENT AND IN THE PRESENCE OF AN ACID ESTERIFICATION CATALYST.
References Cited (Backward Citations)
NL8487C
Cited
GB192173A
Cited
US1946647A
Cited
US2307783A
Cited
US2339912A
Cited
US2336985A
Cited
US2598407A
Cited
US2520609A
Cited
US2730542A
Cited
US2758112A
Cited
US2776918A
Cited
US2798009A
Cited
US2865870A
Cited
US2871143A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-05-01 | 1970-10-31 | 1971-05-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-01 | 1974-10-31 | 1975-05-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-01 | 1978-10-31 | 1979-05-02 | $7700.00 | Window Closed / Lapsed |