Patent US3958124A successfully refreshed from Google Patents.
Patent US3294779A successfully refreshed from Google Patents.
US3294779A
Expired / Lapsed
US
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Process for making crosslinked cellulose derivatives utilizing acetylenic carboxylic acids
Assignee: Individual
•
Filing: 1964-01-17
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Granted: 1966-12-27
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Expires: 1984-01-17
Abstract
No abstract record available.
Inventors
- 👤 Austin L Bullock
- 👤 Sidney L Vail
- 👤 Charles H Mack
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:19
CPC Classifications
D; D06; D06M; D06M13/00; D06M13/10; D06M13/184; D06M13/203
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
67 words
A PROCESS FOR CROSSLINKING CELLULOSE WHICH COMPRISES (A) IMPREGNATING THE SAID CELLULOSE WITH A FREE UNSATURATED ALIPHATIC CARBOXYLIC ACID SELECTED FROM THE GROUP CONSISTING OF PROPIOLIC ACID, AND ACETYLENE DICARBOXYLIC ACID, (B) DRAINING THE EXCESS ACID FROM THE IMPREGNATED CELLULOSE, (C) FURTHER IMPREGNATING THE ACID-IMPREGNATED-ANDDRAINED CELLULOSE WITH AQUEOUS SODIUM HYDROXIDE, (D) HEAT-CURING THE DOUBLY IMPREGNATED CELLULOSE, AND (E) WASHING THE HEAT-CURED CELLULOSE FREE FROM THE IMPREGNATING AGENTS.
Claim 2
Dependent Claim
67 words
A PROCESS FOR CROSSLINKING CELLULOSE WHICH COMPRISES (A) IMPREGNATING THE SAID CELLULOSE WITH A FREE UNSATURATED ALIPHATIC CARBOXYLIC ACID SELECTED FROM THE GROUP CONSISTING OF PROPIOLIC ACID, AND ACETYLENE DICARBOXYLIC ACID, (B) DRAINING THE EXCESS ACID FROM THE IMPREGNATED CELLULOSE, (C) FURTHER IMPREGNATING THE ACID-IMPREGNATED-ANDDRAINED CELLULOSE WITH AQUEOUS SODIUM HYDROXIDE, (D) HEAT-CURING THE DOUBLY IMPREGNATED CELLULOSE, AND (E) WASHING THE HEAT-CURED CELLULOSE FREE FROM THE IMPREGNATING AGENTS.
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) | 1969-12-26 | 1970-06-27 | 1970-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-12-26 | 1974-06-27 | 1974-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-12-26 | 1978-06-27 | 1978-12-27 | $7700.00 | Window Closed / Lapsed |