US3037902A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Partial acetylation of cellulose
Assignee: Rayonier Inc
•
Filing: 1960-12-22
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Granted: 1962-06-05
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Expires: 1980-12-22
Abstract
No abstract record available.
Inventors
- 👤 Michael D Fahey
- 👤 Robert S Tabke
- 👤 Robert G Rickey
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:45
CPC Classifications
C; C08; C08B; C08B3/00; C08B3/06; C08B1/00; C08B1/02; D; D21; D21H; D21H11/00; D21H11/16; D21H11/20; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/582
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
64 words
THE PROCESS OF PRODUCING PARTIALLY ACETYLATED CELLULOSE FIBER WHICH COMPRISES MIXING TOGETHER CELLULOSE FIBER, SUFFICIENT ACETIC ACID TO SWELL THE FIBER AND AT LEAST A SUFFICIENT AMOUNT OF ACETIC ANHYDRIDE TO SATISFY THE ACETYL CONTENT OF FROM 10 TO 30%, HEATING THE MIXTURE UNDER ANHYDROUS CONDITIONS AT A TEMPERATURE OF FROM 220* TO 260*C. FOR FROM 1.5 TO 3 MINUTES AND WITHOUT A CATALYST.
References Cited (Backward Citations)
US2992156A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-06-04 | 1965-12-04 | 1966-06-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-04 | 1969-12-04 | 1970-06-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-04 | 1973-12-04 | 1974-06-05 | $7700.00 | Window Closed / Lapsed |