US3040027A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of cellulose esters
Assignee: Acordis UK Ltd
•
Filing: 1957-08-09
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Granted: 1962-06-19
•
Expires: 1977-08-09
Abstract
No abstract record available.
Inventors
- 👤 Bates Harold
- 👤 Hindley Frank
- 👤 Popiolek Wladislas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:35
CPC Classifications
C; C08; C08B; C08B3/00; C08B3/08; C08B17/00; C08B17/02; C08B3/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
83 words
PROCESS FOR THE MANUFACTURE OF CELLULOSE ESTERS ON A CONTINUOUS BASIS, WHICH COMPRISES CAUSING A MIXTURE COMPRISING INITIALLY CELLULOSE, AN ORGANIC ACID ANHYDRIDE, A SOLVENT FOR THE CELLULOSE ESTER TO BE MADE, AND AN ESTERIFICATION CATALYST TO PASS THROUGH A TUBULAR ESTERIFICATION ZONE, AND IN THE COURSE OF ITS TRAVEL THROUGH THE SAID ZONE SUCCESSIVELY OBSTRUCTING PARTICLES OF 16-24 MESH SIZE, 48-72 MESH SIZE AND 80-120 MESH SIZE, SAID PARTICLES COMPRISING UNESTERIFIED AND PARTLY ESTERIFIED FIBERS AND INSOLUBLE IMPURITIES WHICH MAY BE PRESENT.
Claim 2
Dependent Claim
83 words
PROCESS FOR THE MANUFACTURE OF CELLULOSE ESTERS ON A CONTINUOUS BASIS, WHICH COMPRISES CAUSING A MIXTURE COMPRISING INITIALLY CELLULOSE, AN ORGANIC ACID ANHYDRIDE, A SOLVENT FOR THE CELLULOSE ESTER TO BE MADE, AND AN ESTERIFICATION CATALYST TO PASS THROUGH A TUBULAR ESTERIFICATION ZONE, AND IN THE COURSE OF ITS TRAVEL THROUGH THE SAID ZONE SUCCESSIVELY OBSTRUCTING PARTICLES OF 16-24 MESH SIZE, 48-72 MESH SIZE AND 80-120 MESH SIZE, SAID PARTICLES COMPRISING UNESTERIFIED AND PARTLY ESTERIFIED FIBERS AND INSOLUBLE IMPURITIES WHICH MAY BE PRESENT.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-06-18 | 1965-12-18 | 1966-06-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-06-18 | 1969-12-18 | 1970-06-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-06-18 | 1973-12-18 | 1974-06-19 | $7700.00 | Window Closed / Lapsed |