US2591077A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of producing a thermoplastic cellulose acetate composition
Assignee: Hercules Powder Co
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Filing: 1951-04-12
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Granted: 1952-04-01
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Expires: 1971-04-12
Abstract
No abstract record available.
Inventors
- 👤 Bayard T Lamborn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 06:40
CPC Classifications
C; C08; C08L; C08L1/00; C08L1/08; C08L1/10; C08L1/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
97 words
THE METHOD OF PRODUCING A THERMOPLASTIC CELLULOSE ACETATE COMPOSITION CONTAINING CELLULOSE TRIACTATE IN AN AMOUNT WITHIN THE RANGE OF ABOUT 10 TO 50% WHICH COMPRISES KNEADING SECONDARY CELLULOSE ACETATE PLASTICIZED WITH ABOUT 20% TO ABOUT 30% PLASTICIZER THEREFOR AT AN ELEVATED TEMPERATURE BELOW THE TEMPERATURE OF DECOMPOSITION THEREOF WHILE GRADUALLY ADDING THERETO PARTICLES OF CELLULOSE TRIACETATE, SAID PARTICLES BEING PERMEATED WITH PLASTICIZER IN CONCENTRATION VARYING FROM AT LEAST ABOUT 45% AT THE SURFACE THEREOF TO ABOUT 15 TO 20% AT THE GREATEST DISTANCE FROM THE SURFACE, AND CONTINUING KNEADING UNTIL A UNIFORMLY COLLOIDED PLASTIC MASS IS OBTAINED.
Claim 2
Independent Claim
97 words
THE METHOD OF PRODUCING A THERMOPLASTIC CELLULOSE ACETATE COMPOSITION CONTAINING CELLULOSE TRIACTATE IN AN AMOUNT WITHIN THE RANGE OF ABOUT 10 TO 50% WHICH COMPRISES KNEADING SECONDARY CELLULOSE ACETATE PLASTICIZED WITH ABOUT 20% TO ABOUT 30% PLASTICIZER THEREFOR AT AN ELEVATED TEMPERATURE BELOW THE TEMPERATURE OF DECOMPOSITION THEREOF WHILE GRADUALLY ADDING THERETO PARTICLES OF CELLULOSE TRIACETATE, SAID PARTICLES BEING PERMEATED WITH PLASTICIZER IN CONCENTRATION VARYING FROM AT LEAST ABOUT 45% AT THE SURFACE THEREOF TO ABOUT 15 TO 20% AT THE GREATEST DISTANCE FROM THE SURFACE, AND CONTINUING KNEADING UNTIL A UNIFORMLY COLLOIDED PLASTIC MASS IS OBTAINED.
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) | 1955-04-01 | 1955-10-01 | 1956-04-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1959-04-01 | 1959-10-01 | 1960-04-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1963-04-01 | 1963-10-01 | 1964-04-01 | $7700.00 | Window Closed / Lapsed |