US2879173A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for preparing free-flowing pellets of polychloroprene and the resulting product
Assignee: EIDP Inc
•
Filing: 1956-03-06
•
Granted: 1959-03-24
•
Expires: 1976-03-06
Abstract
No abstract record available.
Inventors
- 👤 Yacoe Jesse Craig
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 23:16
CPC Classifications
C; C08; C08J; C08J3/00; C08J3/12; B; B29; B29B; B29B9/00; B29B9/16; C08C; C08C1/00; C08C1/14; C08C1/16; C08J2311/00; C08J2311/02; Y; Y10; Y10T; Y10T428/00; Y10T428/29; Y10T428/2982; Y10T428/2991; Y10T428/2998
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
98 words
A PROCESS FOR PREPARING FREE-FLOWING PELLETS OF PLASTIC POLYCHLOROPRENE, WHICH COMPRISES SUSPENDING DROPS OF AN AQUEOUS DISPERSION OF THE POLYCHLOROPRENE IN A VOLATILE, WATER-IMMISCIBLE ORGANIC LIQUID IN WHICH THE POLYMER IS INSOLUBLE AT TEMPERATURES BELOW - 20*C. UNTIL THE DROPS ARE COMPLETELY FROZEN AND THE POLYCHLOROPRENE COAGULATED, SEPARATING THE FROZEN PELLETS FROM THE SUSPENDING LIQUID COATING THEM WHILE STILL FROZEN WITH FROM 5% TO 20% OF THEIR DRY WEIGHT OF A POWDER WHICH DOES NOT REACT WITH THE POLYCHLOROPRENE UNDER NORMAL ATMOSPHERIC CONDITIONS, AND REMOVING THE WATER AND ANY ADHERING ORGANIC LIQUID BY VAPORIZATION BY WARMING THE PELLETS.
Claim 2
Dependent Claim
98 words
A PROCESS FOR PREPARING FREE-FLOWING PELLETS OF PLASTIC POLYCHLOROPRENE, WHICH COMPRISES SUSPENDING DROPS OF AN AQUEOUS DISPERSION OF THE POLYCHLOROPRENE IN A VOLATILE, WATER-IMMISCIBLE ORGANIC LIQUID IN WHICH THE POLYMER IS INSOLUBLE AT TEMPERATURES BELOW - 20*C. UNTIL THE DROPS ARE COMPLETELY FROZEN AND THE POLYCHLOROPRENE COAGULATED, SEPARATING THE FROZEN PELLETS FROM THE SUSPENDING LIQUID COATING THEM WHILE STILL FROZEN WITH FROM 5% TO 20% OF THEIR DRY WEIGHT OF A POWDER WHICH DOES NOT REACT WITH THE POLYCHLOROPRENE UNDER NORMAL ATMOSPHERIC CONDITIONS, AND REMOVING THE WATER AND ANY ADHERING ORGANIC LIQUID BY VAPORIZATION BY WARMING THE PELLETS.
References Cited (Backward Citations)
US1874546A
Cited
US2120549A
Cited
US2356896A
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US2419512A
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US2457962A
Cited
US2463679A
Cited
US2550503A
Cited
US2643234A
Cited
US2788297A
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US2670342A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-23 | 1962-09-22 | 1963-03-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-23 | 1966-09-22 | 1967-03-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-23 | 1970-09-22 | 1971-03-24 | $7700.00 | Window Closed / Lapsed |