US2813848A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers of 1-chloro-2, 2-difluoro ethylene and 2, 2, 2-trifluoroethyl vinyl ether
Assignee: Pennwalt Corp
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Filing: 1955-09-28
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Granted: 1957-11-19
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Expires: 1975-09-28
Abstract
No abstract record available.
Inventors
- 👤 John T Barr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:46
CPC Classifications
C; C08; C08F; C08F218/00; C08F218/02; C08F218/04; C08F218/08; C08F16/00; C08F16/12; C08F16/14; C08F16/24
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
77 words
A PROCESS FOR PREPARING A NEW POLYMERIC PRODUCT WHICH COMPRISES HEATING IN THE TEMPERATURE RANGE FROM 0* TO ABOUT 122*C. A MIXTURE CONTAINING FROM ABOUT 20 TO ABOUT 79 PARTS BY WEIGHT OF 1-CHLORO-2,2-DIFLUOROETHYLENE AND FROM ABOUT 25 TO ABOUT 101 PARTS OF 2,2,2-TRIFLUOROETHYL VINYL ETHER IN CONTACT WITH 0.1 TO ABOUT 0.25 PART OF A FREE-RADICAL POLYMERIZATION INITIATOR, ABOUT 115 TO ABOUT 240 PARTS OF WATER, AND ABOUT 0.1 TO ABOUT 18 PARTS OF EMULSIFYING AGENT.
References Cited (Backward Citations)
US2479367A
Cited
US2631975A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-11-18 | 1961-05-20 | 1961-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-18 | 1965-05-20 | 1965-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-18 | 1969-05-20 | 1969-11-19 | $7700.00 | Window Closed / Lapsed |