Patent US2851449A successfully refreshed from Google Patents.
US2851449A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Copolymers of trifluoroethyl vinyl ether and vinyl esters
Assignee: Airco Inc
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Filing: 1955-06-10
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Granted: 1958-09-09
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Expires: 1975-06-10
Abstract
No abstract record available.
Inventors
- 👤 Calvin E Schildknecht
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:25
CPC Classifications
C; C08; C08F; C08F218/00; C08F218/02; C08F218/04; C08F16/00; C08F16/12; C08F16/14; C08F16/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
38 words
A BINARY COPOLYMER CONTAINING FROM 5 TO 50 PERCENT BY WEIGHT OF SAID COPOLYMER OF 2,2,2-TRIFLUOROETHYL VINYL ETHER AND FROM 95 TO 50 PERCENT BY WEIGHT OF SAID COPOLYMER OF A VINYL ESTER OF A CARBOXYLIC ACID FORMULA
Claim 2
Dependent Claim
38 words
A BINARY COPOLYMER CONTAINING FROM 5 TO 50 PERCENT BY WEIGHT OF SAID COPOLYMER OF 2,2,2-TRIFLUOROETHYL VINYL ETHER AND FROM 95 TO 50 PERCENT BY WEIGHT OF SAID COPOLYMER OF A VINYL ESTER OF A CARBOXYLIC ACID FORMULA
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) | 1961-09-08 | 1962-03-10 | 1962-09-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-09-08 | 1966-03-10 | 1966-09-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-09-08 | 1970-03-10 | 1970-09-09 | $7700.00 | Window Closed / Lapsed |