Patent US3682876A successfully refreshed from Google Patents.
US3682876A
Expired / Lapsed
US
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Polyperfluorocyclobutadiene
Assignee: Dow Chemical Co
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Filing: 1969-10-24
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Granted: 1972-08-08
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Expires: 1989-10-24
Abstract
Abstract DISCLOSED ARE HALOGEN TERMINATED POLYPERFLUOROCYCLOBUTADIENES CHARACTERIZED BY THE FORMULA: X-(CF<(-CF=CF-CF(-)-))N-X WHEREIN X IS HALOGEN AND N IS A NUMBER OF GREATER THAN 1. THE POLYMER IS PREPARED BY CONTACTING A PERFLUORO-3,4DIHALOCYCLOBUTENE, IN WHICH AT LEAST ONE OF THE HALOGENS IN THE 3,4-POSITION IS BROMINE OR IODINE WITH MERCURY, IN THE PRESENCE OF RADIATION OF SUFFICIENT ENERGY TO ACTIVATE THE C-I OR C-BR BOND AND CAUSE COUPLING WITH ANOTHER ACTIVATED SPECIES.
Inventors
- 👤 Richard W Anderson
- 👤 Hughie R Frick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 12:00
CPC Classifications
C; C08; C08G; C08G61/00; C08G61/02; C08G61/04; C08G61/06; C08G61/08; C07; C07C; C07C17/00; C07C17/26; C07C17/263; C07C17/269; C07C23/00; C07C23/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-08-08 | 1976-02-07 | 1976-08-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-08-08 | 1980-02-07 | 1980-08-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-08-08 | 1984-02-07 | 1984-08-08 | $7700.00 | Window Closed / Lapsed |