Patent US3578721A successfully refreshed from Google Patents.
US3578721A
Expired / Lapsed
US
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Process for reducing the formation of polymer attendant the pyrolysis of tetrafluoroethylene
Assignee: EIDP Inc
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Filing: 1967-12-14
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Granted: 1971-05-11
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Expires: 1987-12-14
Abstract
Abstract THE PYROLYSIS OF TETRAFLUOROETHYLENE TO HIGHER MOLECULAR WEIGHT PERFLUOROCARBON COMPOUNDS, E.G., HEXAFLUOROPROPYLENE, IS ACCOMPANIED BY POLYMER FORMATION WHICH, ACCORDING TO THE PRESENT INVENTION, IS SUPPRESSED BY INTIMATELY CONTACTING THE PYROLYZATE BEFORE IT COOLS SUFFICIENTLY FOR POLYMERIZATION TO OCCUR WITH SUCH COMPOUNDS AS HC1, HF, KF OR NAF.
Inventors
- 👤 Maurice Joseph Couture
- 👤 Hans M B Gerner
- 👤 Hugh H Gibbs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:18
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/26
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) | 1974-05-10 | 1974-11-09 | 1975-05-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-10 | 1978-11-09 | 1979-05-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-10 | 1982-11-09 | 1983-05-11 | $7700.00 | Window Closed / Lapsed |