US3223739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polymerization of tetrafluoroethylene and preparation of fluorocarbon waxes
Assignee: Individual
•
Filing: 1963-08-02
•
Granted: 1965-12-14
•
Expires: 1983-08-02
Abstract
No abstract record available.
Inventors
- 👤 Fred N Teumac
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 23:53
CPC Classifications
C; C10; C10M; C10M1/00; C10M1/08; C08; C08F; C08F14/00; C08F14/18; C08F14/26; C10M2211/00; C10M2211/06; C10M2213/00; C10M2213/02; C10M2213/06; C10M2213/062; C10N; C10N2050/00; C10N2050/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
25 words
A PROCESS FOR POLYMERIZING TETRAFLUOROETHYLENE WHICH COMPRISES CONTACTING VAPORS OF MONOMERIC TETRAFLUOROETHYLENE WITH CESIUM FLUORIDE AT TEMPERATURES BETWEEN ABOUT 140* AND 300*C. AND SUPERATMOSPHERIC PRESSURE.
Claim 2
Dependent Claim
25 words
A PROCESS FOR POLYMERIZING TETRAFLUOROETHYLENE WHICH COMPRISES CONTACTING VAPORS OF MONOMERIC TETRAFLUOROETHYLENE WITH CESIUM FLUORIDE AT TEMPERATURES BETWEEN ABOUT 140* AND 300*C. AND SUPERATMOSPHERIC PRESSURE.
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) | 1968-12-13 | 1969-06-14 | 1969-12-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-13 | 1973-06-14 | 1973-12-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-13 | 1977-06-14 | 1977-12-14 | $7700.00 | Window Closed / Lapsed |