US2933536A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Inhibited pyrolysis of fluorocarbon polymers
Assignee: Individual
•
Filing: 1957-02-28
•
Granted: 1960-04-19
•
Expires: 1977-02-28
Abstract
No abstract record available.
Inventors
- 👤 Leo A Wall
- 👤 John D Michaelsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:14
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
63 words
THE METHOD OF CONVERTILNG NORMALLY SOLID POLYTETRAFLUOROETHYLENE TO AN INTERMEDIATE POLYTETRAFLUOROETHYLENE OF DESIRED VISCOSITY LESS THAN THAT OF THE SOLID WITHOUT SUBSTANTIAL LOSS IN WEIGHT BY INHIBITING THE PYROLYSIS OF SAID SOLID POLYTETRAFLUOROETHYLENE COMPRISING HEATING SAID POLYTETRAFLUOROETHYLENE IN AN ATMOSPHERE CONSISTING OF A GAS SELECTED FROM THE GROUP CONSISTING OF IF5 AND CIF3 AT A TEMPERATURE RANGE OF FROM 450* TO 480* C.
Claim 2
Independent Claim
63 words
THE METHOD OF CONVERTILNG NORMALLY SOLID POLYTETRAFLUOROETHYLENE TO AN INTERMEDIATE POLYTETRAFLUOROETHYLENE OF DESIRED VISCOSITY LESS THAN THAT OF THE SOLID WITHOUT SUBSTANTIAL LOSS IN WEIGHT BY INHIBITING THE PYROLYSIS OF SAID SOLID POLYTETRAFLUOROETHYLENE COMPRISING HEATING SAID POLYTETRAFLUOROETHYLENE IN AN ATMOSPHERE CONSISTING OF A GAS SELECTED FROM THE GROUP CONSISTING OF IF5 AND CIF3 AT A TEMPERATURE RANGE OF FROM 450* TO 480* C.
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) | 1963-04-19 | 1963-10-19 | 1964-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-04-19 | 1967-10-19 | 1968-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-04-19 | 1971-10-19 | 1972-04-19 | $7700.00 | Window Closed / Lapsed |