US2496978A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Polytetrafluoroethylene waxes having a sharp melting point
Assignee: EIDP Inc
•
Filing: 1946-06-10
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Granted: 1950-02-07
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Expires: 1966-06-10
Abstract
No abstract record available.
Inventors
- 👤 Kenneth L Berry
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:09
CPC Classifications
C; C08; C08F; C08F8/00; C08F8/50; Y; Y10; Y10T; Y10T428/00; Y10T428/31504; Y10T428/3154; Y10T428/31544; Y10T428/31652; Y10T428/31667
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
32 words
A NORMALLY HARD, FRIABLE POLYTETRAFLUOROETHYLENE WAX CONSISTING OF PYROLYZED TETRAFLUOROETHYLENE POLYMERS SHOWING ON X-RAY DIFFRACTION THE CHARACTERISTIC PATTERN OF A MICROCRYSTALLINE STRUCTURE AND HAVING A SHARP MELTING POINT BETWEEN 320* AND 327*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) | 1953-02-06 | 1953-08-08 | 1954-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-02-06 | 1957-08-08 | 1958-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-02-06 | 1961-08-08 | 1962-02-07 | $7700.00 | Window Closed / Lapsed |