US2456621A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of extruding polytetrafluoroethylene and coating articles therewith
Assignee: EIDP Inc
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Filing: 1946-08-17
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Granted: 1948-12-21
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Expires: 1966-08-17
Abstract
No abstract record available.
Inventors
- 👤 Jr Azro Jack Cheney
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 17:48
CPC Classifications
B; B29; B29C; B29C43/00; B29C43/003; B29C48/00; B29C48/022; B29C48/03; B29C48/04; B29C48/05; B29C48/06; B29C48/09; B29C48/10; B29C48/15; B29C48/151; B29K; B29K2027/00; B29K2027/12; B29K2027/18; B29K2105/00; B29K2105/25; B29K2105/251
Claims Analysis
Total Claims: 0
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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) | 1951-12-21 | 1952-06-21 | 1952-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-12-21 | 1956-06-21 | 1956-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-12-21 | 1960-06-21 | 1960-12-21 | $7700.00 | Window Closed / Lapsed |