US2440190A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Preparation of nonporous polytetrafluoroethylene articles
Assignee: EIDP Inc
•
Filing: 1944-03-01
•
Granted: 1948-04-20
•
Expires: 1964-03-01
Abstract
No abstract record available.
Inventors
- 👤 Alfthan Johannes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 16:29
CPC Classifications
C; C08; C08J; C08J5/00; C08J5/18; B; B29; B29C; B29C67/00; B29C67/24; B29C39/00; B29C43/00; B29C67/02; B29C67/04; B29K; B29K2027/00; B29K2027/12; B29K2027/18; B29L; B29L2007/00; B29L2007/008; C08J2327/00; C08J2327/02; C08J2327/12; C08J2327/18
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2392389A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-20 | 1951-10-20 | 1952-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-20 | 1955-10-20 | 1956-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-20 | 1959-10-20 | 1960-04-20 | $7700.00 | Window Closed / Lapsed |