Patent US2933154A successfully refreshed from Google Patents.
US2933154A
Expired / Lapsed
US
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Process for filtering with polytetrafluoroethylene fibers
Assignee: EIDP Inc
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Filing: 1957-07-31
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Granted: 1960-04-19
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Expires: 1977-07-31
Abstract
No abstract record available.
Inventors
- 👤 Lauterbach Herbert George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 19:46
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D39/1623; B01D39/08; B01D46/00; B01D2239/00; B01D2239/06; B01D2239/065; B01D2239/0654
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
25 words
A PROCESS FOR FILTERING PARTICLES SUSPENDED IN A GASEOUS MEDIUM WHICH COMPRISES PASSING SAID MEDIUM CONTAINING SAID PARTICLES THROUGH A NON-WOVEN SEPTUM OF POLYTETRAFLUOROETHYLENE FIBERS.
Claim 2
Dependent Claim
25 words
A PROCESS FOR FILTERING PARTICLES SUSPENDED IN A GASEOUS MEDIUM WHICH COMPRISES PASSING SAID MEDIUM CONTAINING SAID PARTICLES THROUGH A NON-WOVEN SEPTUM OF POLYTETRAFLUOROETHYLENE FIBERS.
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 |