Patent US3398837A successfully refreshed from Google Patents.
US3398837A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Impregnated self-supporting honeycombed filter cartridge
Assignee: Commercial Filters Corp
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Filing: 1964-12-03
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Granted: 1968-08-27
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Expires: 1984-12-03
Abstract
No abstract record available.
Inventors
- 👤 Edward R Adams
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 17:39
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/16; B01D39/1607; B01D39/1615; B01D29/00; B01D29/11; B01D29/111; B01D29/13; B01D29/15; B01D29/21; B01D29/216; B01D39/1623; B01D39/18; B01D2239/00; B01D2239/04; B01D2239/0414; B01D2239/0428; B01D2239/0464; B01D2239/06; B01D2239/065; B01D2239/069; B01D2239/0695
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
35 words
A MECHANICALLY SELF-SUSTAINING POROUS TUBULAR FILTER ELEMENT HAVING: NAPPED YARN WOUND BACK AND FORTH IN SPACED CRISS-CROSS FASHION INTO A HONEYCOMB TUBE AND PROVIDING A TUNNELED WALL OR SUBSTANTIAL THICKNESS ABOUT AN UNRESTRICTED AXIAL BORE;
Claim 2
Dependent Claim
35 words
A MECHANICALLY SELF-SUSTAINING POROUS TUBULAR FILTER ELEMENT HAVING: NAPPED YARN WOUND BACK AND FORTH IN SPACED CRISS-CROSS FASHION INTO A HONEYCOMB TUBE AND PROVIDING A TUNNELED WALL OR SUBSTANTIAL THICKNESS ABOUT AN UNRESTRICTED AXIAL BORE;
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) | 1971-08-27 | 1972-02-26 | 1972-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-08-27 | 1976-02-26 | 1976-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-08-27 | 1980-02-26 | 1980-08-27 | $7700.00 | Window Closed / Lapsed |