Patent US3643658A successfully refreshed from Google Patents.
Patent US3347391A successfully refreshed from Google Patents.
US3347391A
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US
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Filter cartridge and method of making the same
Assignee: Owens Corning
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Filing: 1964-10-29
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Granted: 1967-10-17
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Expires: 1984-10-29
Abstract
No abstract record available.
Inventors
- 👤 Robert N Steensen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:17
CPC Classifications
B; B01; B01D; B01D39/00; B01D39/14; B01D39/20; B01D39/2003; B01D39/2017; B01D39/2024; B01D29/00; B01D29/11; B01D29/111; B01D2101/00; B01D2101/005; B01D2201/00; B01D2201/18; B01D2201/188
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
88 words
A FILTER CARTRIDGE COMPRISING A HOLLOW CYLINDRICAL BODY OF A RESIN IMPREGNATED FIBROUS MATERIAL, SAID RESIN IN SAID BODY BEING UNIFORMLY DISTRIBUTED THROUGHOUT SAID BODY, AXIALLY SPACED APART, RADIALLY EXTENDING CIRCUMFERENTIAL LANDS ON THE OUTER SURFACE OF SAID BODY SEPARATED FROM ONE ANOTHER BY GROOVES THEREBETWEEN, AND A POROUS RESIN LAYER ON SAID OUTER SURFACE OF A DENSITY GREATER THAN SAID RESIN IN SAID BODY, SAID POROUS LAYER EXTENDING OVER SAID OUTER SURFACE AND THE FACES OF SAID LANDS AND GROOVES IN SAID OUTER SURFACE OF SAID BODY.
Claim 2
Independent Claim
76 words
A METHOD OF PRODUCING A FILTER CARTRIDGE OF A RESIN IMPREGNATED FIBROUS MATERIAL HAVING SHAPED CONVOLUTIONS ON AT LEAST ONE EXPOSED SURFACE THEREOF, SAID METHOD COMPRISING THE STEPS OF (1) FORMING FILTER BODY OF A FIBROUS MATERIAL IMPREGNATED WITH CURABLE RESIN, (2) CURING THE RESIN IN SAID FILTER BODY, (3) FORMING SAID SHAPED CONVOLUTIONS ON SAID EXPOSED SURFACE OF SAID FILTER BODY, (4) IMMERSING THE BODY IN A RESIN BATH, AND (5) POST-CURING SAID FILTER BODY.
References Cited (Backward Citations)
US2217085A
Cited
US2395301A
Cited
GB572899A
Cited
FR927593A
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US2539768A
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US2681599A
Cited
US2768754A
Cited
US2781913A
Cited
US3096230A
Cited
US3156648A
Cited
US3261473A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-10-16 | 1971-04-17 | 1971-10-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-10-16 | 1975-04-17 | 1975-10-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-10-16 | 1979-04-17 | 1979-10-17 | $7700.00 | Window Closed / Lapsed |