Patent US3592769A successfully refreshed from Google Patents.
US3592769A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Grooved replaceable filter tube
Assignee: Johns Manville Corp
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Filing: 1970-02-16
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Granted: 1971-07-13
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Expires: 1990-02-16
Abstract
Abstract A GLASS FIBER FILTER HAVING A PLUALITY OF GROOVES OF NONUNIFORM RADIAL DEPTH EXTENDING FROM ONE CYLINDRICAL SURFACE TOWARD BUT NO THROUGH THE OTHER CYLINDRICAL SURFACE OF THE TUBE IS DISCLOSED HEREIN. THE BOTTOM WALLS OF THE GROOVE MAY BE STRAIGHT OR ARCUATE AND THEIR ENDS MAY BE ARRANGED IN LONGITUDINALLY EXTENDING ROWS SEPARATED BY IMPERFORATE PORTIONS OF ONE TUBE WALL SURFACE, AND EACH ROW CONTAINS A PLURALITY OF SUCH GROOVES SEPARATED BY LANDS. THE FILTER IS A REPLACEABLE UNIT USEFUL FOR REMOVING SOLIDS AND IMMISCIBLE LIQUIDS FROM A FLUID STREAM. D R A W I N G
Inventors
- 👤 Milton Richard Decker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 05:05
CPC Classifications
C; C10; C10G; C10G31/00; C10G31/09; B; B01; B01D; B01D29/00; B01D29/11; B01D29/111; B01D29/31; B01D29/33; B01D2101/00; B01D2101/005
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-07-12 | 1975-01-11 | 1975-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-07-12 | 1979-01-11 | 1979-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-07-12 | 1983-01-11 | 1983-07-13 | $7700.00 | Window Closed / Lapsed |