Patent US3267960A successfully refreshed from Google Patents.
US3267960A
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US
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Automatic drain valve
Assignee: Thompson Manufacturing Co
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Filing: 1963-08-19
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Granted: 1966-08-23
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Expires: 1983-08-19
Abstract
No abstract record available.
Inventors
- 👤 Leslie B Warburton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 04:51
CPC Classifications
B; B05; B05B; B05B1/00; B05B1/30; B05B1/3006; B05B1/14; B05B1/1421; B05B1/1423; B05B1/1424; F; F16; F16K; F16K15/00; F16K15/14; F16K15/144; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7837; Y10T137/7869
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
99 words
AS AN ARTICLE OF MANUFACTURE, A DRAIN VALVE UNIT, COMPRISING: (A) A HOLLOW CYLINDRICAL SCREW PLUG BODY HAVING AN EXTERNALLY THREADED INNER END; (B) AN INTERIOR TRANSVERSE BAFFLE WALL ADJACENT SAID INNER END HAVING A CENTRAL BORE OF REDUCED DIAMETER COMMUNICATING AT SAID INNER END WITH A SURROUNDING ANNULAR SEATING SURFACE, THE OTHER END OF SAID BORE BEING OPEN TO ATMOSPHERE; (C) A RELATIVELY FLAT DIAPHRAGM DISC OF RESILIENT MATERIAL EXTENDING OVER SAID ANNULAR SEATING SURFACE; (D) A PLURALITY OF INTEGRAL SPACED APART RADIALLY EXTENDING LOBES AT THE DISC PERIPHERY PROVIDING PASSAGES THEREBETWEEN FOR LOW PRESSURE FLUID FLOW IN-
References Cited (Backward Citations)
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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) | 1969-08-22 | 1970-02-21 | 1970-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-08-22 | 1974-02-21 | 1974-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-08-22 | 1978-02-21 | 1978-08-23 | $7700.00 | Window Closed / Lapsed |