Patent US2536727A successfully refreshed from Google Patents.
US2536727A
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US
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Method of making valves
Assignee: Weatherhead Co
•
Filing: 1946-10-11
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Granted: 1951-01-02
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Expires: 1966-10-11
Abstract
No abstract record available.
Inventors
- 👤 Charles H Crawley
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:36
CPC Classifications
F; F16; F16K; F16K27/00; F16K27/02; F16K27/0263; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49405; Y10T29/49412; Y10T29/49425
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1733421A
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US1674076A
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US1804624A
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US2209709A
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US2208394A
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US2323160A
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US2402889A
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US2402029A
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US2396956A
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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) | 1954-01-01 | 1954-07-03 | 1955-01-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-01-01 | 1958-07-03 | 1959-01-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-01-01 | 1962-07-03 | 1963-01-02 | $7700.00 | Window Closed / Lapsed |