Patent US2533491A successfully refreshed from Google Patents.
US2533491A
Expired / Lapsed
US
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Valve control mechanism
Assignee: Individual
•
Filing: 1947-01-23
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Granted: 1950-12-12
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Expires: 1967-01-23
Abstract
No abstract record available.
Inventors
- 👤 Jerome B Mcmahon
- 👤 Thomas A Abbott
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 14:28
CPC Classifications
F; F16; F16K; F16K31/00; F16K31/02; F16K31/06; F16K31/08; F16K31/086; H; H01; H01F; H01F7/00; H01F7/02; Y; Y10; Y10T; Y10T137/00; Y10T137/8158; Y10T137/8225
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USRE20768E
Cited
US2100805A
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US2211664A
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US2241983A
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US2248030A
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US2307723A
Cited
US2289574A
Cited
US2346904A
Cited
US2371511A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-12-11 | 1954-06-12 | 1954-12-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-12-11 | 1958-06-12 | 1958-12-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-12-11 | 1962-06-12 | 1962-12-12 | $7700.00 | Window Closed / Lapsed |