US2564873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic electromagnetic drain valve
Assignee: Individual
•
Filing: 1945-02-14
•
Granted: 1951-08-21
•
Expires: 1965-02-14
Abstract
No abstract record available.
Inventors
- 👤 Evan H Wright
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 06:48
CPC Classifications
F; F16; F16T; F16T1/00; Y; Y10; Y10T; Y10T137/00; Y10T137/2931; Y10T137/3003; Y10T137/3021; Y10T137/304; Y10T137/3052; Y10T137/6416; Y10T137/6606; Y10T137/7287; Y10T137/7306
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US257069A
Cited
US407656A
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US691569A
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US1105397A
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US1538092A
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US1531007A
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US1651865A
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US1722160A
Cited
DE677819C
Cited
US2279243A
Cited
US2330290A
Cited
US2413655A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-08-20 | 1955-02-19 | 1955-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-08-20 | 1959-02-19 | 1959-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-08-20 | 1963-02-19 | 1963-08-21 | $7700.00 | Window Closed / Lapsed |