US2638924A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic tank valve
Assignee: Phillips Petroleum Co
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Filing: 1949-11-28
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Granted: 1953-05-19
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Expires: 1969-11-28
Abstract
No abstract record available.
Inventors
- 👤 Clair Theodore A St
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 01:47
CPC Classifications
F; F17; F17C; F17C13/00; F17C13/04; F16; F16K; F16K17/00; F16K17/20; F16K17/34; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7723; Y10T137/7724; Y10T137/7729; Y10T137/7758; Y10T137/7762; Y10T137/7769; Y10T137/8593; Y10T137/85978; Y10T137/86171; Y10T137/86292; Y10T137/8634; Y10T137/8811
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-18 | 1956-11-17 | 1957-05-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-18 | 1960-11-17 | 1961-05-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-18 | 1964-11-17 | 1965-05-19 | $7700.00 | Window Closed / Lapsed |