Patent US2637333A successfully refreshed from Google Patents.
US2637333A
Expired / Lapsed
US
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Emergency valve
Assignee: Phillips Petroleum Co
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Filing: 1948-09-09
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Granted: 1953-05-05
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Expires: 1968-09-09
Abstract
No abstract record available.
Inventors
- 👤 Jr William L Houston
- 👤 Marshall F Rawlings
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:49
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/36; F16K17/38; F16K17/383; Y; Y10; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1632; Y10T137/1639; Y10T137/1774; Y10T137/1797; Y10T137/1819; Y10T137/8811
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US423608A
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US842393A
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US1076647A
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US1886454A
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US1834645A
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US1924417A
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US2079164A
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US2115371A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-05-04 | 1956-11-03 | 1957-05-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-05-04 | 1960-11-03 | 1961-05-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-05-04 | 1964-11-03 | 1965-05-05 | $7700.00 | Window Closed / Lapsed |