US2453891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure release
Assignee: Grant Oil Tool Co
•
Filing: 1945-01-08
•
Granted: 1948-11-16
•
Expires: 1965-01-08
Abstract
No abstract record available.
Inventors
- 👤 Clarence E Burt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 18:57
CPC Classifications
F; F16; F16K; F16K17/00; F16K17/02; F16K17/14; F16K17/16; F16K17/162; Y; Y10; Y10T; Y10T137/00; Y10T137/1624; Y10T137/1632; Y10T137/1692; Y10T137/1714
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US138171A
Cited
US568680A
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US776834A
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US1022301A
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US1248578A
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US1930960A
Cited
US1954285A
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US2001686A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-16 | 1952-05-17 | 1952-11-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-16 | 1956-05-17 | 1956-11-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-16 | 1960-05-17 | 1960-11-16 | $7700.00 | Window Closed / Lapsed |