US2447546A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic shutoff apparatus for oil wells
Assignee: Lane Wells Co
•
Filing: 1942-03-30
•
Granted: 1948-08-24
•
Expires: 1962-03-30
Abstract
No abstract record available.
Inventors
- 👤 Spencer Lloyd
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 03:26
CPC Classifications
E; E21; E21B; E21B34/00; E21B34/06; E21B34/08; E21B23/00; Y; Y10; Y10T; Y10T137/00; Y10T137/7722; Y10T137/7781; Y10T137/7784; Y10T137/7785
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB107434A
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US1715504A
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US1788368A
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US2122080A
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US2138719A
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US2188713A
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US2127849A
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US2196525A
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US2297044A
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US2288605A
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US2217986A
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US2378374A
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US2352612A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-08-24 | 1952-02-23 | 1952-08-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-08-24 | 1956-02-23 | 1956-08-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-08-24 | 1960-02-23 | 1960-08-24 | $7700.00 | Window Closed / Lapsed |