Patent US2469772A successfully refreshed from Google Patents.
US2469772A
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Casing head
Assignee: Baash Ross Tool Co
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Filing: 1943-12-22
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Granted: 1949-05-10
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Expires: 1963-12-22
Abstract
No abstract record available.
Inventors
- 👤 Glenn D Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:16
CPC Classifications
E; E21; E21B; E21B33/00; E21B33/02; E21B33/03; E21B33/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US878067A
Cited
US1938062A
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US2142149A
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US2189575A
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US2074923A
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US2178549A
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US2228555A
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US2291143A
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US2237683A
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US2350867A
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US2312476A
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US2284983A
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US2313169A
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US2306102A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-05-09 | 1952-11-08 | 1953-05-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-05-09 | 1956-11-08 | 1957-05-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-05-09 | 1960-11-08 | 1961-05-10 | $7700.00 | Window Closed / Lapsed |