Patent US2944608A successfully refreshed from Google Patents.
US2944608A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centralizing spider for wells
Assignee: Robbins and Myers Inc
•
Filing: 1958-03-25
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Granted: 1960-07-12
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Expires: 1978-03-25
Abstract
No abstract record available.
Inventors
- 👤 Robert M Rush
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:55
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1014; E21B17/1021; E21B17/1028
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US350655A
Cited
US1293777A
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US2451762A
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US2611664A
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US2550964A
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US2813697A
Cited
US2765854A
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US2807955A
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US2781100A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-07-12 | 1964-01-11 | 1964-07-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-07-12 | 1968-01-11 | 1968-07-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-07-12 | 1972-01-11 | 1972-07-12 | $7700.00 | Window Closed / Lapsed |