US2661189A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centralizer
Assignee: Independent Pneumatic Tool Co
•
Filing: 1951-09-29
•
Granted: 1953-12-01
•
Expires: 1971-09-29
Abstract
No abstract record available.
Inventors
- 👤 Hilmer A Gillerstrom
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:24
CPC Classifications
E; E21; E21B; E21B19/00; E21B19/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2055520A
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US2108035A
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US2244127A
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US2308203A
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US2274698A
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US2357001A
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US2365686A
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US2523512A
Cited
US2540574A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-11-30 | 1957-06-01 | 1957-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-11-30 | 1961-06-01 | 1961-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-11-30 | 1965-06-01 | 1965-12-01 | $7700.00 | Window Closed / Lapsed |