Patent US2970458A successfully refreshed from Google Patents.
US2970458A
Expired / Lapsed
US
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Kelly drive bushing
Assignee: Dresser Industries Inc
•
Filing: 1957-05-01
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Granted: 1961-02-07
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Expires: 1977-05-01
Abstract
No abstract record available.
Inventors
- 👤 Archie R Mclerran
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 06:13
CPC Classifications
E; E21; E21B; E21B3/00; E21B3/02; E21B3/04
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US672613A
Cited
US2023796A
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US2171176A
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US2140659A
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US2179645A
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US2337795A
Cited
US2597516A
Cited
US2707093A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-02-07 | 1964-08-08 | 1965-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-02-07 | 1968-08-08 | 1969-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-02-07 | 1972-08-08 | 1973-02-07 | $7700.00 | Window Closed / Lapsed |