Patent US2721058A successfully refreshed from Google Patents.
US2721058A
Expired / Lapsed
US
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Drill bit
Assignee: Reed Roller Bit Co
•
Filing: 1948-09-16
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Granted: 1955-10-18
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Expires: 1968-09-16
Abstract
No abstract record available.
Inventors
- 👤 Elvin G Boice
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 11:32
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/60; E21B10/61; E21B10/62
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US701101A
Cited
US712514A
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US1369544A
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US1589633A
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US2055144A
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US2017834A
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US2110783A
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US2100615A
Cited
US2252299A
Cited
US2408892A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-10-17 | 1959-04-18 | 1959-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-10-17 | 1963-04-18 | 1963-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-10-17 | 1967-04-18 | 1967-10-18 | $7700.00 | Window Closed / Lapsed |