Patent US3230020A successfully refreshed from Google Patents.
US3230020A
Expired / Lapsed
US
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Lubricator for drill bit
Assignee: Reed Roller Bit Co
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Filing: 1963-07-18
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Granted: 1966-01-18
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Expires: 1983-07-18
Abstract
No abstract record available.
Inventors
- 👤 George J Gilbert
- 👤 Jr Percy W Schumacher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:20
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/22; E21B10/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-17 | 1969-07-19 | 1970-01-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-17 | 1973-07-19 | 1974-01-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-17 | 1977-07-19 | 1978-01-18 | $7700.00 | Window Closed / Lapsed |