US3491844A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drag type core drill for pavement or rock having disparate inclusions
Assignee: Hughes Tool Co
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Filing: 1967-03-20
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Granted: 1970-01-27
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Expires: 1987-03-20
Abstract
No abstract record available.
Inventors
- 👤 Joseph L Kelly Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:13
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/62; E01; E01C; E01C23/00; E01C23/06; E01C23/09; E01C23/0906; E01C23/0926; E01C23/0933; E01C23/094; E21B10/02; E21B19/00; E21B19/08; E21B19/086
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US890012A
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US1114497A
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US1041568A
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US1271396A
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US1663025A
Cited
US2649284A
Cited
US2756025A
Cited
US2856157A
Cited
US2918260A
Cited
US3118511A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-26 | 1973-07-28 | 1974-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-26 | 1977-07-28 | 1978-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-26 | 1981-07-28 | 1982-01-27 | $7700.00 | Window Closed / Lapsed |