US3389760A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rolling cutters for rock formations mounted on simple beam bearings
Assignee: Hughes Tool Co
•
Filing: 1966-09-01
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Granted: 1968-06-25
•
Expires: 1986-09-01
Abstract
No abstract record available.
Inventors
- 👤 Wilford V Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 04:03
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/08; E21B10/22; E21B10/10; E21B10/24
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1444074A
Cited
US2248340A
Cited
GB754983A
Cited
US2990025A
Cited
US3203492A
Cited
US3216513A
Cited
US3299973A
Cited
US3332505A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-25 | 1971-12-25 | 1972-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-25 | 1975-12-25 | 1976-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-25 | 1979-12-25 | 1980-06-25 | $7700.00 | Window Closed / Lapsed |