US3495668A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill bit
Assignee: GW Murphy Industries Inc
•
Filing: 1968-07-05
•
Granted: 1970-02-17
•
Expires: 1988-07-05
Abstract
No abstract record available.
Inventors
- 👤 Percy W Schumacher Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:49
CPC Classifications
E; E21; E21B; E21B10/00; E21B10/46; E21B10/50; E21B10/52; E21B10/08; E21B10/16
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2148372A
Cited
US3137355A
Cited
US3223188A
Cited
US3388756A
Cited
US3389761A
Cited
US3388757A
Cited
US3442342A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-02-16 | 1973-08-18 | 1974-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-02-16 | 1977-08-18 | 1978-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-02-16 | 1981-08-18 | 1982-02-17 | $7700.00 | Window Closed / Lapsed |