US3480094A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill collar for protecting drill string
Assignee: Individual
•
Filing: 1968-03-21
•
Granted: 1969-11-25
•
Expires: 1988-03-21
Abstract
No abstract record available.
Inventors
- 👤 James B N Morris
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:19
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1042
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US3103391A
Cited
US2651199A
Cited
US2690934A
Cited
US2863704A
Cited
US3054647A
Cited
US3148004A
Cited
US3268274A
Cited
US3320004A
Cited
US3343890A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-24 | 1973-05-26 | 1973-11-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-24 | 1977-05-26 | 1977-11-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-24 | 1981-05-26 | 1981-11-25 | $7700.00 | Window Closed / Lapsed |