US3588199A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Drill pipe protector
Assignee: Individual
•
Filing: 1969-08-11
•
Granted: 1971-06-28
•
Expires: 1989-08-11
Abstract
Abstract MY INVENTION IS A DRILL PIPE PROTECTOR COMPRISING A SPACING MEANS AND AN ATTACHING MEANS AND CHARACTERIZED BY A MEANS FOR INDUCING A COMPRESSIVE STRESS AT THE WEARING SURFACE TO CLOSE AND SEAL CUTS.
Inventors
- 👤 Arthur H Hopmans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 08:46
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)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-27 | 1974-12-27 | 1975-06-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-27 | 1978-12-27 | 1979-06-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-27 | 1982-12-27 | 1983-06-28 | $7700.00 | Window Closed / Lapsed |