US3193918A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of fabricating drill pipe
Assignee: Individual
•
Filing: 1962-01-08
•
Granted: 1965-07-13
•
Expires: 1982-01-08
Abstract
No abstract record available.
Inventors
- 👤 Russell C Heldenbrand
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:32
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/12; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49826; Y10T29/49863; Y10T29/49865; Y10T29/49893
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
A METHOD FOR APPLYING A PROTECTIVE SLEEVE DEVICE TO THE CENTER PORTION OF A JOINT OF DRILL PIPE HAVING UPSET COUPLING MEANS AT EACH END THEREOF COMPRISING THE STEPS OF: HEATING A SPLIT SLEEVE; HOLDING THE SLEEVE TIGHTLY AROUND THE CENTER PORTION OF THE DRILL PIPE; WELDING THE SPLIT SLEEVE TO FORM AN INTEGRAL SLEEVE WHILE HOLDING THE SLEEVE TIGHTLY AROUND THE DRILL PIPE AND PROTECTING THE DRILL PIPE FROM EXCESSIVE HEAT CAUSED BY THE WELD; AND, COOLING THE INTEGRALLY FORMED SLEEVE WHEREBY THE SLEEVE WILL CONTRACT AND TIGHTLY GRIP THE PIPE.
Claim 2
Independent Claim
92 words
A METHOD FOR APPLYING A PROTECTIVE SLEEVE DEVICE TO THE CENTER PORTION OF A JOINT OF DRILL PIPE HAVING UPSET COUPLING MEANS AT EACH END THEREOF COMPRISING THE STEPS OF: HEATING A SPLIT SLEEVE; HOLDING THE SLEEVE TIGHTLY AROUND THE CENTER PORTION OF THE DRILL PIPE; WELDING THE SPLIT SLEEVE TO FORM AN INTEGRAL SLEEVE WHILE HOLDING THE SLEEVE TIGHTLY AROUND THE DRILL PIPE AND PROTECTING THE DRILL PIPE FROM EXCESSIVE HEAT CAUSED BY THE WELD; AND, COOLING THE INTEGRALLY FORMED SLEEVE WHEREBY THE SLEEVE WILL CONTRACT AND TIGHTLY GRIP THE PIPE.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-07-12 | 1969-01-11 | 1969-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-12 | 1973-01-11 | 1973-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-12 | 1977-01-11 | 1977-07-13 | $7700.00 | Window Closed / Lapsed |