US4043611A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hard surfaced well tool and method of making same
Assignee: Grant TFW Inc
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Filing: 1976-02-27
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Granted: 1977-08-23
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Expires: 1996-02-27
Abstract
Abstract A wear resistant tubular well tool, such as a tool joint, comprises a hollow cylindrical body having a hard metal, such as a coarse-grained sintered tungsten carbide, deposited on a portion of the exterior of the body and a fine-grained hard metal, such as a cast tungsten carbide, deposit covering substantially all of the external surface of said coarse-grained hard metal deposit. The method of making the well tool comprises depositing the coarse-grained hard metal by welding and then casting or fusing the finegrained hard metal over the coarse-grained hard metal layer.
Inventors
- 👤 Duane W. Wallace
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 15:38
CPC Classifications
E; E21; E21B; E21B17/00; E21B17/10; E21B17/1085; B; B22; B22F; B22F7/00; B22F7/06; B22F7/08; F; F16; F16L; F16L57/00; F16L57/06
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
45 words
A tool joint comprising a tubular body, at least one band of coarse-grained hard metal in an alloy steel matrix extending circumferentially around the exterior of said tubular body, and a continuous fine-grained cast tungsten carbide layer deposited to cover substantially all of said band.
Claim 2
Dependent Claim
45 words
A tool joint comprising a tubular body, at least one band of coarse-grained hard metal in an alloy steel matrix extending circumferentially around the exterior of said tubular body, and a continuous fine-grained cast tungsten carbide layer deposited to cover substantially all of said band.
Claim 3
Dependent Claim
15 words
A tool joint according to claim 1 wherein said hard metal is sintered tungsten carbide.
Claim 4
Dependent Claim
54 words
A tool for use in a well bore comprising a body, a deposit of coarse-grained hard metal in an alloy steel matrix on the exterior of said body, and a continuous layer of a fine-grained cast tungsten carbide over substantially all of said coarse-grained hard metal deposit and fused with said alloy steel matrix
Claim 5
Dependent Claim
54 words
A tool for use in a well bore comprising a body, a deposit of coarse-grained hard metal in an alloy steel matrix on the exterior of said body, and a continuous layer of a fine-grained cast tungsten carbide over substantially all of said coarse-grained hard metal deposit and fused with said alloy steel matrix
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-08-22 | 1981-02-21 | 1981-08-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-08-22 | 1985-02-21 | 1985-08-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-08-22 | 1989-02-21 | 1989-08-23 | $7700.00 | Window Closed / Lapsed |