US3790353A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hard-facing article
Assignee: SERVCO CO DIVISION SMITH INT I
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Filing: 1972-02-22
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Granted: 1974-02-05
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Expires: 1992-02-22
Abstract
Abstract A hard facing wear pad usable, for example, by brazing to a digger tooth or the like is provided in practice of this invention. The wear pad is from 70 to 85 percent by volume particles of cemented metal carbide in a metal matrix having a melting point not substantially higher than the melting point of the metal cementing the carbide. The cemented carbide particles are in the size range of from about 6 to 30 U.S. Sieve, and the thickness of the pad is within limits determined by the cemented carbide particle size.
Inventors
- 👤 H Jackson
- 👤 H Myers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 04:27
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/22; B23K35/24; B23K35/32; B23K35/327; C; C22; C22C; C22C29/00; Y; Y10; Y10S; Y10S428/00; Y10S428/922; Y10S428/923; Y10S428/924; Y10S428/926; Y10T; Y10T428/00; Y10T428/12; Y10T428/12014; Y10T428/12028; Y10T428/12063; Y10T428/12139
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
48 words
A wear pad as defined in claim 1 wherein the cemented metal carbide particles have a density substantially greater than the density of the metal matrix and wherein the metal matrix has a previously molten structure frozen with the greatest extent of the pad in a horizontal plane.
Claim 2
Dependent Claim
25 words
A wear pad as defined in claim 1 wherein the cemented metal carbide is predominantly tungsten carbide and the metal matrix is predominantly ''''nickel silver.''''
Claim 3
Dependent Claim
25 words
A wear pad as defined in claim 3 wherein the ''''nickel silver'''' is nominally about 48 percent copper, 41 percent zinc and 10 percent nickel.
Claim 4
Dependent Claim
152 words
A wear pad for attachment to a less wear-resistant substrate comprising: a plurality of particles of cemented metal carbide bonded together by and dispersed throughout a metal matrix; said cemented carbide particles being in the size range of from about 6 to 30 U.S. Sieve and having a sufficiently non-uniform size distribution to be present in a proportion in the range of from about 70 to 85 percent by volume; said wear pad having a thickness equal to the U. S. Sieve opening in inches in the range of from the minimum U. S. Sieve size to the maximum U. S. Sieve size of the cemented carbide particles in the wear pad, times a factor on the ordinate corresponding to that portion of the shaded area of FIG. 4 in the range bounded on the abscissa by the minimum U. S. Sieve size of the cemented carbide particles in the wear pad.
Claim 5
Dependent Claim
47 words
A wear pad as defined in claim 5 wherein the cemented metal carbide particles have a density substantially greater than the density of the metal matrix and wherein the metal matrix has a cast structure frozen with the greatest extent of the pad in a horizontal plane.
Claim 6
Dependent Claim
25 words
A wear pad as defined in claim 5 wherein the cemented metal carbide is predominantly tungsten carbide and the metal matrix is predominantly ''''nickel silver.''''
Claim 7
Dependent Claim
24 words
A wear pad as defined in claim 7 wherein the ''''nickel silver'''' is nominally 48 percent copper, 41 percent zinc and 10 percent nickel.
References Cited (Backward Citations)
US2833638A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-02-04 | 1977-08-06 | 1978-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-04 | 1981-08-06 | 1982-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-04 | 1985-08-06 | 1986-02-05 | $7700.00 | Window Closed / Lapsed |