Patent US2709864A successfully refreshed from Google Patents.
US4484644A
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US
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Sintered and forged article, and method of forming same
Assignee: Caterpillar Global Mining America LLC
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Filing: 1980-09-02
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Granted: 1984-11-27
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Expires: 2000-09-02
Abstract
Abstract An embodiment of the article comprises a metallic body formed, by a powder metallurgy technique, of steel powder and tungsten carbide particles, and forged, having a total density of not less than one hundred percent. The method, then, comprises (a) the powder metallurgy steps of forming and sintering the body, and (b) the subsequent forging step, to produce the one hundred percent total density steel and tungsten carbide article.
Inventors
- 👤 John P. Cook
- 👤 Bani R. Banerjee
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 12:26
CPC Classifications
E; E21; E21C; E21C35/00; E21C35/18; E21C35/183; B; B22; B22F; B22F7/00; B22F7/06; B23; B23B; B23B31/00; B23B31/005; B23B51/00; E21B; E21B10/00; E21B10/46; E21B10/58; E21C35/1835; B23B2231/00; B23B2231/02; B23B2231/0216; B23B2231/0232; B23B2240/00; B23B2240/08; B23B2250/00; B23B2250/12; B23B2251/00; B23B2251/50
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
107 words
A sintered and hot-forged article, having areas of differing hardness, comprising: a metallic, sintered and forged body; said body comprising a matrix homogeneously formed from a pair of ingredients comprising steel powder and tungsten carbide particles; and said body having a first matrix cross-section constituted by a first ratio of one of said ingredients to the other thereof, and a second matrix cross-section constituted by a second ratio of said one ingredient to said other ingredient; and wherein said first ratio is approximately eighty-five percent tungsten carbide to fifteen percent steel powder, and said second ratio is approximately fifty-five percent tungsten carbide to forty-five percent steel powder.
Claim 2
Dependent Claim
107 words
A sintered and hot-forged article, having areas of differing hardness, comprising: a metallic, sintered and forged body; said body comprising a matrix homogeneously formed from a pair of ingredients comprising steel powder and tungsten carbide particles; and said body having a first matrix cross-section constituted by a first ratio of one of said ingredients to the other thereof, and a second matrix cross-section constituted by a second ratio of said one ingredient to said other ingredient; and wherein said first ratio is approximately eighty-five percent tungsten carbide to fifteen percent steel powder, and said second ratio is approximately fifty-five percent tungsten carbide to forty-five percent steel powder.
Claim 3
Dependent Claim
51 words
An article, according to claim 1, wherein: said body has an insert-receiving recess formed therein; and further including a hard-metal insert fixed in said recess; wherein said insert has a greatest width of a given dimension; and said recess has a depth of not more than approximately one-third said given dimension.
Claim 4
Dependent Claim
31 words
An article, according to claim 1, wherein: said body has a working face, and a hard-metal formation extending outwardly from said face; and said formation comprises means for disintegrating earth structures.
Claim 5
Dependent Claim
18 words
An article, according to claim 3, wherein: said formation is an integral portion of said homogeneously-formed body matrix.
Claim 6
Dependent Claim
17 words
An article, according to claim 3, wherein: said formation is a discrete insert held by said body.
Claim 7
Dependent Claim
32 words
An article, according to claim 5, wherein: said insert has a given height dimension; and said insert is held by said body through not more than approximately half of said given dimension.
Claim 8
Dependent Claim
66 words
An article, according to claim 5, wherein: said insert has a base at one end and a nose portion contiguous therewith; only said end base is held by said body; and said base is formed with a tapered configuration having the greatest transverse dimension thereof spaced apart from said nose portion, and the smallest transverse dimension coincident with, and defining a commencement of, said nose portion.
Claim 9
Dependent Claim
19 words
An article, according to claim 7, wherein: said base is not more than approximately 0.125-inch (3.175 mm.) in depth.
Claim 10
Dependent Claim
27 words
An article, according to claim 7, wherein: said insert has a given height dimension; and said base comprises not more than approximately forty percent of said dimension.
Claim 11
Dependent Claim
28 words
An article, according to claim 5, wherein: said insert has a base at one end and a nose portion contiguous therewith; and said base has an undulated periphery.
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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) | 1987-11-27 | 1988-05-28 | 1988-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-11-27 | 1992-05-28 | 1992-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-11-27 | 1996-05-28 | 1996-11-27 | $7700.00 | Window Closed / Lapsed |