Patent US2459803A successfully refreshed from Google Patents.
US3753704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of clad metal articles
Assignee: Huntington Alloys Corp
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Filing: 1970-08-25
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Granted: 1973-08-21
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Expires: 1990-08-25
Abstract
Abstract Production of clad stock, e.g., bar, tubing, pipe, etc., wherein the cladding is prepared by pressing metal powders to desired form, the green form is sintered and coextruded hot with the core or basis material. Highly corrosion resistant cladding metals can be applied to basis materials of iron-group metals including common structural materials and high recovery of the cladding material is obtained. Externally or internally clad tubes have a cladding of 50 percent nickel-50 percent chromium alloy on substrates of steels, nickel alloys, including nickel-chromium alloys, etc., can readily be produced for use in applications requiring resistance to severe corrosive conditions at various temperatures.
Inventors
- 👤 C Manilla
- 👤 Honaker H Hilton
- 👤 Gothard D Olen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 20:53
CPC Classifications
B; B22; B22F; B22F7/00; B22F7/06; B22F7/08; B21; B21C; B21C23/00; B21C23/22; B21C33/00; B21C33/002; B21C33/004; B22F3/00; B22F3/20
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
15 words
The method according to claim 4 wherein said preform is sintered prior to said assembly.
Claim 2
Dependent Claim
29 words
The method according to claim 4 wherein said metal powders are isostatically pressed against the interior surface of said hollow, substantially cylindrical basis metal shape and are thereafter sintered.
Claim 3
Independent Claim
153 words
A method for producing a wrought composite metal tube having a powder metallurgy cladding on the internal surface thereof which comprises, isostatically pressing metal powders having a composition such that, when substantially fully densified, the melting point thereof is at least about 2,300*F. to form a compacted self-supporting preform of suBstantially uniform porosity and tubular shape, sintering said preform in a protective atmosphere, assembling said preform in contact with the interior surface of a hollow, substantially cylindrical fully dense basis metal shape made of metal having a melting point of at least about 2,300*F. and maintaining said preform and basis metal in said assembled relationship while coextruding them together at a temperature of at least about 2,000*F. through an extrusion die under protective conditions to produce a metallurgically bonded wrought composite metal tube having a thickness ratio of cladding to basis metal approximating the thickness ratio of the preform to the basis metal.
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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) | 1976-08-20 | 1977-02-19 | 1977-08-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-20 | 1981-02-19 | 1981-08-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-20 | 1985-02-19 | 1985-08-21 | $7700.00 | Window Closed / Lapsed |