Patent US3969156A successfully refreshed from Google Patents.
US3969156A
Expired / Lapsed
US
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Method of making dispersion strengthened products
Assignee: KM Kabelmetal AG
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Filing: 1975-04-23
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Granted: 1976-07-13
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Expires: 1995-04-23
Abstract
Abstract Sheet metal or strips are rolled and heated for dispersion hardening. Disks are cut (punched), stacked, and extruded. The disks in the stack may alternate with disks which have not yet been hardened. Subsequent heat treatment of the extruded product strengthens it throughout. The method is used specifically to make a dispersion-strengthened copper alloy to be used for making electrodes for resistance welding.
Inventors
- 👤 Hans-Joachim Wallbaum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:29
CPC Classifications
B; B23; B23K; B23K35/00; B23K35/40; B23K35/402; B21; B21C; B21C37/00; B21C37/04
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
49 words
Method of making dispersion-hardened objects, comprising the steps of: providing a sheet or strip of metal amenable to dispersion strengthening; punching disks from the sheet or strip; annealing the disks or sheet or strip in an oxidizing atmosphere; stacking the disks as a blank assembly; and extruding the blank.
Claim 2
Dependent Claim
49 words
Method of making dispersion-hardened objects, comprising the steps of: providing a sheet or strip of metal amenable to dispersion strengthening; punching disks from the sheet or strip; annealing the disks or sheet or strip in an oxidizing atmosphere; stacking the disks as a blank assembly; and extruding the blank.
Claim 3
Dependent Claim
18 words
Method as in claim 1, wherein the dispersion affects a relatively thin surface layer of the metal only.
Claim 4
Dependent Claim
32 words
Method as in claim 1 and including the steps of providing additional disks of a metal amenable to hardening by thermal treatment and stacking them in alternating sequence to obtain the blank.
Claim 5
Dependent Claim
21 words
Method as in claim 3, wherein the first mentioned disks and the additional disks are different alloys of the same metal.
Claim 6
Dependent Claim
32 words
Method as in claim 4, whereinthe metal is copper and including the step of quenching wherein the extruded copper product and annealing the quenched product at a temperature from 400° to 550°C.
Claim 7
Dependent Claim
39 words
Method as in claim 1, wherein the metal is a copper alloy, the method including the steps of providing additional disks of a different copper alloy or pure copper and stacking them in alternating sequence to obtain the blank.
Claim 8
Dependent Claim
22 words
Method as in claim 6, wherein the disk of the blank facing an extruder die when placed therein is of pure copper.
Claim 9
Dependent Claim
37 words
Method as in claim 1 and including the steps of providing additional disks of the pure metal and stacking them in alternating sequence to obtain the blank, the first mentioned disks being an alloy of that metal.
Claim 10
Dependent Claim
21 words
Method as in claim 1 and including the step of quenching the extruded product and annealing the quenched product for tempering.
Claim 11
Dependent Claim
51 words
Method as in claim 1 and including the step of placing or assembling the stack in a copper tube having a height of the stack; using a copper alloy as the metal; and replacing air in the tube by a protective gas, the tube with stacked disks being the blank extruded.
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) | 1979-07-13 | 1980-01-12 | 1980-07-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-07-13 | 1984-01-12 | 1984-07-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-07-13 | 1988-01-12 | 1988-07-13 | $7700.00 | Window Closed / Lapsed |