Patent US3536888A successfully refreshed from Google Patents.
Patent US4002503A successfully refreshed from Google Patents.
US4002503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of metals and alloy
Assignee: Johnson Matthey PLC
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Filing: 1975-04-01
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Granted: 1977-01-11
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Expires: 1995-04-01
Abstract
Abstract A method of improving the mechanical properties of a metal or metallic alloy or metallic composition which has been strengthened by inclusion therein of a dispersed non-metallic phase, comprising the steps of subjecting the metal, alloy or composition to cold-working and subsequently annealing, the extent of cold-working being such that the recrystallization effected during annealing results in an elongated grain structure highly oriented in the direction of working.
Inventors
- 👤 Alan Arthur Bourne
- 👤 Jack Chambers Chaston
- 👤 Alan Sydney Darling
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:57
CPC Classifications
C; C22; C22F; C22F1/00; C22F1/14; C22C; C22C32/00; C22C32/001; C22C32/0015; C22C32/0021
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
108 words
In a method of improving the mechanical properties of a previously strengthened metal composition comprising a platinum-rhodium alloy and including, as a dispersed phase, zirconium oxide as a strengthening element, said method comprising the steps of cold-working said composition by working the same at a temperature below that at which substantial recrystallization occurs and subsequently annealing the composition, the improvement whereby all of said cold-working at a temperature below that at which substantial recrystallization occurs is carried out prior to any annealing and the extent of cold-working is such that the recrystallization effected during annealing results in an elongated grain structure highly oriented in the direction of working.
Claim 2
Dependent Claim
108 words
In a method of improving the mechanical properties of a previously strengthened metal composition comprising a platinum-rhodium alloy and including, as a dispersed phase, zirconium oxide as a strengthening element, said method comprising the steps of cold-working said composition by working the same at a temperature below that at which substantial recrystallization occurs and subsequently annealing the composition, the improvement whereby all of said cold-working at a temperature below that at which substantial recrystallization occurs is carried out prior to any annealing and the extent of cold-working is such that the recrystallization effected during annealing results in an elongated grain structure highly oriented in the direction of working.
Claim 3
Dependent Claim
32 words
The method of claim 1 wherein the the cold-working is such that the cross-sectional area of said composition is reduced at least 70% and the composition is annealed at about 1400° C.
References Cited (Backward Citations)
US3366515A
Cited
US3388010A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-01-11 | 1980-07-12 | 1981-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-01-11 | 1984-07-12 | 1985-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-01-11 | 1988-07-12 | 1989-01-11 | $7700.00 | Window Closed / Lapsed |