US3622310A
Expired / Lapsed
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Process of preparing noble metal materials having improved high temperature strength properties
Assignee: Evonik Operations GmbH
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Filing: 1969-01-17
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Granted: 1971-11-23
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Expires: 1989-01-17
Abstract
Abstract The high temperature strength properties of noble metals, particularly platinum are improved by adding an element having an affinity for oxygen, preferably zirconium, and heating either (1) at 800* to 1,200* C. or (2) stepwise heating at 300* to 800* C. followed by heating at 800* to 1,400* C.
Inventors
- 👤 Gerhard Reinacher
- 👤 Gerhard Zwingmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:40
CPC Classifications
C; C22; C22C; C22C32/00; C22C32/001; C22C32/0015; C22C32/0021; C22F; C22F1/00
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
44 words
A process according to claim 1 wherein the annealing treatment is in an oxygen containing atmosphere at 800* to 1200* C. for at least 5 hours and the element having an affinity for oxygen is present in an amount of 0.1 to 5 percent.
Claim 2
Dependent Claim
11 words
A process according to claim 2 wherein said element is zirconium.
Claim 3
Dependent Claim
13 words
A process according to claim 3 wherein the noble metal is predominantly platinum.
Claim 4
Dependent Claim
15 words
A process according to claim 2 wherein the zirconium is between 0.5 and 2 percent.
Claim 5
Dependent Claim
20 words
A process according to claim 5 wherein the noble metal is a platinum-rhodium alloy containing 1 to 49 percent rhodium.
Claim 6
Dependent Claim
21 words
A process according to claim 6 wherein the rhodium is 10 percent and the zirconium is between 0.5 and 2 percent.
Claim 7
Dependent Claim
20 words
A process according to claim 7 wherein the noble metal is a platinum-palladium alloy containing 1 to 49 percent palladium.
Claim 8
Dependent Claim
24 words
A process according to claim 1 where the element having an affinity for oxygen is present in an amount of 0.1 to 5 percent.
Claim 9
Dependent Claim
11 words
A process according to claim 9 wherein said element is zirconium.
Claim 10
Dependent Claim
13 words
A process according to claim 10 wherein the noble metal is predominantly platinum.
Claim 11
Dependent Claim
15 words
A process according to claim 11 wherein the zirconium is between 0.5 and 2 percent.
Claim 12
Dependent Claim
20 words
A process according to claim 12 wherein the noble metal is a platinum-rhodium alloy containing 1 to 49 percent rhodium.
Claim 13
Dependent Claim
15 words
A process according to claim 1 wherein the noble metal is treated in powdered form.
Claim 14
Dependent Claim
16 words
A process of preparing the product of claim 1 wherein the oxygen containing atmosphere is air.
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) | 1974-11-22 | 1975-05-24 | 1975-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-11-22 | 1979-05-24 | 1979-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-11-22 | 1983-05-24 | 1983-11-23 | $7700.00 | Window Closed / Lapsed |