US3640705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of platinum group metals and alloys
Assignee: Johnson Matthey PLC
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Filing: 1969-01-30
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Granted: 1972-02-08
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Expires: 1989-01-30
Abstract
Abstract An alloy and method for making the same including alloying with platinum, rhodium, iridium and their mixtures, alone or alloyed with palladium a stable base metal capable of forming a refractory compound. The resulting alloy is heated in the presence of a molecular oxygen containing gas such as air or oxygen at a temperature ranging from 900* to at least 1,200* C. whereby the stable refractory compound is formed internally of said alloy and is dispersed uniformly therethrough.
Inventors
- 👤 Gordon Leslie Selman
- 👤 Peter James Ellison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 02:14
CPC Classifications
C; C22; C22C; C22C1/00; C22C1/02; C22C1/10; C22C1/1078; C22C5/00
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
22 words
The method of claim 1 wherein said alloy, heated in the presence of a gas containing molecular oxygen, is in powder form.
Claim 2
Independent Claim
156 words
A method of making an alloy exhibiting the properties of oxidation resistance and high mechanical strength which comprises alloying a metal selected from the group consisting of platinum, rhodium and their mixtures, alloyed with palladium, with at least one member capable of forming a stable refractory compound and selected from the group consisting of beryllium, magnesium, aluminum, silicon, thorium, uranium, metals in the first transition series consisting of calcium through nickel, metals in the second transition series consisting of strontium through molybdenum and metals in the third transition series consisting of barium through tantalum, said member being present in an amount ranging from a trace to 5 percent by weight of said alloy, heating said alloy in massive form in the presence of a gas containing molecular oxygen at a temperature ranging from about 900* to at least 1,200* C. whereby said stable refractory compound is formed internally of said alloy and is dispersed uniformly therethrough.
Claim 3
Independent Claim
121 words
A method of making an alloy exhibiting the properties of oxidation resistance and high mechanical strength which comprises alloying a metal selected from the group consisting of platinum, rhodium and their mixtures alloyed with palladium, with at least one member capable of forming a stable refractory compound and selected from the group consisting of zirconium, aluminum, beryllium, and titanium, the said member being present in an amount ranging from a trace up to 5 percent by weight of the said alloy, heating said alloy in the presence of a gas containing molecular oxygen at a temperature ranging from about 900* to at least 1,200* C. whereby said stable refractory compound is formed internally of said alloy and is dispersed uniformly therethrough.
Claim 4
Dependent Claim
30 words
A method according to claim 4 wherein the alloy comprises 89.8 percent platinum, 10 percent palladium and 0.2 percent aluminum, and where heating is carried out in an argon atmosphere.
Claim 5
Dependent Claim
30 words
A method according to claim 4 wherein the alloy comprises 89.8 percent platinum, 15 percent rhodium and 0.2 percent beryllium and wherein heating is carried out in an argon atmosphere.
Claim 6
Dependent Claim
31 words
A method according to claim 4 wherein the alloy comprises 89.92 percent platinum, 10 percent palladium and 0.08 percent titanium and wherein the heating is carried out in an argon atmosphere.
Claim 7
Dependent Claim
14 words
The method of claim 4 wherein said alloy being heated is in massive form.
Claim 8
Dependent Claim
52 words
The method of claim 4 wherein said alloy being heated is in powder form and which method includes, subsequent to heating said powdered alloy whereby said stable refractory compound is formed internally thereof and dispersed uniformly therethrough, forming an ingot by pressing and sintering said powdered alloy and thereafter hot-forging the ingot.
Claim 9
Dependent Claim
83 words
A material consisting essentially of an alloy of metal selected from the group consisting of platinum, rhodium and their mixtures with palladium, and a stable refractory compound formed internally of said alloy and dispersed uniformly therethrough, said stable refractory compound being an oxide of a metal selected from the group consisting of zirconium, aluminum, beryllium and titanium, said oxide being present in said alloy in amounts ranging from trace to 5 percent by weight of said alloy, calculated on an elemental metal basis.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |