US4154705A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic structure
Assignee: Alloy Surfaces Co Inc
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Filing: 1976-12-30
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Granted: 1979-05-15
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Expires: 1996-12-30
Abstract
Abstract Foil, wire and similar coherent bodies of catalytic metal are provided with catalytically active surfaces by diffusing a chemically removable metal such as aluminum or zinc into those surfaces and then selectively dissolving out at least about a third of the removable metal. Platinum wire screens activated in this way make effective exhaust catalysts for automotive engines.
Inventors
- 👤 Alfonso L. Baldi
- 👤 Victor V. Damiano
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 21:51
CPC Classifications
B; B01; B01J; B01J37/00; B01J37/06; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01J23/00; B01J23/38; B01J23/40; B01J23/70; B01J23/74; B01J23/755; B01J35/00; B01J35/50; B01J35/56; C; C23; C23C; C23C10/00; C23C10/02; C23C10/28; C23C10/34; C23C10/36; C23C10/38; C23C10/40; C23C10/48; C23C10/52; C23C10/54; C23C10/56; C23C10/60
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
63 words
A self-supported coherent structure essentially of metal selected from the class consisting of a platinum family metal and nickel, having its surface in the form of a three-dimensional micro-fissured fragmentation into cells principally ranging from about 500 Angstroms to about 5000 Angstroms in size and produced by dissolving out from that surface a different metal introduced into that surface by activated pack diffusion.
Claim 2
Dependent Claim
63 words
A self-supported coherent structure essentially of metal selected from the class consisting of a platinum family metal and nickel, having its surface in the form of a three-dimensional micro-fissured fragmentation into cells principally ranging from about 500 Angstroms to about 5000 Angstroms in size and produced by dissolving out from that surface a different metal introduced into that surface by activated pack diffusion.
Claim 3
Dependent Claim
27 words
The structure of claim 1 in which the metal is platinum and contains an amount of aluminum about 0.5 to about 10% by weight of the platinum.
Claim 4
Dependent Claim
27 words
The structure of claim 1 in which the metal is platinum and contains an amount of zinc about 0.5 to about 10% by weight of the platinum.
Claim 5
Dependent Claim
52 words
In the preparation of a highly active platinum catalyst, the improvement according to which aluminum is diffused into the platinum by activated pack diffusion, and the aluminum-containing platinum has at least about one-third of its aluminum leached out by a first treatment with aqueous caustic and a second treatment with aqueous acid.
Claim 6
Dependent Claim
52 words
In the preparation of a highly active platinum catalyst, the improvement according to which aluminum is diffused into the platinum by activated pack diffusion, and the aluminum-containing platinum has at least about one-third of its aluminum leached out by a first treatment with aqueous caustic and a second treatment with aqueous acid.
Claim 7
Dependent Claim
32 words
A stirrer propeller whos surface is nickel catalytically activated by first diffusing into it a chemically leachable alloying metal and then chemically leaching at least about a third of that leachable metal.
Claim 8
Dependent Claim
32 words
A stirrer propeller whos surface is nickel catalytically activated by first diffusing into it a chemically leachable alloying metal and then chemically leaching at least about a third of that leachable metal.
Claim 9
Dependent Claim
29 words
A platinum catalyst in the form of a platinum screen produced by the process of claim 4 in which essentially all the aluminum was leached out of the platinum.
Claim 10
Dependent Claim
30 words
The structure of claim 1 in which the metal is a wire screen in which the wire has a thickness from about one mil or less to about 10 mils.
Claim 11
Dependent Claim
22 words
The structure of claim 7 in which the metal is a platinum family metal and the wire is about 4 mils thick.
Claim 12
Dependent Claim
59 words
The structure of claim 1 in which the metal is platinum having a thickness from about 1 mil or less to about 10 mils, and it also has pores less than 100 Angstroms wide in a density of at least 10 8 per square centimeter of gross surface, the diffusion having been effected at about 800° to 850° F.
Claim 13
Dependent Claim
23 words
A stack of catalytic screens in which each screen is made of platinum hardened with rhodium and having the structure of claim 1.
Claim 14
Dependent Claim
31 words
The preparation of claim 4 in which the aqueous caustic leaching is effected until it is essentially completed, and the treatment with aqueous acid is a one-minute contact with strong acid.
Claim 15
Dependent Claim
22 words
The structure of claim 7 in which the metal is a platinum family metal and the wire is about 1 mil thick.
Claim 16
Dependent Claim
16 words
The metal structure of claim 1 containing about 0.5 to about 10% of the dissolved-out metal.
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) | 1982-05-14 | 1982-11-13 | 1983-05-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-05-14 | 1986-11-13 | 1987-05-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-05-14 | 1990-11-13 | 1991-05-15 | $7700.00 | Window Closed / Lapsed |