Patent US3915898A successfully refreshed from Google Patents.
US3915898A
Expired / Lapsed
US
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Catalyst
Assignee: Johnson Matthey PLC
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Filing: 1972-08-09
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Granted: 1975-10-28
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Expires: 1992-08-09
Abstract
Abstract Arrangement of catalytic gauzes for catalysing a reaction between two or more gases when passed through the gauzes. Essentially the arrangement comprises a first group of gauzes made from a precious metallic material and a second group of gauzes disposed on the downstream side of the first group of gauzes. The second group of gauzes are made from at least one material which is selected from the group consisting of nonprecious metallic materials and materials which are less easily volatalised and carried away by the gases than the precious metallic material of the first group of gauzes. The second group of gauzes assist in use in catalysing the reaction.
Inventors
- 👤 Gary James Keith Acres
- 👤 Alan Sydney Darling
- 👤 Laurence Alfred Heathcote
- 👤 Eric Shutt
- 👤 Gordon Leslie Selman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 21:59
CPC Classifications
C; C01; C01B; C01B21/00; C01B21/20; C01B21/24; C01B21/26; B; B01; B01J; B01J35/00; B01J35/50; B01J35/58
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
60 words
IN AN ARRANGEMENT FOR REACTING AT LEAST TWO GASES BY PASSING THEM THROUGH A PACK OF CATALYTIC GAUZES THE IMPROVEMENT WHEREIN SAID PACK COMPRISES A FIRST GROUP OG GAUZES MADE OF AN ALLOY CONSISTING ESSENTIALLY OF PLATINUM AND RHODIUM AND A SECOND GROUP OF GAUZES DISPOSED ON THE DOWNSTREAM SIDE OF THE FIRST GROUP OF GAUZES FOR SUPPORTING THE FIRST
Claim 2
Dependent Claim
60 words
IN AN ARRANGEMENT FOR REACTING AT LEAST TWO GASES BY PASSING THEM THROUGH A PACK OF CATALYTIC GAUZES THE IMPROVEMENT WHEREIN SAID PACK COMPRISES A FIRST GROUP OG GAUZES MADE OF AN ALLOY CONSISTING ESSENTIALLY OF PLATINUM AND RHODIUM AND A SECOND GROUP OF GAUZES DISPOSED ON THE DOWNSTREAM SIDE OF THE FIRST GROUP OF GAUZES FOR SUPPORTING THE FIRST
Claim 3
Dependent Claim
30 words
An arrangement according to claim 1 where the second group of gauzes are made from an alloy containing 16 wt.% platinum, 67 wt.% nickel and balance, apart from impurities, chromium.
Claim 4
Dependent Claim
78 words
In an arrangement for reacting at least two gases by passing them through a pack of catalytic gauzes, the improvement wherein said pack comprises a first group of gauzes being made of an alloy consisting essentially of platinum and rhodium and a second group of gauzes disposed on the downstream side of the first group of gauzes and supporting the first group, the second group of gauzes being made of an alloy consisting essentially of platinum and nickel.
Claim 5
Dependent Claim
78 words
In an arrangement for reacting at least two gases by passing them through a pack of catalytic gauzes, the improvement wherein said pack comprises a first group of gauzes being made of an alloy consisting essentially of platinum and rhodium and a second group of gauzes disposed on the downstream side of the first group of gauzes and supporting the first group, the second group of gauzes being made of an alloy consisting essentially of platinum and nickel.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-10-27 | 1979-04-28 | 1979-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-10-27 | 1983-04-28 | 1983-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-10-27 | 1987-04-28 | 1987-10-28 | $7700.00 | Window Closed / Lapsed |