Patent US3881877A successfully refreshed from Google Patents.
US3881877A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst supporting screen
Assignee: Johnson Matthey Inc
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Filing: 1973-08-23
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Granted: 1975-05-06
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Expires: 1993-08-23
Abstract
Abstract A catalyst supporting structure comprising a layer of heatresistant wire elements composed of knitted wire, placed in contiguous relationship with each other to provide a pad of substantially uniform thickness and having flat top and bottom surfaces, with a woven sheet of heat resistant material bonded to each surface. The heat resistant wire elements and optionally the woven sheet consist essentially of an alloy of iron, chromium and aluminum.
Inventors
- 👤 James B Hunter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 02:59
CPC Classifications
B; B01; B01J; B01J12/00; B01J12/007; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/86; B01J23/862; B01J35/00; B01J35/50; B01J35/58
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
85 words
A CATALYST SUPPORTING STRUCTURE COMPRISING A PAD OF HEATRESISTANT WIRE ELEMENTS WHEREIN THE WIRE ELEMENTS ARE COMPOSED OF KNITTED WIRE, SAID ELEMENTS BEING PLACED IN LATERAL CONTACTING RELATIONSHIP WITH EACH OTHER TO PROVIDE A PAD OF SUBSTANTIALLY UNIFORM THICKNESS AND HAVING FLAT TOP AND BOTTOM SURFACES AND A WOVEN SHEET OF HEAT-RESISTANT MATERIAL, IN ADDITION TO SAID HEAT-RESISTANT WIRE ELEMENTS, POSITIONED DIRECTLY ON THE TOP AND BOTTOM SURFACES OF SAID PAD, SAID WIRE BEING COMPOSED OF AN ALLOY CONSISTING ESSENTIALLY OF ALUMINUM, CHROMIUM AND IRON.
Claim 2
Dependent Claim
85 words
A CATALYST SUPPORTING STRUCTURE COMPRISING A PAD OF HEATRESISTANT WIRE ELEMENTS WHEREIN THE WIRE ELEMENTS ARE COMPOSED OF KNITTED WIRE, SAID ELEMENTS BEING PLACED IN LATERAL CONTACTING RELATIONSHIP WITH EACH OTHER TO PROVIDE A PAD OF SUBSTANTIALLY UNIFORM THICKNESS AND HAVING FLAT TOP AND BOTTOM SURFACES AND A WOVEN SHEET OF HEAT-RESISTANT MATERIAL, IN ADDITION TO SAID HEAT-RESISTANT WIRE ELEMENTS, POSITIONED DIRECTLY ON THE TOP AND BOTTOM SURFACES OF SAID PAD, SAID WIRE BEING COMPOSED OF AN ALLOY CONSISTING ESSENTIALLY OF ALUMINUM, CHROMIUM AND IRON.
Claim 3
Dependent Claim
22 words
The structure of claim 1 wherein the woven sheets are also composed of an alloy consisting essentially of aluminum, chromium and iron.
Claim 4
Dependent Claim
22 words
A catalyst supporting structure according to claim 1 wherein the wire elements are rolled and shaped into rope elements having flat sides.
Claim 5
Dependent Claim
17 words
A catalyst supporting structure according to claim 1 wherein the wire elements are essentially square in cross-section.
Claim 6
Dependent Claim
70 words
A catalyst supporting structure according to claim 1 and comprising said wire elements arranged in parallel in a common plane and of varying lengths so as to form said pad, another such element or elements peripherally encompassing said pad to enclose the elements arranged in parallel, and woven sheets of heat-resistant material on the top and bottom of said pad, said sheets being bonded to the pad at spaced intervals.
Claim 7
Dependent Claim
30 words
A catalyst supporting structure according to claim 1 wherein the wire elements are composed of an alloy consisting essentially of 20-30 percent chromium, 4-6 percent aluminum, the balance being iron.
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) | 1978-05-05 | 1978-11-04 | 1979-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-05-05 | 1982-11-04 | 1983-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-05-05 | 1986-11-04 | 1987-05-06 | $7700.00 | Window Closed / Lapsed |