Patent US3637528A successfully refreshed from Google Patents.
US3637528A
Expired / Lapsed
US
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Low temperature-shift catalyst
Assignee: EIDP Inc
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Filing: 1969-08-26
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Granted: 1972-01-25
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Expires: 1989-08-26
Abstract
Abstract A reduced zinc oxide-copper oxide low-temperature shift catalyst is prepared that contains colloidal silica and diatomaceous earth. The resulting catalyst has improved pore, density and strength characteristics.
Inventors
- 👤 Alvin B Stiles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 15:58
CPC Classifications
C; C01; C01B; C01B3/00; C01B3/02; C01B3/06; C01B3/12; C01B3/16; B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/80; Y; Y02; Y02P; Y02P20/00; Y02P20/50; Y02P20/52
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
49 words
In an improved low temperature zinc oxide-copper oxide shift catalyst, having on a weight ratio 0.5 to 4 zinc to 1 copper, the improvement comprising the presence of 0.60 to 10.5 percent by weight of colloidal silica and 1 to 20 percent by weight diatomaceous earth in the catalyst.
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) | 1975-01-24 | 1975-07-26 | 1976-01-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-01-24 | 1979-07-26 | 1980-01-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-01-24 | 1983-07-26 | 1984-01-25 | $7700.00 | Window Closed / Lapsed |