US3751386A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst for purification of waste gases
Assignee: DT GOLD SILBER SCHEIDEANSTALT DT
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Filing: 1971-04-13
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Granted: 1973-08-07
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Expires: 1991-04-13
Abstract
Abstract CATALYST COMPOSITIONS ARE PROVIDED CONTAINING ALUMINIUM OXIDE AND FROM 50% TO 90% BY WEIGHT OF OXIDE OF COPPER, CHROMIUM AND NICKEL, WHICH MAY OPTIONALLY BE DOPED WITH GROUP II-A METAL COMPOUNDS, THE OXIDE OF NICKEL AMOUNTING FROM 2% TO 20% BY WEIGHT OF THE CATALYST. THE CATALYSTS ARE MANUFACTURED BY MIXING POWDERED CALCINED OXIDE OF COPPER AND CHROMIUM WITH ALUMINIUM OXIDE OR ALUMINIUM OXIDE HYDRATE, FORMING CATALYST GRANULES FROM THE MIXTURE AND THEN IMPREGNATING THE GRANULES WITH A NICKEL COMPOUND WHICH ON CALCINATION WILL FORM THE CATALYST. THE CATALYSTS ARE USED IN THE OXIDATIVE PURIFICATION OF WASTE GASES PARTICULARLY MOTOR VEHICLE EXHAUST GASES.
Inventors
- 👤 E Koberstein
- 👤 E Lakatos
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 10:02
CPC Classifications
B; B01; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/85; B01J23/86; B01J23/868; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/944; B01D2255/00; B01D2255/20; B01D2255/207; B01D2255/20753; B01D2255/20761; B01D2255/20784
Claims Analysis
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References Cited (Backward Citations)
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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) | 1976-08-06 | 1977-02-05 | 1977-08-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-06 | 1981-02-05 | 1981-08-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-06 | 1985-02-05 | 1985-08-07 | $7700.00 | Window Closed / Lapsed |