US3755534A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalytic control of auto exhaust emissions
Assignee: WR Grace and Co Conn
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Filing: 1971-08-12
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Granted: 1973-08-28
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Expires: 1991-08-12
Abstract
Abstract A METHOD OF CONVERTING THE NOXIOUS COMPONENTS OF AUTO EXHAUST GASES TO INNOCUOUS ENTITIES BY CONTACTING THE GASES WITH A PALLADIUM CATALYST ON A SUITABLE SUPPORT FOLLOWED BY PASSING THE GASES OVER A CATALYST ACTIVE FOR HYDROCARBON CONVERSION ON A SUITABLE SUPPORT. THE USE OF THIS PARTICULAR CONFIGURATION RESULTS IN IMPROVED CONVERSION OF THE CARBON MONOXIDE AND HYDROCARBONS IN THE EXHAUST GASES.
Inventors
- 👤 J Graham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:27
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/944; B01D53/9459; B01D53/9477; B01D2251/00; B01D2251/10; B01D2251/102; B01D2255/00; B01D2255/10; B01D2255/102; B01D2255/1021; B01D2255/1023; B01D2255/20; B01D2255/207; B01D2255/2073; B01D2255/20746; 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) | 1976-08-27 | 1977-02-26 | 1977-08-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-08-27 | 1981-02-26 | 1981-08-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-08-27 | 1985-02-26 | 1985-08-28 | $7700.00 | Window Closed / Lapsed |