US3661806A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas oxidation catalyst and process
Assignee: WR Grace and Co
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Filing: 1970-01-05
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Granted: 1972-05-09
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Expires: 1990-01-05
Abstract
Abstract INTERNAL COMBUSTION ENGINE EXHAUST GAS OXIDATION CATALYST AND PROCESS OF TREATING THE EXHAUST GASES TO REMOVE AIR POLLUTANTS. THE CATALYST COMPRISES OXIDATION PROMOTERS DISPERSED UPON A MATRIX. THE CATALYST POSSESSES A SPECIFIC PORE VOLUME DISTRIBUTION WHEREIN 0.20 TO 0.35 CC/G. OF ITS PORE VOLUME ARE IN PORES HAVING A DIAMETER BELOW 120A., 0.10 TO 0.25 CC/G.ARE IN PORES HAVING A DIAMETER BETWEEN 120-3500 A. AND 0.35 TO 0.60 CC/G. ARE IN PORES HAVING A PORE DIAMETER GREATER THAN 3500 A. THE TOTAL PORE VOLUME OF THE CATLYST IS 0.65 TO 1.25 CC/G. THIS CATALYST HAS BEEN FOUND TO POSSESS AN UNUSUALLY LONG ACTIVITY LIFE.
Inventors
- 👤 Warren S Briggs
- 👤 Frank G Ciapetta
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:53
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/944; B01J; B01J23/00; B01J23/70; B01J23/89; B01J23/8933; B01J23/8993
Claims Analysis
Total Claims: 0
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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) | 1975-05-09 | 1975-11-08 | 1976-05-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-09 | 1979-11-08 | 1980-05-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-09 | 1983-11-08 | 1984-05-09 | $7700.00 | Window Closed / Lapsed |