US4769356A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalyst for purifying exhaust gas
Assignee: Panasonic Holdings Corp
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Filing: 1986-06-17
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Granted: 1988-09-06
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Expires: 2006-06-17
Abstract
Abstract Catalysts of reduced cost, for purifying exhaust gases, having smaller thermal expansion coefficients than conventional catalysts, good mechanical strength and large specific surface area are provided at low temperatures. The composition composed of at least re-hydrable alumina, an alkali or alkaline earth metal titanate and fused silica is thermally processed at comparatively low temperatures so as to provide ceramic catalyst carriers which have superior properties.
Inventors
- 👤 Yasuhiro Takeuchi
- 👤 Atsushi Nishino
- 👤 Yukiyoshi Ono
- 👤 Hironao Numoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:47
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J; B01J23/00; B01J23/02; B01J23/04; C; C04; C04B; C04B35/00; C04B35/01; C04B35/14; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
70 words
A catalyst for purifying exhaust gases comprising a carrier and a catalytic compound deposited on the carrier, said carrier being a ceramic produced by heating a composition comprising a mixture of 5 to 20 parts by weight rehydratable alumina, 1 to 10 parts by weight of alkali or alkaline earth metal titanate and 70 to 94 parts by weight of fused silica at a temperature of 1100° to 1300° C.
Claim 2
Dependent Claim
70 words
A catalyst for purifying exhaust gases comprising a carrier and a catalytic compound deposited on the carrier, said carrier being a ceramic produced by heating a composition comprising a mixture of 5 to 20 parts by weight rehydratable alumina, 1 to 10 parts by weight of alkali or alkaline earth metal titanate and 70 to 94 parts by weight of fused silica at a temperature of 1100° to 1300° C.
Claim 3
Dependent Claim
22 words
The catalyst for purifying exhaust gases in accordance with claim 1 wherein the alkali or alkaline earth metal titanate is potassium titanate.
Claim 4
Dependent Claim
14 words
The catalyst according to claim 1 wherein said catalytic compound comprises platinum and rhodium.
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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) | 1991-09-06 | 1992-03-07 | 1992-09-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-09-06 | 1996-03-07 | 1996-09-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-09-06 | 2000-03-07 | 2000-09-06 | $7700.00 | Window Closed / Lapsed |