US4183829A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalysts for purification of exhaust gases from internal combustion engines
Assignee: TDK Corp
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Filing: 1978-03-23
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Granted: 1980-01-15
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Expires: 1998-03-23
Abstract
Abstract Catalysts for purification of exhaust gases from internal combustion engines which are a mixture of aluminum oxide, calcium oxide and one or more of the elements platinum, palladium and rhodium, and method for their use.
Inventors
- 👤 Shichiro Adachi
- 👤 Suguru Takayama
- 👤 Takuo Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 12:53
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9445; B01D53/945; B01J; B01J23/00; B01J23/38; B01J23/54; B01J23/56; B01J23/58; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
84 words
A catalyst for the purification of exhaust gases from internal combustion engines consisting essentially of (1) a carrier which is aluminum oxide containing from 0.1 to 10 weight percent of calcium oxide, from 50% to 90% of the aluminum oxide being in the corundum form, the carrier supporting (2) at least one element selected from the group consisting of from 0.001 to 2.0 weight percent of platinum, from 0.005 to 1.0 weight percent of palladium and from 0.005 to 1.0 weight percent of rhodium.
Claim 2
Dependent Claim
84 words
A catalyst for the purification of exhaust gases from internal combustion engines consisting essentially of (1) a carrier which is aluminum oxide containing from 0.1 to 10 weight percent of calcium oxide, from 50% to 90% of the aluminum oxide being in the corundum form, the carrier supporting (2) at least one element selected from the group consisting of from 0.001 to 2.0 weight percent of platinum, from 0.005 to 1.0 weight percent of palladium and from 0.005 to 1.0 weight percent of rhodium.
Claim 3
Dependent Claim
13 words
A catalyst of claim 1 containing from 0.001 to 2.0 weight percent platinum.
Claim 4
Dependent Claim
13 words
A catalyst of claim 1 containing from 0.005 to 1.0 weight percent palladium.
Claim 5
Dependent Claim
13 words
A catalyst of claim 1 containing from 0.005 to 1.0 weight percent rhodium.
Claim 6
Dependent Claim
21 words
A catalyst of claim 1 containing from 0.001 to 2.0 weight percent platinum and from 0.005 to 1.0 weight percent rhodium.
Claim 7
Dependent Claim
13 words
A catalyst of claim 1 containing from 0.001 to 2.0 weight percent platinum.
Claim 8
Dependent Claim
13 words
A catalyst of claim 1 containing from 0.005 to 1.0 weight percent palladium.
Claim 9
Dependent Claim
13 words
A catalyst of claim 1 containing from 0.005 to 1.0 weight percent rhodium.
Claim 10
Dependent Claim
21 words
A catalyst of claim 1 containing from 0.001 to 2.0 weight percent platinum and from 0.005 to 1.0 weight percent rhodium.
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) | 1983-01-14 | 1983-07-16 | 1984-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-01-14 | 1987-07-16 | 1988-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-01-14 | 1991-07-16 | 1992-01-15 | $7700.00 | Window Closed / Lapsed |