Method of purifying exhaust gas from internal combustion engine
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
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Dec 7, 1999
Issued Date -
N/A
app pub date -
Jun 13, 1997
filing date -
Mar 9, 1995
priority date (Note) -
Expired
status (Latency Note)
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Abstract
This method comprises bringing exhaust gas from an internal combustion engine, which is operated at a fuel-lean air/fuel ratio, in contact with an iridium-containing catalyst in a first zone and then in contact with a platinum-containing catalyst in a second zone situated downstream of the first zone. This method is effective for exhaust gas from lean burn engines over a wide temperature range of 200 to 500.degree. C., produces less N.sub.2 O in a low-temperature range of 200 to 300.degree. C., and can purify exhaust gas stably and effectively even at a high temperature of 700.degree. C. or over.
First Claim
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Family

- 15 United States
- 10 France
- 8 Japan
- 7 China
- 5 Korea
- 2 Other
Patent Owner(s)
Patent Owner | Address | |
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N E CHEMCAT CORPORATION | 4-1 HAMAMATSU-CHO 2-CHOME MINATO-KU TOKYO 105-6124 |
International Classification(s)
Inventor(s)
Inventor Name | Address | # of filed Patents | Total Citations |
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Itoh, Takashi | Ichikawa, JP | 124 | 1561 |
# of filed Patents : 124 Total Citations : 1561 | |||
Kosaki, Yukio | Ichikawa, JP | 7 | 93 |
# of filed Patents : 7 Total Citations : 93 | |||
Shiokawa, Kazuhiko | Kamagaya, JP | 2 | 23 |
# of filed Patents : 2 Total Citations : 23 |
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Patent Citation Ranking
- 19 Citation Count
- B01D Class
- 54.90 % this patent is cited more than
- 26 Age
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Maintenance Fees
Fee | Large entity fee | small entity fee | micro entity fee | due date |
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Fee | Large entity fee | small entity fee | micro entity fee |
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Surcharge after expiration - Late payment is unavoidable | $700.00 | $350.00 | $175.00 |
Surcharge after expiration - Late payment is unintentional | $1,640.00 | $820.00 | $410.00 |
Full Text

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Dec 29, 2012 | STCF | INFORMATION ON STATUS: PATENT GRANT | free format text: PATENTED CASE |
Oct 18, 2012 | P | Published | |
Jun 27, 2012 | F | Filing | |
Aug 13, 2002 | AS | ASSIGNMENT | free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNORS:THIERS, BERNARD;HOCHEPIED, PETER JOZEF;REEL/FRAME:028461/0160 Owner name: UNILIN BEHEER B.V. BESLOTEN VENNOOTSCHAP, NETHERLA Effective Date: Aug 13, 2002 |
Aug 14, 2001 | PD | Priority Date |

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