US3928241A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalysts for purifying exhaust gas
Assignee: Toyota Motor Corp
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Filing: 1973-02-12
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Granted: 1975-12-23
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Expires: 1993-02-12
Abstract
Abstract Exhaust gas purifying catalysts characterized in that alloys comprising 0.1-40% of Cu and the balance of Ni and/or Fe by weight as fundamental components are shaped as desired and are activated, at least partially, by providing their surfaces with oxidized enriched Cu layers thicker than 10 Beta in the oxidization atmosphere or by partially reducing the oxidized layers with hydrogen gas at high temperature.
Inventors
- 👤 Itaru Niimi
- 👤 Yasuhisa Kaneko
- 👤 Akiyoshi Morita
- 👤 Yasuo Nemoto
- 👤 Mitsuyoshi Sato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 20:36
CPC Classifications
C; C22; C22C; C22C38/00; C22C38/18; C22C38/40; C22C38/42; B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9404; B01D53/9409; B01D53/9413; B01J; B01J23/00; B01J23/70; B01J23/74; B01J23/755; B01J23/76; B01J23/84; B01J23/85; B01J23/86; B01J23/868; B01J37/00; B01J37/16; B01J37/18; B01D2255/00; B01D2255/20; B01D2255/207; B01D2255/20738; B01D2255/20746; B01D2255/20753; B01D2255/20761; B01D2255/20784
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
90 words
AN EXHAUST GAS PURIFYING CATALYST COMPRISING AN ALLOY CONSISTING ESSENTIALLY OF 0.1-40% CU AND THE BALANCE OF AT LEAST ONE OF THE GROUP CONSISTING OF NI, FE, AND A COMBINATION OF NI AND FE BY WEIGHT AS FUNDAMENTAL COMPONENTS, AND INCLUDING A SURFACE FORMED BY FIRST OXIDIZING THE ALLOY BY HEATING AT 700*C.-1100*C. IN AN OXIDIZING ATMOSPHERE FOR 1/2 TO 24 HOURS TO PROVIDE AN OXIDIZED LAYER AT LEAST 10$ IN A THICKNESS, AND THEREAFTER REDUCING THE OXIDIZED LAYER IN A REDUCING TAMOSPHERE AT APPROXIMATELY 800*C. FOR ABOUT 2 HOURS.
Claim 2
Dependent Claim
90 words
AN EXHAUST GAS PURIFYING CATALYST COMPRISING AN ALLOY CONSISTING ESSENTIALLY OF 0.1-40% CU AND THE BALANCE OF AT LEAST ONE OF THE GROUP CONSISTING OF NI, FE, AND A COMBINATION OF NI AND FE BY WEIGHT AS FUNDAMENTAL COMPONENTS, AND INCLUDING A SURFACE FORMED BY FIRST OXIDIZING THE ALLOY BY HEATING AT 700*C.-1100*C. IN AN OXIDIZING ATMOSPHERE FOR 1/2 TO 24 HOURS TO PROVIDE AN OXIDIZED LAYER AT LEAST 10$ IN A THICKNESS, AND THEREAFTER REDUCING THE OXIDIZED LAYER IN A REDUCING TAMOSPHERE AT APPROXIMATELY 800*C. FOR ABOUT 2 HOURS.
Claim 3
Dependent Claim
25 words
An exhaust gas purifying catalyst according to claim 1 including 40% or less of at least one of the group consisting of Co and Cr.
Claim 4
Dependent Claim
91 words
A process of producing a catalyst for purifying exhaust gas which comprises shaping an alloy as desired containing 0.1 - 40% of Cu and the balance of at least one of Ni and Fe as fundamental components and forming an oxidized layer of more than 10 Mu in thickness on the surface of said shaped alloy by heating same at 800*- 1300*C. in an oxidization atmosphere for 3 - 24 hours, and thereafter reducing the oxidizing layer by heating same in a reducing atmosphere at approximately 800*C. for about 2 hours.
Claim 5
Dependent Claim
91 words
A process of producing a catalyst for purifying exhaust gas which comprises shaping an alloy as desired containing 0.1 - 40% of Cu and the balance of at least one of Ni and Fe as fundamental components and forming an oxidized layer of more than 10 Mu in thickness on the surface of said shaped alloy by heating same at 800*- 1300*C. in an oxidization atmosphere for 3 - 24 hours, and thereafter reducing the oxidizing layer by heating same in a reducing atmosphere at approximately 800*C. for about 2 hours.
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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) | 1978-12-22 | 1979-06-23 | 1979-12-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-12-22 | 1983-06-23 | 1983-12-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-12-22 | 1987-06-23 | 1987-12-23 | $7700.00 | Window Closed / Lapsed |