US3849342A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Catalysts for conversion of nitrogen oxide pollutants in automotive exhaust gases
Assignee: Texas Instruments Inc
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Filing: 1972-11-29
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Granted: 1974-11-19
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Expires: 1992-11-29
Abstract
Abstract 1. AN IMPROVED CATALYST FOR REDUCING NITROGEN OXIDES IN AUTOMATIVE EXHAUST GASES, SAID CATALYST COMPRISING A METAL ALLOY HAVING A COMPOSITION, BY WEIGHT, OF FROM ABOUT 25 TO 75 PERCENT NICKEL, FROM ABOUT 0.5 TO 20 PERCENT OF A METAL CATALYST SELECTED FROM THE GROUP CONSISTING OF VANADIUM, LANTHANUM AND DIDYMIUM, AND THE BALANCE COPPER AND IMPURITIES.
Inventors
- 👤 T Santala
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:47
CPC Classifications
C; C22; C22C; C22C19/00; C22C19/002; B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9459; B01D53/9463; B01D53/9472; B01J; B01J23/00; B01J23/10; B01J23/16; B01J23/20; B01J23/22; B01J35/00; B01J35/50; B01J35/58; B01J37/00; B01J37/02; B01J37/0215; B01J37/0225; B01D2255/00; B01D2255/20; B01D2255/206; B01D2255/2063; B01D2255/207; B01D2255/20723; B01D2255/20753; B01D2255/20761; B01D2255/20784; B01D53/9404; B01D53/9409; B01D53/944
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
56 words
AN IMPROVED CATALYST FOR REDUCING NITROGEN OXIDES IN AUTOMATIVE EXHAUST GASES, SAID CATALYST COMPRISING A METAL ALLOY HAVING A COMPOSITION, BY WEIGHT, OF FROM ABOUT 25 TO 75 PERCENT NICKEL, FROM ABOUT 0.5 TO 20 PERCENT OF A METAL CATALYST SELECTED FROM THE GROUP CONSISTING OF VANADIUM, LANTHANUM AND DIDYMIUM, AND THE BALANCE COPPER AND IMPURITIES.
Claim 2
Dependent Claim
56 words
AN IMPROVED CATALYST FOR REDUCING NITROGEN OXIDES IN AUTOMATIVE EXHAUST GASES, SAID CATALYST COMPRISING A METAL ALLOY HAVING A COMPOSITION, BY WEIGHT, OF FROM ABOUT 25 TO 75 PERCENT NICKEL, FROM ABOUT 0.5 TO 20 PERCENT OF A METAL CATALYST SELECTED FROM THE GROUP CONSISTING OF VANADIUM, LANTHANUM AND DIDYMIUM, AND THE BALANCE COPPER AND IMPURITIES.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-11-18 | 1978-05-20 | 1978-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-18 | 1982-05-20 | 1982-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-18 | 1986-05-20 | 1986-11-19 | $7700.00 | Window Closed / Lapsed |