US3663457A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of preparing an oxidizing catalyst for the exhaust gases of internal combustion engines
Assignee: KACHITA CO Ltd
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Filing: 1970-06-08
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Granted: 1972-05-16
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Expires: 1990-06-08
Abstract
Abstract A METHOD OF PREPARING A GRANULAR OXIDIZING CATALYST USEFUL IN THE CONVERSION OF CARBON MONOXIDE CONTAINED IN THE EXHAUST GASES OF INTERNAL COMBUSTION ENGINES TO HARMLESS CARBON DIOXIDE WHICH COMPRISES THE STEPS OF MIXING FINE POWDERS OF HIGH PURITY MANGANESE DIOXIDE, COPPER OXIDE, ACTIVATED ALUMINA AND ALUMINA CEMENT TOGETHER, KNEADING THE MIXED POWDERS WITH WATER INTO A PASTE, FORMING THE PASTE INTO WET GRANULES OF SUITABLE SIZE, ALLOWING THE STILL WET GRANULES TO STAND AS THEY ARE OVER 24 HOURS TO INCREASE THE HARDNESS THEREOF AND THERMALLY DRYING THEM FOR NATURAL SOLIDIFICATION INTO A RIGID FORM.
Inventors
- 👤 Takaaki Tamura
- 👤 Tsutomu Kato
- 👤 Kazuyoshi Sakamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 08:59
CPC Classifications
B; B01; B01D; B01D53/00; B01D53/34; B01D53/74; B01D53/86; B01D53/92; B01D53/94; B01D53/944; B01J; B01J23/00; B01J23/70; B01J23/76; B01J23/84; B01J23/889; B01J23/8892
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |