Patent US3486083A successfully refreshed from Google Patents.
Patent US3544264A successfully refreshed from Google Patents.
US3544264A
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Method and means for two-stage catalytic treating of engine exhaust gases
Assignee: Universal Oil Products Co
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Filing: 1968-09-25
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Granted: 1970-12-01
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Expires: 1988-09-25
Abstract
No abstract record available.
Inventors
- 👤 Leslie C Hardison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:39
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/24; F01N3/30; F01N3/34; B; B01; B01D; B01D53/00; B01D53/34; B01D53/92; B01D53/94; B01D53/9404; B01D53/9409; B01D53/9413; B01D53/944; B01D53/9459; B01D53/9463; B01D53/9472; F01N13/00; F01N13/009; F01N13/0097; F01N3/28; F01N3/2803; F01N3/2832; F01N3/2835; F01N3/2839; F01N3/2846; F01N3/285; F01N3/2892; B01D2251/00; B01D2251/10; B01D2251/102; B01D2255/00; B01D2255/10; B01D2255/102; B01D2255/1021; B01D2255/1023; B01D2255/20; B01D2255/207; B01D2255/20723; B01D2255/20761; B01D2255/20784; F01N13/14; F01N2330/00; F01N2330/08; F01N2330/10; F01N2470/00; F01N2470/18; F01N2470/22; Y; Y02; Y02A; Y02A50/00; Y02A50/20; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S55/00; Y10S55/30
Claims Analysis
Total Claims: 0
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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) | 1973-11-30 | 1974-06-01 | 1974-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-30 | 1978-06-01 | 1978-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-30 | 1982-06-01 | 1982-12-01 | $7700.00 | Window Closed / Lapsed |