US3228746A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of treating exhaust gases of internal combustion engines
Assignee: EIDP Inc
•
Filing: 1960-09-29
•
Granted: 1966-01-11
•
Expires: 1980-09-29
Abstract
No abstract record available.
Inventors
- 👤 Benjamin W Howk
- 👤 Alvin B Stiles
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:29
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/24; F01N3/30; F01N3/32; 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; F01N3/2882; F01N3/2885; B01D2251/00; B01D2251/10; B01D2251/102; B01D2255/00; B01D2255/20; B01D2255/207; B01D2255/2073; B01D2255/20738; B01D2255/20746; B01D2255/20753; B01D2255/20761; B01D2255/20784; B01D2255/20792; B01D2255/209; B01D2255/2094; B01D2258/00; B01D2258/01; F01N2270/00; F01N2270/02; F01N2330/00; F01N2330/08; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
66 words
A PROCESS FOR TREATMENT OF AUTOMOBILE EXHAUST GASES COMPRISING PASSING SAID GASES OVER MANGANESE CHROMITE HAVING A MN:CR ATOMIC RATIO OF 3:2 TO 3:3, SAID MANGANESE CHROMITE HAVING BEEN PREPARED BY REACTION IN AQUEOUS SOLUTION OF A DIVALENT MANGANESE SALT AND A HEXAVALENT CHROMIUM COMPOUND IN THE PRESENCE OF A PRECIPITANT SELECTED FROM THE GROUP CONSISTING OF AMMONIA, AMMONIUM HYDROXIDE, AMMONIUM CHROMATE AND AMMONIACAL AMMONIUM CHROMATE.
Claim 2
Dependent Claim
66 words
A PROCESS FOR TREATMENT OF AUTOMOBILE EXHAUST GASES COMPRISING PASSING SAID GASES OVER MANGANESE CHROMITE HAVING A MN:CR ATOMIC RATIO OF 3:2 TO 3:3, SAID MANGANESE CHROMITE HAVING BEEN PREPARED BY REACTION IN AQUEOUS SOLUTION OF A DIVALENT MANGANESE SALT AND A HEXAVALENT CHROMIUM COMPOUND IN THE PRESENCE OF A PRECIPITANT SELECTED FROM THE GROUP CONSISTING OF AMMONIA, AMMONIUM HYDROXIDE, AMMONIUM CHROMATE AND AMMONIACAL AMMONIUM CHROMATE.
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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) | 1969-01-10 | 1969-07-12 | 1970-01-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-10 | 1973-07-12 | 1974-01-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-10 | 1977-07-12 | 1978-01-11 | $7700.00 | Window Closed / Lapsed |