US1848990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas treatment
Assignee: General Motors Research Corp
•
Filing: 1927-08-13
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Granted: 1932-03-08
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Expires: 1947-08-13
Abstract
No abstract record available.
Inventors
- 👤 Thomas A Boyd
- 👤 Wheeler G Lovell
- 👤 John M Campbell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:05
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; F01N3/10; F01N3/18; F01N3/24; F01N3/26; F01N2470/00; F01N2470/24; F01N3/30; F01N3/34; F01N3/38
Claims Analysis
Total Claims: 0
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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) | 1935-03-08 | 1935-09-07 | 1936-03-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1939-03-08 | 1939-09-07 | 1940-03-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1943-03-08 | 1943-09-07 | 1944-03-08 | $7700.00 | Window Closed / Lapsed |