US2986873A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exhaust gas purifiers
Assignee: Individual
•
Filing: 1957-08-13
•
Granted: 1961-06-06
•
Expires: 1977-08-13
Abstract
No abstract record available.
Inventors
- 👤 Smith William George
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 09:00
CPC Classifications
F; F01; F01N; F01N3/00; F01N3/08; Y; Y10; Y10S; Y10S55/00; Y10S55/30
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1846057A
Cited
US2217241A
Cited
US2188717A
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US2211795A
Cited
US2548966A
Cited
US2600733A
Cited
US2795488A
Cited
US2747844A
Cited
US2803309A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1964-06-05 | 1964-12-05 | 1965-06-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1968-06-05 | 1968-12-05 | 1969-06-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1972-06-05 | 1972-12-05 | 1973-06-06 | $7700.00 | Window Closed / Lapsed |