Patent US2841951A successfully refreshed from Google Patents.
US2841951A
Expired / Lapsed
US
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Apparatus for reducing exhaust gas pressure in internal combustion engines
Assignee: Individual
•
Filing: 1954-11-05
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Granted: 1958-07-08
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Expires: 1974-11-05
Abstract
No abstract record available.
Inventors
- 👤 Richard T Whitcomb
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 05:31
CPC Classifications
F; F02; F02B; F02B27/00; F02B27/04; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12
Claims Analysis
Total Claims: 0
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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) | 1961-07-07 | 1962-01-06 | 1962-07-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-07-07 | 1966-01-06 | 1966-07-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-07-07 | 1970-01-06 | 1970-07-08 | $7700.00 | Window Closed / Lapsed |