Patent US3044571A successfully refreshed from Google Patents.
US3044571A
Expired / Lapsed
US
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Internal combustion engine exhaust silencers
Assignee: Individual
•
Filing: 1960-11-30
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Granted: 1962-07-17
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Expires: 1980-11-30
Abstract
No abstract record available.
Inventors
- 👤 Spiegel Peter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 10:35
CPC Classifications
F; F01; F01N; F01N1/00; F01N1/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
FR464679A
Cited
US1292283A
Cited
GB221302A
Cited
FR674355A
Cited
FR730694A
Cited
US2075316A
Cited
US2037692A
Cited
US2169658A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-07-16 | 1966-01-15 | 1966-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-07-16 | 1970-01-15 | 1970-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-07-16 | 1974-01-15 | 1974-07-17 | $7700.00 | Window Closed / Lapsed |