Patent US2904129A successfully refreshed from Google Patents.
US2904129A
Expired / Lapsed
US
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Low pass filter type cleaner silencer unit
Assignee: Motors Liquidation Co
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Filing: 1956-09-20
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Granted: 1959-09-15
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Expires: 1976-09-20
Abstract
No abstract record available.
Inventors
- 👤 John D Mcmichael
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:12
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/14
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2507897A
Cited
US2652901A
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DE869710C
Cited
US2764142A
Cited
US2781861A
Cited
GB756640A
Cited
US2822885A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-09-14 | 1963-03-16 | 1963-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-09-14 | 1967-03-16 | 1967-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-09-14 | 1971-03-16 | 1971-09-15 | $7700.00 | Window Closed / Lapsed |