US3444672A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Air cleaner for turbine engines
Assignee: MICHIGAN DYNAMICS Inc A CORP OF MI
•
Filing: 1967-05-08
•
Granted: 1969-05-20
•
Expires: 1987-05-08
Abstract
No abstract record available.
Inventors
- 👤 Darriel L Alsobrooks
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 01:04
CPC Classifications
F; F02; F02M; F02M35/00; F02M35/02; F02C; F02C7/00; F02C7/04; F02C7/05; F02C7/052
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1930476A
Cited
US1958145A
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US2244165A
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US3273324A
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US3107987A
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US3258895A
Cited
US3263906A
Cited
US3276189A
Cited
US3354621A
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Cited
US3336733A
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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) | 1972-05-19 | 1972-11-18 | 1973-05-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-05-19 | 1976-11-18 | 1977-05-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-05-19 | 1980-11-18 | 1981-05-20 | $7700.00 | Window Closed / Lapsed |