US2768752A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Parallel folded filter
Assignee: Motors Liquidation Co
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Filing: 1950-02-14
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Granted: 1956-10-30
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Expires: 1970-02-14
Abstract
No abstract record available.
Inventors
- 👤 Russell S Thatcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 18:58
CPC Classifications
B; B01; B01D; B01D27/00; B01D27/04; B01D27/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1963945A
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FR46881E
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US2337579A
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US2395449A
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US2468862A
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US2491180A
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US2488726A
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US2569243A
Cited
FR886736A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-10-30 | 1960-04-30 | 1960-10-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-10-30 | 1964-04-30 | 1964-10-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-10-30 | 1968-04-30 | 1968-10-30 | $7700.00 | Window Closed / Lapsed |