US2747742A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Filter and method of making same
Assignee: Motors Liquidation Co
•
Filing: 1952-05-31
•
Granted: 1956-05-29
•
Expires: 1972-05-31
Abstract
No abstract record available.
Inventors
- 👤 Darrell E Royer
- 👤 John H Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:27
CPC Classifications
B; B01; B01D; B01D29/00; B01D29/11; B01D29/111; B01D29/44; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/496; Y10T29/49604; Y10T29/49995; Y10T29/49996
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US633368A
Cited
US815290A
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US1208342A
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US1867137A
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US1922315A
Cited
GB505553A
Cited
US2271662A
Cited
FR874424A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-05-29 | 1959-11-28 | 1960-05-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-05-29 | 1963-11-28 | 1964-05-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-05-29 | 1967-11-28 | 1968-05-29 | $7700.00 | Window Closed / Lapsed |