US2789655A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic dust traps or filters
Assignee: Individual
•
Filing: 1953-08-03
•
Granted: 1957-04-23
•
Expires: 1973-08-03
Abstract
No abstract record available.
Inventors
- 👤 Ralph A Michael
- 👤 James A Newskirk
- 👤 William E Preston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:51
CPC Classifications
C; C10; C10K; C10K1/00; B; B03; B03C; B03C1/00; B03C1/02; B03C1/025; B03C1/031; B03C1/033; B03C1/0332; B03C1/28; B03C1/286; B03C2201/00; B03C2201/18; B03C2201/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-04-22 | 1960-10-22 | 1961-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-04-22 | 1964-10-22 | 1965-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-04-22 | 1968-10-22 | 1969-04-23 | $7700.00 | Window Closed / Lapsed |