US2937710A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic dust traps or filters
Assignee: Individual
•
Filing: 1956-12-10
•
Granted: 1960-05-24
•
Expires: 1976-12-10
Abstract
No abstract record available.
Inventors
- 👤 Ralph A Michael
- 👤 James A Newkirk
- 👤 William E Preston
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 00:03
CPC Classifications
B; B03; B03C; B03C1/00; B03C1/02; B03C1/28
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US569203A
Cited
US817649A
Cited
US2508666A
Cited
US2314573A
Cited
US2596743A
Cited
GB673699A
Cited
US2721659A
Cited
US2789655A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1963-05-24 | 1963-11-23 | 1964-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1967-05-24 | 1967-11-23 | 1968-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1971-05-24 | 1971-11-23 | 1972-05-24 | $7700.00 | Window Closed / Lapsed |