US3477948A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic filter and method of operating same
Assignee: Individual
•
Filing: 1966-12-01
•
Granted: 1969-11-11
•
Expires: 1986-12-01
Abstract
No abstract record available.
Inventors
- 👤 Kiyoshi Inoue
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:38
CPC Classifications
B; B03; B03C; B03C1/00; B03C1/02; B03C1/025; B03C1/031; B03C1/032
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2452220A
Cited
US2398725A
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DE1012871B
Cited
GB803177A
Cited
US2943739A
Cited
US2954122A
Cited
US2999275A
Cited
US3271283A
Cited
US3349918A
Cited
US3382978A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-11-10 | 1973-05-12 | 1973-11-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-11-10 | 1977-05-12 | 1977-11-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-11-10 | 1981-05-12 | 1981-11-11 | $7700.00 | Window Closed / Lapsed |