US3695934A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic cleaning
Assignee: 3M Co
•
Filing: 1970-11-02
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Granted: 1972-10-03
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Expires: 1990-11-02
Abstract
Abstract ARTICLES ARE CLEANED BY IMMERSION IN A MOVING MAGNETIC FLUID CONTAINING A CLEANER, THE MOVEMENT BEING INDUCED BY AN ALTERNATING GRADIENT ELECTRO-MAGNETIC FIELD ACTING UPON MAGNETIC PARTICLES.
Inventors
- 👤 James F Feldhaus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:40
CPC Classifications
B; B24; B24B; B24B31/00; B24B31/10; B24B31/102; B03; B03C; B03C1/00; B03C1/02; B03C1/23; B03C1/24; B03C1/32; C; C23; C23G; C23G5/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-03 | 1976-04-03 | 1976-10-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-03 | 1980-04-03 | 1980-10-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-03 | 1984-04-03 | 1984-10-03 | $7700.00 | Window Closed / Lapsed |