Patent US3729402A successfully refreshed from Google Patents.
US3729402A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic filter for cleaning dielectric fluids
Assignee: Individual
•
Filing: 1970-11-27
•
Granted: 1973-04-24
•
Expires: 1990-11-27
Abstract
Abstract APPARATUS FOR REDUCING OR ELIMINATING DESTRUCTIVE ELECTRICAL ARCING BETWEEN INNER AND OUTER ELECTRODES INCLUDES AN ELONGATED INNER ELECTRODE ELEMENT, AN ELONGATED OUTER SHELL ELEMENT SPACED FROM AND CONTAINING THE INNER ELECTRODE, WHEREBY AN ELECTRIC FIELD MAY BE ESTABLISHED BETWEEN THE ELEMENTS, AND POROUS MEDIA IN THE SPACE BETWEEN THE ELEMENTS TO TRAP PARTICLES MIGRATING IN THE DIRECTION OF THE FIELD. A DIELECTRIC COATING IN THE SPACE BETWEEN THE ELECTRODES MAY BE APPLICABLE TO THE ELEMENT, ELEMENTS AND/OR MEDIA, FOR CHEMICAL AND ELECTRICAL MODIFICATION OF THE SURFACES SO COATED.
Inventors
- 👤 E Griswold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:42
CPC Classifications
B; B01; B01D; B01D35/00; B01D35/06; B03; B03C; B03C5/00; B03C5/02; B03C5/022; B03C5/024
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1976-04-23 | 1976-10-23 | 1977-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-04-23 | 1980-10-23 | 1981-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-04-23 | 1984-10-23 | 1985-04-24 | $7700.00 | Window Closed / Lapsed |