US3544441A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic filtering for cleaning dielectric fluids
Assignee: EDWARD A GRISWOLD
•
Filing: 1966-03-29
•
Granted: 1970-12-01
•
Expires: 1986-03-29
Abstract
No abstract record available.
Inventors
- 👤 Edward A Griswold
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 20:37
CPC Classifications
B; B03; B03C; B03C5/00; B03C5/02; B03C5/022; B03C5/024; B01; B01D; B01D35/00; B01D35/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-30 | 1974-06-01 | 1974-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-30 | 1978-06-01 | 1978-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-30 | 1982-06-01 | 1982-12-01 | $7700.00 | Window Closed / Lapsed |