US3487610A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic filter unit with high stable charge and its manufacture
Assignee: EIDP Inc
•
Filing: 1965-03-26
•
Granted: 1970-01-06
•
Expires: 1985-03-26
Abstract
No abstract record available.
Inventors
- 👤 Robert Glenn Brown
- 👤 Burton Nathaniel Derick
- 👤 Jon Ovitt Stanley
- 👤 John Mauldin Watkins Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 02:42
CPC Classifications
H; H01; H01G; H01G7/00; H01G7/02; H01G7/021; H01G7/023; B; B03; B03C; B03C3/00; B03C3/28; Y; Y10; Y10S; Y10S242/00; Y10S242/906; Y10S55/00; Y10S55/39; Y10T; Y10T83/00; Y10T83/647; Y10T83/6584
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) | 1973-01-05 | 1973-07-07 | 1974-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-05 | 1977-07-07 | 1978-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-05 | 1981-07-07 | 1982-01-06 | $7700.00 | Window Closed / Lapsed |