US3489669A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrohydrodynamic apparatus for removing particles from a particle-laden fluid
Assignee: Northrop Grumman Guidance and Electronics Co Inc
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Filing: 1966-06-30
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Granted: 1970-01-13
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Expires: 1986-06-30
Abstract
No abstract record available.
Inventors
- 👤 Lothar H Ruhnke
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:00
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/02; B03C3/04; B03C3/14; B03C3/155; B03C5/00; B03C5/02; B03C5/022; B03C5/026; F; F01; F01N; F01N3/00; F01N3/01; B03C2201/00; B03C2201/14; F01N2450/00; F01N2450/30; Y; Y02; Y02T; Y02T10/00; Y02T10/10; Y02T10/12; Y10; Y10S; Y10S55/00; Y10S55/36
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-01-12 | 1973-07-14 | 1974-01-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-01-12 | 1977-07-14 | 1978-01-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-01-12 | 1981-07-14 | 1982-01-13 | $7700.00 | Window Closed / Lapsed |