US3500614A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electro-aerodynamic precipitator
Assignee: University of Illinois at Urbana-Champaign
•
Filing: 1969-02-10
•
Granted: 1970-03-17
•
Expires: 1989-02-10
Abstract
No abstract record available.
Inventors
- 👤 Shao L Soo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:43
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/02; B03C3/04; B03C3/10
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB231786A
Cited
GB418551A
Cited
US2347709A
Cited
US2587173A
Cited
US2715944A
Cited
US2987137A
Cited
US2798572A
Cited
US3156547A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-03-16 | 1973-09-15 | 1974-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-03-16 | 1977-09-15 | 1978-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-03-16 | 1981-09-15 | 1982-03-17 | $7700.00 | Window Closed / Lapsed |