Patent US3154980A successfully refreshed from Google Patents.
Patent US3504480A successfully refreshed from Google Patents.
US3504480A
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Electrostatic precipitator rapper control system
Assignee: Research Cottrell Inc
•
Filing: 1966-10-21
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Granted: 1970-04-07
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Expires: 1986-10-21
Abstract
No abstract record available.
Inventors
- 👤 Vincent W Copcutt
- 👤 Herbert J Hall
- 👤 Harold Van Hoesen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 10:03
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/34; B03C3/66; B03C3/68; B03C3/74; B03C3/76; B03C3/763; Y; Y10; Y10S; Y10S323/00; Y10S323/903
Claims Analysis
Total Claims: 0
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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) | 1973-04-06 | 1973-10-06 | 1974-04-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-04-06 | 1977-10-06 | 1978-04-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-04-06 | 1981-10-06 | 1982-04-07 | $7700.00 | Window Closed / Lapsed |