US3529404A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Control device for feed systems of electro-filters
Assignee: BBC Brown Boveri AG Germany
•
Filing: 1968-08-27
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Granted: 1970-09-22
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Expires: 1988-08-27
Abstract
No abstract record available.
Inventors
- 👤 Manfred Quissek
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 07:09
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/34; B03C3/66; B03C3/68; Y; Y10; Y10S; Y10S323/00; Y10S323/903
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2771150A
Cited
US2841239A
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US2943697A
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US2992699A
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US3114097A
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US3166705A
Cited
US3173772A
Cited
US3247451A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-21 | 1974-03-23 | 1974-09-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-21 | 1978-03-23 | 1978-09-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-21 | 1982-03-23 | 1982-09-22 | $7700.00 | Window Closed / Lapsed |