US3029578A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic filters
Assignee: GEA Group AG
•
Filing: 1959-03-09
•
Granted: 1962-04-17
•
Expires: 1979-03-09
Abstract
No abstract record available.
Inventors
- 👤 Wiemer Jean
- 👤 Muller Heinz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 19:13
CPC Classifications
B; B03; B03C; B03C3/00; B03C3/01; Y; Y10; Y10S; Y10S261/00; Y10S261/54; Y10S55/00; Y10S55/37
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US1728130A
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GB338827A
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US1905993A
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GB419610A
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US2273194A
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US2667941A
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US2723842A
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GB786313A
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US2841242A
Cited
US2949168A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-16 | 1965-10-16 | 1966-04-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-16 | 1969-10-16 | 1970-04-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-16 | 1973-10-16 | 1974-04-17 | $7700.00 | Window Closed / Lapsed |