US3029577A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrostatic magnetic collecting system
Assignee: Research Cottrell Inc
•
Filing: 1960-01-26
•
Granted: 1962-04-17
•
Expires: 1980-01-26
Abstract
No abstract record available.
Inventors
- 👤 Carl W Hedberg
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 11:37
CPC Classifications
B; B03; B03C; B03C7/00; B03C7/02; B03C7/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1529970A
Cited
US2258194A
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US2854137A
Cited
US2785801A
Cited
US2789658A
Cited
US2874839A
Cited
US2786575A
Cited
US2866546A
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 |