US3211057A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetic low frequency band pass filter
Assignee: Individual
•
Filing: 1964-02-28
•
Granted: 1965-10-12
•
Expires: 1984-02-28
Abstract
No abstract record available.
Inventors
- 👤 Jr Edward A White
- 👤 Rodney E Grantham
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:51
CPC Classifications
F; F42; F42C; F42C15/00; F42C15/40
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-11 | 1969-04-12 | 1969-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-11 | 1973-04-12 | 1973-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-11 | 1977-04-12 | 1977-10-12 | $7700.00 | Window Closed / Lapsed |