US2491681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric filter
Assignee: MEASUREMENTS Corp
•
Filing: 1944-12-11
•
Granted: 1949-12-20
•
Expires: 1964-12-11
Abstract
No abstract record available.
Inventors
- 👤 Nd Jerry B Minter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 05:06
CPC Classifications
H; H03; H03H; H03H7/00; H03H7/01; H03H7/0138; H03H7/0146; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/202
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2129713A
Cited
US1571501A
Cited
US2109843A
Cited
US2158493A
Cited
US2163775A
Cited
US2221105A
Cited
US2258261A
Cited
US2283568A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-19 | 1953-06-20 | 1953-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-19 | 1957-06-20 | 1957-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-19 | 1961-06-20 | 1961-12-20 | $7700.00 | Window Closed / Lapsed |