US2677809A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical wave filter
Assignee: International Standard Electric Corp
•
Filing: 1949-10-10
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Granted: 1954-05-04
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Expires: 1969-10-10
Abstract
No abstract record available.
Inventors
- 👤 Ervin M Bradburd
- 👤 Robert S Alter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 21:41
CPC Classifications
H; H04; H04J; H04J1/00; H04J1/02; H04J1/08; H01; H01P; H01P1/00; H01P1/20; H01P1/201; H01P1/202; H03; H03H; H03H7/00; H03H7/01; H03H7/0115; H03H7/17; H03H7/1741; H03H7/1758
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US248742A
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US1493600A
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US2066674A
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US2132208A
Cited
US2290508A
Cited
US2284529A
Cited
GB590474A
Cited
GB609231A
Cited
US2515061A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-05-03 | 1957-11-02 | 1958-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-05-03 | 1961-11-02 | 1962-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-05-03 | 1965-11-02 | 1966-05-04 | $7700.00 | Window Closed / Lapsed |