US2737629A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Equalizer arrangement with an attenuation characteristic proportional to frequency
Assignee: International Standard Electric Corp
•
Filing: 1950-04-05
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Granted: 1956-03-06
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Expires: 1970-04-05
Abstract
No abstract record available.
Inventors
- 👤 Beerbaum Friedrich
- 👤 Grewe Theodor
- 👤 Steinbuch Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 03:35
CPC Classifications
H; H03; H03H; H03H5/00; H03H5/006; H04; H04B; H04B3/00; H04B3/02; H04B3/04; H04B3/14; H04B3/143; H04B3/145
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1478078A
Cited
US1591073A
Cited
US1911253A
Cited
US1850146A
Cited
US2096027A
Cited
US2171649A
Cited
US2636940A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1959-03-06 | 1959-09-05 | 1960-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1963-03-06 | 1963-09-05 | 1964-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1967-03-06 | 1967-09-05 | 1968-03-06 | $7700.00 | Window Closed / Lapsed |