Patent US3546589A successfully refreshed from Google Patents.
US3546589A
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Frequency characteristic shaping circuits
Assignee: International Standard Electric Corp
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Filing: 1967-06-01
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Granted: 1970-12-08
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Expires: 1987-06-01
Abstract
No abstract record available.
Inventors
- 👤 Michael John Gingell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 23:47
CPC Classifications
H; H03; H03D; H03D7/00; H04; H04J; H04J1/00; H04J1/02; H04J1/04; H03B; H03B21/00; H03B27/00; H03C; H03C1/00; H03C1/52; H03C1/60; H03D2200/00; H03D2200/0041; H03D2200/006; H03D2200/0066; H03D2200/0078; H03D7/16; H03D7/161; H03D7/163; H03D7/165
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1850569A
Cited
US2526425A
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US2527649A
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US2852606A
Cited
DE1023801B
Cited
US3205310A
Cited
US3081434A
Cited
US3406383A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-12-07 | 1974-06-08 | 1974-12-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-12-07 | 1978-06-08 | 1978-12-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-12-07 | 1982-06-08 | 1982-12-08 | $7700.00 | Window Closed / Lapsed |