Patent US3543009A successfully refreshed from Google Patents.
US3543009A
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US
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Binary transversal filter systems
Assignee: Research Corp
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Filing: 1967-09-05
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Granted: 1970-11-24
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Expires: 1987-09-05
Abstract
No abstract record available.
Inventors
- 👤 Herbert B Voelcker Jr
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:36
CPC Classifications
H; H03; H03H; H03H17/00; H03H17/02; H03H17/06; H03H17/0621; H04; H04L; H04L25/00; H04L25/02; H04L25/03; H04L25/03006; H04L25/03012; H04L25/03114; H04L25/03133
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3110802A
Cited
US3050700A
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US3050714A
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US3303335A
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US3297951A
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US3315171A
Cited
US3348150A
Cited
US3432649A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-11-23 | 1974-05-25 | 1974-11-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-23 | 1978-05-25 | 1978-11-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-23 | 1982-05-25 | 1982-11-24 | $7700.00 | Window Closed / Lapsed |