US2848713A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Highly discriminative filter and bias-level gating circuit
Assignee: Gilfillan Bros Inc
•
Filing: 1955-02-03
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Granted: 1958-08-19
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Expires: 1975-02-03
Abstract
No abstract record available.
Inventors
- 👤 Cowart Brooks Ehrmon
- 👤 Ball Lloyd David
- 👤 John I Daspit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:24
CPC Classifications
G; G01; G01S; G01S13/00; G01S13/02; G01S13/50; G01S13/58; G01S13/585
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US1968460A
Cited
US2269011A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-08-18 | 1962-02-17 | 1962-08-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-08-18 | 1966-02-17 | 1966-08-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-08-18 | 1970-02-17 | 1970-08-19 | $7700.00 | Window Closed / Lapsed |