US3076940A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency discriminator
Assignee: Gilfillan Bros Inc
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Filing: 1957-01-29
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Granted: 1963-02-05
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Expires: 1977-01-29
Abstract
No abstract record available.
Inventors
- 👤 Donovan C Davis
- 👤 Louis A Ule
- 👤 John R Stoltz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:50
CPC Classifications
H; H03; H03D; H03D3/00; H03D3/02; H03D3/06; H03D3/08; H03D3/10
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
89 words
A FREQUENCY DISCRIMINATOR COMPRISING: A HIGH-PASS FILTER FOR ATTENUATING AN INPUT SIGNAL SUBSTANTIALLY ONLY WHEN IT HAS A FREQUENCY BELOW A PREDETERMINED FREQUENCY; A LOW-PASS FILTER FOR ATTENUATING SAID INPUT SIGNAL SUBSTANTIALLY ONLY WHEN IT HAS A FREQUENCY ABOVE SAID PREDETERMINED FREQUENCY, BOTH OF SAID FILTERS BEING PROVIDED WITH MISMATCHED TERMINATIONS CONNECTED DIRECTLY IN PARALLEL WITH EACH CORRESPONDING FILTER; AND MEANS FOR COMBINING THE OUTPUTS OF BOTH OF SAID FILTERS TO PRODUCE A DIRECT-CURRENT VOLTAGE HAVING A PREDETERMINED POLARITY WHEN SAID INPUT SIGNAL HAS A FREQUENCY ABOVE SAID PRE-
Claim 2
Dependent Claim
89 words
A FREQUENCY DISCRIMINATOR COMPRISING: A HIGH-PASS FILTER FOR ATTENUATING AN INPUT SIGNAL SUBSTANTIALLY ONLY WHEN IT HAS A FREQUENCY BELOW A PREDETERMINED FREQUENCY; A LOW-PASS FILTER FOR ATTENUATING SAID INPUT SIGNAL SUBSTANTIALLY ONLY WHEN IT HAS A FREQUENCY ABOVE SAID PREDETERMINED FREQUENCY, BOTH OF SAID FILTERS BEING PROVIDED WITH MISMATCHED TERMINATIONS CONNECTED DIRECTLY IN PARALLEL WITH EACH CORRESPONDING FILTER; AND MEANS FOR COMBINING THE OUTPUTS OF BOTH OF SAID FILTERS TO PRODUCE A DIRECT-CURRENT VOLTAGE HAVING A PREDETERMINED POLARITY WHEN SAID INPUT SIGNAL HAS A FREQUENCY ABOVE SAID PRE-
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-02-04 | 1966-08-06 | 1967-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-02-04 | 1970-08-06 | 1971-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-02-04 | 1974-08-06 | 1975-02-05 | $7700.00 | Window Closed / Lapsed |