US3208003A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Negative resistance amplifier utilizing a directional filter
Assignee: RCA Corp
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Filing: 1961-03-24
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Granted: 1965-09-21
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Expires: 1981-03-24
Abstract
No abstract record available.
Inventors
- 👤 Sterzer Fred
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 18:36
CPC Classifications
H; H03; H03F; H03F3/00; H03F3/04; H03F3/10; H03F3/12
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
112 words
AN ELECTRICAL CIRCUIT COMPRISING IN COMBINATION A NEGATIVE RESISTANCE AMPLIFIER, A SIGNAL SOURCE CIRCUIT, A LOAD CIRCUIT, A FREQUENCY RESPONSIVE NETWORK HAVING A PLURALITY OF TERMINALS, SAID TERMINALS OF SAID NETWORK, A COUPLED TO A FIRST PAIR OF TERMINALS OF SAID NETWORK, A SECOND PAIR OF TERMINALS OF SAID NETWORK COUPLED AND SIGNAL SOURCE AND LOAD CIRCUITS, AND FIRST AND SECOND IMPEDANCE DEVICES COUPLED TO THIRD AND FOURTH PAIRS OF TERMINALS RESPECTIVELY OF SAID NETWORK, SAID FREQUENCY RESPONSIVE NETWORK EXHIBITING THE CHARACTERISTIC THAT OVER A PREDETERMINED BAND OF FREQUENCIES SAID FIRST AND SECOND PAIRS OF TERMINALS ARE ELECTRICALLY CONNECTED TO EACH OTHER BUT BOTH ARE ELECTRICALLY ISOLATED FROM SAID THIRD AND FOURTH
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) | 1968-09-20 | 1969-03-22 | 1969-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-20 | 1973-03-22 | 1973-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-20 | 1977-03-22 | 1977-09-21 | $7700.00 | Window Closed / Lapsed |