Patent US3404348A successfully refreshed from Google Patents.
US3404348A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low level signal limiter
Assignee: National Aeronautics and Space Administration
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Filing: 1966-09-22
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Granted: 1968-10-01
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Expires: 1986-09-22
Abstract
No abstract record available.
Inventors
- 👤 Irving G Hansen
- 👤 Victor S Peterson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:08
CPC Classifications
H; H03; H03G; H03G11/00; H03G11/02
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
186 words
IN A SIGNAL LIMITING CIRCUIT INCLUDING SIGNAL INPUT MEANS ADAPTED TO RECEIVE A SIGNAL FROM A TRANSDUCER AND SIGNAL OUTPUT MEANS ADAPTED FOR CONNECTION TO A SIGNAL AMPLIFIER, THE COMBINATION OF: ISOLATING MEANS CONNECTING SAID SIGNAL INPUT MEANS TO SAID SIGNAL OUTPUT MEANS; VOLTOPERATIONAL AMPLIFIER HAVING AN INPUT AND AN OUTPUT; VOLTAGE DROPPING MEANS CONNECTED BETWEEN SAID OPERATIONAL AMPLIFIER INPUT AND SAID SIGNAL OUTPUT MEANS TO ISOLATE THE VOLTAGE AT THE INPUT OF SAID OPERATIONAL AMPLIFIER FROM THE VOLTAGE AT SAID SIGNAL OUTPUT MEANS; A LINEAR FEEDBACK NETWORK CONNECTED BETWEEN SAID OUTPUT AND SAID INPUT OF SAID OPERATIONAL AMPLIFIER TO REDUCE THE VOLTAGE AT SAID INPUT OF SAID OPERATIONAL AMPLIFIER TO SUBSTANTIALLY ZERO WHEN THE VOLTAGE BETWEEN SAID SIGNAL OUTPUT TERMINALS IS BELOW A PREDETERMINED MAGNITUDE; AND, A NONLINEAR FEEDBACK NETWORK CONNECTED BETWEEN SAID OUTPUT OF SAID OPERATIONAL AMPLIFIER AND SAID SIGNAL OUTPUT MEANS WHEREBY, AS THE OUTPUT VOLTAGE OF SAID OPERATIONAL AMPLIFIER INCREASES, THE FEEDBACK TO SAID SIGNAL OUTPUT MEANS INCREASES FASTER THAN THE FEEDBACK TO SAID INPUT OF SAID OPERATIONAL AMPLIFIER TO LIMIT THE VOLTAGE AT SAID SIGNAL OUTPUT MEANS TO A PREDETERMINED VALUE.
Claim 2
Dependent Claim
186 words
IN A SIGNAL LIMITING CIRCUIT INCLUDING SIGNAL INPUT MEANS ADAPTED TO RECEIVE A SIGNAL FROM A TRANSDUCER AND SIGNAL OUTPUT MEANS ADAPTED FOR CONNECTION TO A SIGNAL AMPLIFIER, THE COMBINATION OF: ISOLATING MEANS CONNECTING SAID SIGNAL INPUT MEANS TO SAID SIGNAL OUTPUT MEANS; VOLTOPERATIONAL AMPLIFIER HAVING AN INPUT AND AN OUTPUT; VOLTAGE DROPPING MEANS CONNECTED BETWEEN SAID OPERATIONAL AMPLIFIER INPUT AND SAID SIGNAL OUTPUT MEANS TO ISOLATE THE VOLTAGE AT THE INPUT OF SAID OPERATIONAL AMPLIFIER FROM THE VOLTAGE AT SAID SIGNAL OUTPUT MEANS; A LINEAR FEEDBACK NETWORK CONNECTED BETWEEN SAID OUTPUT AND SAID INPUT OF SAID OPERATIONAL AMPLIFIER TO REDUCE THE VOLTAGE AT SAID INPUT OF SAID OPERATIONAL AMPLIFIER TO SUBSTANTIALLY ZERO WHEN THE VOLTAGE BETWEEN SAID SIGNAL OUTPUT TERMINALS IS BELOW A PREDETERMINED MAGNITUDE; AND, A NONLINEAR FEEDBACK NETWORK CONNECTED BETWEEN SAID OUTPUT OF SAID OPERATIONAL AMPLIFIER AND SAID SIGNAL OUTPUT MEANS WHEREBY, AS THE OUTPUT VOLTAGE OF SAID OPERATIONAL AMPLIFIER INCREASES, THE FEEDBACK TO SAID SIGNAL OUTPUT MEANS INCREASES FASTER THAN THE FEEDBACK TO SAID INPUT OF SAID OPERATIONAL AMPLIFIER TO LIMIT THE VOLTAGE AT SAID SIGNAL OUTPUT MEANS TO A PREDETERMINED VALUE.
References Cited (Backward Citations)
US3041535A
Cited
US3248569A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-10-01 | 1972-04-01 | 1972-10-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-01 | 1976-04-01 | 1976-10-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-01 | 1980-04-01 | 1980-10-01 | $7700.00 | Window Closed / Lapsed |