Patent US3159741A successfully refreshed from Google Patents.
US3159741A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low noise electronic differentiator
Assignee: Honeywell Inc
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Filing: 1959-03-27
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Granted: 1964-12-01
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Expires: 1979-03-27
Abstract
No abstract record available.
Inventors
- 👤 Erik B Dahlin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 14:59
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/18; G06G7/184; G06G7/186
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
141 words
A DIFFERENTIATING DEVICE COMPRISING, IN COMBINATION, A FIRST OPERATIONAL AMPLIFIER, A SECOND OPERATIONAL AMPLIFIER, AN ELECTRONIC INTEGRATOR, A NEGATIVE FEEDBACK CIRCUIT CONNECTED AROUND SAID FIRST AMPLIFIER, SAID FEEDBACK CIRCUIT INCLUDING A SERIAL CONNECTION OF SAID SECOND AMPLIFIER AND SAID INTEGRATOR, A PAIR OF INPUT TERMINALS FOR CONNECTING TO A SOURCE OF INPUT SIGNALS, MEANS FOR CONNECTING AN OUTPUT SIGNAL FORM A DIFFERENCE SIGNAL AS AN INSAID INPUT SIGNALS TO FORM A DIFFERENCE SIGNAL AS AN INPUT SIGNAL TO SAID FIRST AMPLIFIER, A THIRD OPERATIONAL AMPLIFIER, MEANS FOR CONNECTING AN OUTPUT FROM SAID FIRST AMPLIFIER AS AN INPUT SIGNAL TO SAID THIRD AMPLIFIER, A PAIR OF OUTPUT TERMINALS, MEANS FOR CONNECTING AN OUTPUT SIGNAL FROM SAID THIRD AMPLIFIER TO SAID OUTPUT TERMINALS, AND MEANS FOR SIMULTANEOUSLY VARYING SAID OUTPUT SIGNAL FROM SAID THIRD AMPLIFIER AND AN OUTPUT SIGNAL FROM SAID SECOND AMPLIFIER.
Claim 2
Dependent Claim
141 words
A DIFFERENTIATING DEVICE COMPRISING, IN COMBINATION, A FIRST OPERATIONAL AMPLIFIER, A SECOND OPERATIONAL AMPLIFIER, AN ELECTRONIC INTEGRATOR, A NEGATIVE FEEDBACK CIRCUIT CONNECTED AROUND SAID FIRST AMPLIFIER, SAID FEEDBACK CIRCUIT INCLUDING A SERIAL CONNECTION OF SAID SECOND AMPLIFIER AND SAID INTEGRATOR, A PAIR OF INPUT TERMINALS FOR CONNECTING TO A SOURCE OF INPUT SIGNALS, MEANS FOR CONNECTING AN OUTPUT SIGNAL FORM A DIFFERENCE SIGNAL AS AN INSAID INPUT SIGNALS TO FORM A DIFFERENCE SIGNAL AS AN INPUT SIGNAL TO SAID FIRST AMPLIFIER, A THIRD OPERATIONAL AMPLIFIER, MEANS FOR CONNECTING AN OUTPUT FROM SAID FIRST AMPLIFIER AS AN INPUT SIGNAL TO SAID THIRD AMPLIFIER, A PAIR OF OUTPUT TERMINALS, MEANS FOR CONNECTING AN OUTPUT SIGNAL FROM SAID THIRD AMPLIFIER TO SAID OUTPUT TERMINALS, AND MEANS FOR SIMULTANEOUSLY VARYING SAID OUTPUT SIGNAL FROM SAID THIRD AMPLIFIER AND AN OUTPUT SIGNAL FROM SAID SECOND AMPLIFIER.
References Cited (Backward Citations)
US2457214A
Cited
US2464708A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-12-01 | 1968-06-01 | 1968-12-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-12-01 | 1972-06-01 | 1972-12-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-12-01 | 1976-06-01 | 1976-12-01 | $7700.00 | Window Closed / Lapsed |