US3263177A
Expired / Lapsed
US
⏱️ 0.0 years remaining
A.c. coupled amplifier offset storage and reset circuit
Assignee: Beckman Coulter Inc
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Filing: 1963-06-26
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Granted: 1966-07-26
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Expires: 1983-06-26
Abstract
No abstract record available.
Inventors
- 👤 Richard L Durrett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:16
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/30; H03F1/303
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
IN A POTENTIOMETERIC FEEDBACK AMPLIFIER INCLUDING A PREAMPLIFIER HAVING FIRST AND SECOND INPUT AND FIRST AND SECOND OUTPUT TERMINALS AND HAVING A FEEDBACK NETWORK CONNECTED BETWEEN SAID INPUT AND OUTPUT TERMINALS, A POST AMPLIFIER HAVING FIRST AND SECOND INPUT AND FIRST AND SECOND OUTPUT TERMINALS AND A FEEDBACK NETWORK CONNECTED BETWEEN SAID SECOND INPUT AND FIRST OUTPUT TERMINALS OF SAID POST AMPLIFIER, THE INPUT TERMINALS OF SAID PREAMPLIFIER SERVING AS THE INPUT TERMINALS OF THE POTENTIOMETRIC FEEDBACK AMPLIFIER, AND THE OUTPUT TERMINALS OF SAID POST AMPLIFIER SERVING AS THE OUTPUT TERMINALS OF SAID POTENTIOMETRIC FEEDBACK AMPLIFIER, THE IMPROVEMENT COMPRISING A CAPACITOR CONNECTED IN SERIES BETWEEN AN OUTPUT TERMINAL OF SAID PREAMPLIFIER AND SAID FIRST INPUT TERMINAL OF SAID POST AMPLIFIER, AND A SWITCH CONNECTED BETWEEN SAID FIRST OUTPUT TERMINAL OF SAID POST AMPLIFIER AND SAID FIRST INPUT TERMINAL OF SAID POST AMPLIFIER, WHEREBY SAID CAPACITOR SERVES TO STORE OFFSET VOLTAGES IN SAID POTENTIOMETRIC FEEDBACK AMPLIFIER TO CAUSE THE OUTPUT VOLTAGE ACROSS THE OUTPUT TERMINALS THEREOF TO EQUAL SUBSTANTIALLY ZERO WHEN SAID SWITCH IS CLOSED.
Claim 2
Dependent Claim
174 words
IN A POTENTIOMETERIC FEEDBACK AMPLIFIER INCLUDING A PREAMPLIFIER HAVING FIRST AND SECOND INPUT AND FIRST AND SECOND OUTPUT TERMINALS AND HAVING A FEEDBACK NETWORK CONNECTED BETWEEN SAID INPUT AND OUTPUT TERMINALS, A POST AMPLIFIER HAVING FIRST AND SECOND INPUT AND FIRST AND SECOND OUTPUT TERMINALS AND A FEEDBACK NETWORK CONNECTED BETWEEN SAID SECOND INPUT AND FIRST OUTPUT TERMINALS OF SAID POST AMPLIFIER, THE INPUT TERMINALS OF SAID PREAMPLIFIER SERVING AS THE INPUT TERMINALS OF THE POTENTIOMETRIC FEEDBACK AMPLIFIER, AND THE OUTPUT TERMINALS OF SAID POST AMPLIFIER SERVING AS THE OUTPUT TERMINALS OF SAID POTENTIOMETRIC FEEDBACK AMPLIFIER, THE IMPROVEMENT COMPRISING A CAPACITOR CONNECTED IN SERIES BETWEEN AN OUTPUT TERMINAL OF SAID PREAMPLIFIER AND SAID FIRST INPUT TERMINAL OF SAID POST AMPLIFIER, AND A SWITCH CONNECTED BETWEEN SAID FIRST OUTPUT TERMINAL OF SAID POST AMPLIFIER AND SAID FIRST INPUT TERMINAL OF SAID POST AMPLIFIER, WHEREBY SAID CAPACITOR SERVES TO STORE OFFSET VOLTAGES IN SAID POTENTIOMETRIC FEEDBACK AMPLIFIER TO CAUSE THE OUTPUT VOLTAGE ACROSS THE OUTPUT TERMINALS THEREOF TO EQUAL SUBSTANTIALLY ZERO WHEN SAID SWITCH IS CLOSED.
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) | 1969-07-25 | 1970-01-24 | 1970-07-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-07-25 | 1974-01-24 | 1974-07-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-07-25 | 1978-01-24 | 1978-07-26 | $7700.00 | Window Closed / Lapsed |