Patent US3100282A successfully refreshed from Google Patents.
US3100282A
Expired / Lapsed
US
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Shielding amplifier circuit
Assignee: Beckman Coulter Inc
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Filing: 1958-10-29
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Granted: 1963-08-06
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Expires: 1978-10-29
Abstract
No abstract record available.
Inventors
- 👤 Taylor C Fletcher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 03:57
CPC Classifications
H; H03; H03F; H03F1/00; H03F1/30
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
IN A FLOATING SYSTEM FOR MEASURING DIRECT CURRENT VOLTAGES, THE COMBINATION OF: AN UNGROUNDED TRANSDUCER HAVING SIGNAL LEADS; SAID TRANSDUCER PRODUCING INPUT SIGNALS; A FEEDBACK AMPLIFIER HAVING AN INPUT AND AN OUTPUT; A FILTER NETWORK CONNECTED TO THE INPUT OF SAID FEEDBACK AMPLIFIER FOR ATTENUATING A.-C. INPUT SIGNALS; A VOLTAGE DIVIDING NETWORK CONNECTED TO THE OUTPUT OF SAID FEEDBACK AMPLIFIER FOR PRODUCING A FEEDBACK SIGNAL; MEANS CONNECTING SAID TRANSDUCER TO SAID FILTER AND TO SAID VOLTAGE DIVIDING NETWORK FOR PROVIDING A FEEDBACK LOOP, WHEREBY THE FEEDBACK SIGNAL AND TRANSDUCER SIGNAL ARE COMBINED TO FORM ERROR VOLTAGES; AN UNGROUNDED SHIELDING MEANS FOR SHIELDING SAID AMPLIFIER FROM THE INFLUENCE OF EXTERNAL ELECTROSTATIC AND ELECTROMAGNETIC FIELDS; AND A LEAD ELECTRICALLY CONNECTING SAID SHIELDING MEANS TO ONE OF THE SIGNAL LEADS OF SAID TRANSDUCER.
Claim 2
Dependent Claim
130 words
IN A FLOATING SYSTEM FOR MEASURING DIRECT CURRENT VOLTAGES, THE COMBINATION OF: AN UNGROUNDED TRANSDUCER HAVING SIGNAL LEADS; SAID TRANSDUCER PRODUCING INPUT SIGNALS; A FEEDBACK AMPLIFIER HAVING AN INPUT AND AN OUTPUT; A FILTER NETWORK CONNECTED TO THE INPUT OF SAID FEEDBACK AMPLIFIER FOR ATTENUATING A.-C. INPUT SIGNALS; A VOLTAGE DIVIDING NETWORK CONNECTED TO THE OUTPUT OF SAID FEEDBACK AMPLIFIER FOR PRODUCING A FEEDBACK SIGNAL; MEANS CONNECTING SAID TRANSDUCER TO SAID FILTER AND TO SAID VOLTAGE DIVIDING NETWORK FOR PROVIDING A FEEDBACK LOOP, WHEREBY THE FEEDBACK SIGNAL AND TRANSDUCER SIGNAL ARE COMBINED TO FORM ERROR VOLTAGES; AN UNGROUNDED SHIELDING MEANS FOR SHIELDING SAID AMPLIFIER FROM THE INFLUENCE OF EXTERNAL ELECTROSTATIC AND ELECTROMAGNETIC FIELDS; AND A LEAD ELECTRICALLY CONNECTING SAID SHIELDING MEANS TO ONE OF THE SIGNAL LEADS OF SAID TRANSDUCER.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-08-05 | 1967-02-04 | 1967-08-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-08-05 | 1971-02-04 | 1971-08-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-08-05 | 1975-02-04 | 1975-08-06 | $7700.00 | Window Closed / Lapsed |