Patent US3228023A successfully refreshed from Google Patents.
US3228023A
Expired / Lapsed
US
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Digitally controlled amplifier
Assignee: Beckman Coulter Inc
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Filing: 1962-06-14
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Granted: 1966-01-04
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Expires: 1982-06-14
Abstract
No abstract record available.
Inventors
- 👤 Hinrichs Karl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:06
CPC Classifications
H; H03; H03M; H03M1/00; H03M1/12; H03M1/50
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
82 words
AN AMPLIFIER HAVING AN INPUT AND OUTPUT, A CIRCUIT CONNECTED FROM THE OUTPUT TO THE INPUT OF SAID AMPLIFIER TO SUPPLY A FEEDBACK SIGNAL FROM SAID OUTPUT TO SAID INPUT, THE IMPROVEMENT COMPRISING A DIGITAL-TO-ANALOG CONVERTER HAVING AN ANALOG VOLTAGE INPUT AND A DIGITAL INPUT, AND CONNECTED WITH SAID CIRCUIT TO ADD TO OR SUBTRACT FROM SAID FEEDBACK SIGNAL AND A DIGITALLY CONTROLLED POTENTIOMETER HAVING A DIGITAL INPUT AND BEING CONNECTED IN SAID CIRCUIT TO VARY THE ATTENUATION OF SAID FEEDBACK SIGNAL.
Claim 2
Dependent Claim
82 words
AN AMPLIFIER HAVING AN INPUT AND OUTPUT, A CIRCUIT CONNECTED FROM THE OUTPUT TO THE INPUT OF SAID AMPLIFIER TO SUPPLY A FEEDBACK SIGNAL FROM SAID OUTPUT TO SAID INPUT, THE IMPROVEMENT COMPRISING A DIGITAL-TO-ANALOG CONVERTER HAVING AN ANALOG VOLTAGE INPUT AND A DIGITAL INPUT, AND CONNECTED WITH SAID CIRCUIT TO ADD TO OR SUBTRACT FROM SAID FEEDBACK SIGNAL AND A DIGITALLY CONTROLLED POTENTIOMETER HAVING A DIGITAL INPUT AND BEING CONNECTED IN SAID CIRCUIT TO VARY THE ATTENUATION OF SAID FEEDBACK SIGNAL.
References Cited (Backward Citations)
US3027079A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-01-03 | 1969-07-05 | 1970-01-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-01-03 | 1973-07-05 | 1974-01-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-01-03 | 1977-07-05 | 1978-01-04 | $7700.00 | Window Closed / Lapsed |