Patent US3390347A successfully refreshed from Google Patents.
US3390347A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Sample and hold circuit
Assignee: International Business Machines Corp
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Filing: 1966-01-10
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Granted: 1968-06-25
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Expires: 1986-01-10
Abstract
No abstract record available.
Inventors
- 👤 Jackie R Jones
- 👤 Ottesen Hjalmar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 20:06
CPC Classifications
G; G11; G11C; G11C27/00; G11C27/02; G11C27/024; G11C27/026
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
175 words
A SAMPLE AND HOLD CIRCUIT COMPRISING: A POTENTIOMETRIC AMPLIFIER HAVING FIRST AND SECOND INPUTS AND AN OUTPUT, SAID OUTPUT BEING CONNECTED THROUGH A FEEDBACK LOOP TO SAID SECOND INPUT; A STORAGE CAPACITOR; FIRST SWITCH MEANS CONNECTING SAID STORAGE CAPACITOR TO THE SECOND INPUT OF SAID POTENTIOMETRIC AMPLIFIER WHEN SAID CIRCUIT IS IN ITS SAMPLE MODE; SECOND SWITCH MEANS CONNECTING AN INPUT SIGNAL TO THE FIRST INPUT OF SAID POTENTIOMETRIC AMPLIFIER WHEN SAID CIRCUIT IS IN ITS SAMPLE MODE; AND THIRD SWITCH MEANS CONNECTING SAID STORAGE CAPACITOR TO THE FIRST INPUT OF SAID POTENTIOMETRIC AMPLIFIER WHEN SAID CIRCUIT IS IN ITS HOLD MODE; SAID POTENTIOMETRIC AMPLIFIER CHARGING SAID STORAGE CAPACITOR WHILE PRESENTING A HIGH IMPEDANCE TO THE INPUT SIGNAL WHEN SAID FIRST AND SECOND SWITCH MEANS ARE CLOSED AND SAID THIRD SWITCH MEANS IS OPEN TO PUT THE CIRCUIT IN ITS SAMPLE MODE, AND AMPLIFYING THE SIGNAL STORED BY SAID STORAGE CAPACITOR WHEN SAID FIRST AND SECOND SWITCH MEANS ARE OPEN AND SAID THIRD SWITCH MEANS IS CLOSED TO PUT THE CIRCUIT IN ITS HOLD MODE.
Claim 2
Dependent Claim
175 words
A SAMPLE AND HOLD CIRCUIT COMPRISING: A POTENTIOMETRIC AMPLIFIER HAVING FIRST AND SECOND INPUTS AND AN OUTPUT, SAID OUTPUT BEING CONNECTED THROUGH A FEEDBACK LOOP TO SAID SECOND INPUT; A STORAGE CAPACITOR; FIRST SWITCH MEANS CONNECTING SAID STORAGE CAPACITOR TO THE SECOND INPUT OF SAID POTENTIOMETRIC AMPLIFIER WHEN SAID CIRCUIT IS IN ITS SAMPLE MODE; SECOND SWITCH MEANS CONNECTING AN INPUT SIGNAL TO THE FIRST INPUT OF SAID POTENTIOMETRIC AMPLIFIER WHEN SAID CIRCUIT IS IN ITS SAMPLE MODE; AND THIRD SWITCH MEANS CONNECTING SAID STORAGE CAPACITOR TO THE FIRST INPUT OF SAID POTENTIOMETRIC AMPLIFIER WHEN SAID CIRCUIT IS IN ITS HOLD MODE; SAID POTENTIOMETRIC AMPLIFIER CHARGING SAID STORAGE CAPACITOR WHILE PRESENTING A HIGH IMPEDANCE TO THE INPUT SIGNAL WHEN SAID FIRST AND SECOND SWITCH MEANS ARE CLOSED AND SAID THIRD SWITCH MEANS IS OPEN TO PUT THE CIRCUIT IN ITS SAMPLE MODE, AND AMPLIFYING THE SIGNAL STORED BY SAID STORAGE CAPACITOR WHEN SAID FIRST AND SECOND SWITCH MEANS ARE OPEN AND SAID THIRD SWITCH MEANS IS CLOSED TO PUT THE CIRCUIT IN ITS HOLD MODE.
References Cited (Backward Citations)
US3116458A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1971-06-25 | 1971-12-25 | 1972-06-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-06-25 | 1975-12-25 | 1976-06-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-06-25 | 1979-12-25 | 1980-06-25 | $7700.00 | Window Closed / Lapsed |