US3467836A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bilateral electronic switching circuit employing light-sensitive control element and fet input
Assignee: Beckman Coulter Inc
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Filing: 1966-05-20
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Granted: 1969-09-16
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Expires: 1986-05-20
Abstract
No abstract record available.
Inventors
- 👤 Walter C Thomas
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 10:11
CPC Classifications
H; H03; H03K; H03K17/00; H03K17/08; H03K17/081; H03K17/0814; H03K17/08146; H03K17/51; H03K17/56; H03K17/60; H03K17/68; H03K17/687; H03K17/78; H03K17/795
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
147 words
A SWITCHING CIRCUIT FOR SELECTIVELY CONNECTING AN OUTPUT TERMINAL TO AN INPUT TERMINAL COMPRISING A BILATERAL SEMICONDUCTOR SWITCH HAVING A FIRST ELECTRODE CONNECTED TO SAID INPUT TERMINAL, A SECOND ELECTRODE CONNECTED TO SAID OUTPUT TERMINAL, AND OTHER ELECTRODES CONNECTED TO A PAIR OF CONTROL TERMINALS, A SOURCE OF BIAS POTENTIAL INCLUDING A PHOTOVOLTAIC CELL CONNECTED IN SERIES BETWEEN SAID CONTROL TERMINALS OF SAID SEMICONDUCTOR SWITCH AND A SOURCE OF LIGHT OPTICALLY COUPLED THERETO, THE POLARITY AND AMPLITUDE OF SAID BIAS POTENTIAL BEING SO SELECTED AS TO PROVIDE A BIAS CURRENT FOR ESTABLISHING A LOW IMPEDANCE STATE IN SAID BILATERAL SEMICONDUCTOR SWITCH BETWEEN SAID INPUT AND OUTPUT TERMINALS, CONTROL MEANS FOR INTERRUPTING SAID BIAS CURRENT IN RESPONSE TO A CONTROL SIGNAL, AND MEANS COUPLING A CONTROL SIGNAL TO SAID CONTROL MEANS WHEREBY SAID BIAS CURRENT MAY BE CONTROLLED TO SELECTIVELY CONNECT SAID OUTPUT TERMINAL TO SAID INPUT TERMINAL.
Claim 2
Dependent Claim
147 words
A SWITCHING CIRCUIT FOR SELECTIVELY CONNECTING AN OUTPUT TERMINAL TO AN INPUT TERMINAL COMPRISING A BILATERAL SEMICONDUCTOR SWITCH HAVING A FIRST ELECTRODE CONNECTED TO SAID INPUT TERMINAL, A SECOND ELECTRODE CONNECTED TO SAID OUTPUT TERMINAL, AND OTHER ELECTRODES CONNECTED TO A PAIR OF CONTROL TERMINALS, A SOURCE OF BIAS POTENTIAL INCLUDING A PHOTOVOLTAIC CELL CONNECTED IN SERIES BETWEEN SAID CONTROL TERMINALS OF SAID SEMICONDUCTOR SWITCH AND A SOURCE OF LIGHT OPTICALLY COUPLED THERETO, THE POLARITY AND AMPLITUDE OF SAID BIAS POTENTIAL BEING SO SELECTED AS TO PROVIDE A BIAS CURRENT FOR ESTABLISHING A LOW IMPEDANCE STATE IN SAID BILATERAL SEMICONDUCTOR SWITCH BETWEEN SAID INPUT AND OUTPUT TERMINALS, CONTROL MEANS FOR INTERRUPTING SAID BIAS CURRENT IN RESPONSE TO A CONTROL SIGNAL, AND MEANS COUPLING A CONTROL SIGNAL TO SAID CONTROL MEANS WHEREBY SAID BIAS CURRENT MAY BE CONTROLLED TO SELECTIVELY CONNECT SAID OUTPUT TERMINAL TO SAID INPUT TERMINAL.
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) | 1972-09-15 | 1973-03-17 | 1973-09-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-09-15 | 1977-03-17 | 1977-09-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-09-15 | 1981-03-17 | 1981-09-16 | $7700.00 | Window Closed / Lapsed |