US3222528A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Multi-state photoconductive logic circuits
Assignee: International Business Machines Corp
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Filing: 1961-11-02
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Granted: 1965-12-07
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Expires: 1981-11-02
Abstract
No abstract record available.
Inventors
- 👤 Robert A Thorpe
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 08:34
CPC Classifications
H; H03; H03K; H03K19/00; H03K19/02; H03K19/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
170 words
A LOGICAL CIRCUIT ARRANGEMENT FOR PRODUCING DIFFERENT OUTPUTS IN RESPONSE TO DIFFERENT INPUT VOLTAGE LEVELS AT A SINGLE INPUT TERMINAL COMPRISING IN COMBINATION: FIRST AND SECOND NEGATIVE IMPEDANCE VOLTAGE RESPONSIVE LIGHT SOURCES FOR PRODUCING AN OPTICAL OUTPUT IN RESPONSE TO SAID INPUT VOLTAGE LEVELS; MEANS FOR CONNECTING SAID LIGHT SOURCES IN SERIES, SAID MEANS INCLUDING AN INTERMEDIATE CONNECTION BETWEEN SAID LIGHT SOURCES; A FIRST BIAS VOLTAGE SOURCE FOR PROVIDING A FIRST DIRECT CURRENT BIAS VOLTAGE LEVEL TO SAID FIRST LIGHT SOURCE; MEANS FOR CONNECTING SAID FIRST BIAS VOLTAGE SOURCE TO SAID FIRST LIGHT SOURCE; A SECOND BIAS VOLTAGE SOURCE FOR PROVIDING A SECOND DIRECT CURRENT BIAS VOLTAGE LEVEL TO SAID SECOND LIGHT SOURCE, SAID SECOND DIRECT CURRENT BIAS VOLTAGE LEVEL BEING EQUAL IN MAGNITUDE BUT OPPOSITE IN POLARITY TO SAID FIRST DIRECT CURRENT BIAS VOLTAGE LEVEL; MEANS FOR CONNECTING SAID SECOND BIAS VOLTAGE SOURCE TO SAID SECOND LIGHT SOURCE; MEANS FOR PROVIDING A FIRST INPUT VOLTAGE LEVEL HAVING A ZERO MAGNITUDE; MEANS FOR PROVIDING A SECOND INPUT VOLTAGE LEVEL HAV-
Claim 2
Dependent Claim
170 words
A LOGICAL CIRCUIT ARRANGEMENT FOR PRODUCING DIFFERENT OUTPUTS IN RESPONSE TO DIFFERENT INPUT VOLTAGE LEVELS AT A SINGLE INPUT TERMINAL COMPRISING IN COMBINATION: FIRST AND SECOND NEGATIVE IMPEDANCE VOLTAGE RESPONSIVE LIGHT SOURCES FOR PRODUCING AN OPTICAL OUTPUT IN RESPONSE TO SAID INPUT VOLTAGE LEVELS; MEANS FOR CONNECTING SAID LIGHT SOURCES IN SERIES, SAID MEANS INCLUDING AN INTERMEDIATE CONNECTION BETWEEN SAID LIGHT SOURCES; A FIRST BIAS VOLTAGE SOURCE FOR PROVIDING A FIRST DIRECT CURRENT BIAS VOLTAGE LEVEL TO SAID FIRST LIGHT SOURCE; MEANS FOR CONNECTING SAID FIRST BIAS VOLTAGE SOURCE TO SAID FIRST LIGHT SOURCE; A SECOND BIAS VOLTAGE SOURCE FOR PROVIDING A SECOND DIRECT CURRENT BIAS VOLTAGE LEVEL TO SAID SECOND LIGHT SOURCE, SAID SECOND DIRECT CURRENT BIAS VOLTAGE LEVEL BEING EQUAL IN MAGNITUDE BUT OPPOSITE IN POLARITY TO SAID FIRST DIRECT CURRENT BIAS VOLTAGE LEVEL; MEANS FOR CONNECTING SAID SECOND BIAS VOLTAGE SOURCE TO SAID SECOND LIGHT SOURCE; MEANS FOR PROVIDING A FIRST INPUT VOLTAGE LEVEL HAVING A ZERO MAGNITUDE; MEANS FOR PROVIDING A SECOND INPUT VOLTAGE LEVEL HAV-
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) | 1968-12-06 | 1969-06-07 | 1969-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-06 | 1973-06-07 | 1973-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-06 | 1977-06-07 | 1977-12-07 | $7700.00 | Window Closed / Lapsed |