Patent US3384739A successfully refreshed from Google Patents.
US3384739A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Analog multiplier
Assignee: Massachusetts Institute of Technology
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Filing: 1964-09-23
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Granted: 1968-05-21
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Expires: 1984-09-23
Abstract
No abstract record available.
Inventors
- 👤 Mark E Connelly
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:24
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/16; G06G7/163
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
198 words
AN ANALOG MULITPLIER COMPRISING A FIRST AND SECOND VARIABLE RESISTANCE ELEMENT, A SINGLE CONCENTRATED INCANESCENT SOURCE OF RADIANT ENERGBY IMPINGING ON SAID FIRST AND SECOND RESISTANCE ELEMENTS, MEANS FOR ISOLATING SAID ELEMENTS FROM EXTRANEOUS RADIANT ENERGY, THE RESISTANCE OF EACH ELEMENT BEING SUBSTANTIALLY EQUAL AND DEPENDENT UPON THE INTENSITY OF SAID RADIANT ENERGY, A FIRST AND SECOND ELECTRICAL NETWORK INCLUDING SAID FIRST AND SECOND VARIABLE RESISTANCE ELEMENTS RESPECTIVELY, A SOURCE OF CONSTANT VOLTAGE APPLIED TO THE INPUT TERMINALS OF SAID FIRST NETWORK, SAID FIRST AND SECOND NETWORK EACH HAVING AN OUTPUT TERMINAL TO PROVIDE AN OUTPUT VOLTAGE RESPONSIVE TO ITS INPUT VOLTAGE AND TO THE RESISTANVE OF ITS VARIABLE RESISTANCE ELEMENT, A FIRST SIGNAL VOLTAGE, MEANS FOR AMPLIFYING THE DIFFERENCE OF SAID FIRST SIGNAL VOLTAGE AND SAID FIRST NETWORK OUTPUT VOLTAGE TO PROVIDE AN ENERGIZATION VOLTAGE TO SAID ENERGY SOURCE WHOSE MAGNITUDE IS DEPENDENT UPON THE MAGNITUDE OF SAID FIRST SIGNAL VOLTAGE, THE INTENSITY OF RADIANT ENERGY FROM SAID SOURCE BEING DEPENDENT UPON ITS ENERGIZATION VOLTAGE, A SECOND SIGNAL VOLTAGE APPLIED TO THE INPUT TERMINALS OF SAID SECOND NETWORK, THE VOLTAGE AT SAID SECOND NETWORK OUTPUT TERMINAL BEING PROPORTIONAL TO THE PRODUCT OF SAID FIRST AND SECOND VOLTAGES.
Claim 2
Dependent Claim
198 words
AN ANALOG MULITPLIER COMPRISING A FIRST AND SECOND VARIABLE RESISTANCE ELEMENT, A SINGLE CONCENTRATED INCANESCENT SOURCE OF RADIANT ENERGBY IMPINGING ON SAID FIRST AND SECOND RESISTANCE ELEMENTS, MEANS FOR ISOLATING SAID ELEMENTS FROM EXTRANEOUS RADIANT ENERGY, THE RESISTANCE OF EACH ELEMENT BEING SUBSTANTIALLY EQUAL AND DEPENDENT UPON THE INTENSITY OF SAID RADIANT ENERGY, A FIRST AND SECOND ELECTRICAL NETWORK INCLUDING SAID FIRST AND SECOND VARIABLE RESISTANCE ELEMENTS RESPECTIVELY, A SOURCE OF CONSTANT VOLTAGE APPLIED TO THE INPUT TERMINALS OF SAID FIRST NETWORK, SAID FIRST AND SECOND NETWORK EACH HAVING AN OUTPUT TERMINAL TO PROVIDE AN OUTPUT VOLTAGE RESPONSIVE TO ITS INPUT VOLTAGE AND TO THE RESISTANVE OF ITS VARIABLE RESISTANCE ELEMENT, A FIRST SIGNAL VOLTAGE, MEANS FOR AMPLIFYING THE DIFFERENCE OF SAID FIRST SIGNAL VOLTAGE AND SAID FIRST NETWORK OUTPUT VOLTAGE TO PROVIDE AN ENERGIZATION VOLTAGE TO SAID ENERGY SOURCE WHOSE MAGNITUDE IS DEPENDENT UPON THE MAGNITUDE OF SAID FIRST SIGNAL VOLTAGE, THE INTENSITY OF RADIANT ENERGY FROM SAID SOURCE BEING DEPENDENT UPON ITS ENERGIZATION VOLTAGE, A SECOND SIGNAL VOLTAGE APPLIED TO THE INPUT TERMINALS OF SAID SECOND NETWORK, THE VOLTAGE AT SAID SECOND NETWORK OUTPUT TERMINAL BEING PROPORTIONAL TO THE PRODUCT OF SAID FIRST AND SECOND VOLTAGES.
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) | 1971-05-21 | 1971-11-20 | 1972-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-05-21 | 1975-11-20 | 1976-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-05-21 | 1979-11-20 | 1980-05-21 | $7700.00 | Window Closed / Lapsed |