US3439187A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Antilogarithmic function generator
Assignee: United States Atomic Energy Commission
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Filing: 1966-08-02
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Granted: 1969-04-15
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Expires: 1986-08-02
Abstract
No abstract record available.
Inventors
- 👤 Michael G Strauss
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 22:45
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
166 words
AN ANTILOGARITHMIC FUNCTION GENERATOR FOR AN INPUT LOGARITHMIC PULSE COMPRISING A FIRST TRIODE TRANSISTOR HAVING AN ELECTRICALLY GROUNDED EMITTER, MEANS FOR APPLYING SAID INPUT LOGARITHMIC PULSE TO THE BASE OF SAID TRANSISTOR, THE OUTPUT OF SAID TRANSISTOR BEING TAKEN FOR THE COLLECTOR THEREOF TO PROVIDE A SIGNAL PROPORTIONAL TO THE ANTILOGARITHM OF SAID INPUT PULSE, MEANS FOR GENERATING A QUIESCENT REFERENCE FIRST CURRENT, MEANS FOR APPLYING SAID FIRST CURRENT TO THE COLLECTOR OF SAID TRANSISTOR, MEANS FOR GENERATING A REFERENCE SECOND CURRENT EQUAL TO BE QUIESCENT VALUE OF SAID FIRST CURRENT MEANS FOR GENERATING A SIGNAL PORPORTIONAL TO A DIFFERENCE IN VALUE BETWEEN SAID FIRST AND SECOND CURRENTS, MEANS RESPONSIVE TO SAID GENERATED SIGNAL FOR REGULATING IN THE ABSENCE OF SAID INPUT LOGARITHMIC PULSE THE VALUE OF SAID FIRST CURRENT, MEANS FOR GENERATING A THIRD CURRENT EQUAL TO THE QUIESCENT VALUE OF SAID FIRST CURRENT, AND MEANS FOR APPLYING SAID THIRD CURRENT TO THE COLLECTOR OF SAID TRANSISTOR IN THE PRESENCE OF SAID INPUT LOGARITHMIC PULSE.
Claim 2
Dependent Claim
166 words
AN ANTILOGARITHMIC FUNCTION GENERATOR FOR AN INPUT LOGARITHMIC PULSE COMPRISING A FIRST TRIODE TRANSISTOR HAVING AN ELECTRICALLY GROUNDED EMITTER, MEANS FOR APPLYING SAID INPUT LOGARITHMIC PULSE TO THE BASE OF SAID TRANSISTOR, THE OUTPUT OF SAID TRANSISTOR BEING TAKEN FOR THE COLLECTOR THEREOF TO PROVIDE A SIGNAL PROPORTIONAL TO THE ANTILOGARITHM OF SAID INPUT PULSE, MEANS FOR GENERATING A QUIESCENT REFERENCE FIRST CURRENT, MEANS FOR APPLYING SAID FIRST CURRENT TO THE COLLECTOR OF SAID TRANSISTOR, MEANS FOR GENERATING A REFERENCE SECOND CURRENT EQUAL TO BE QUIESCENT VALUE OF SAID FIRST CURRENT MEANS FOR GENERATING A SIGNAL PORPORTIONAL TO A DIFFERENCE IN VALUE BETWEEN SAID FIRST AND SECOND CURRENTS, MEANS RESPONSIVE TO SAID GENERATED SIGNAL FOR REGULATING IN THE ABSENCE OF SAID INPUT LOGARITHMIC PULSE THE VALUE OF SAID FIRST CURRENT, MEANS FOR GENERATING A THIRD CURRENT EQUAL TO THE QUIESCENT VALUE OF SAID FIRST CURRENT, AND MEANS FOR APPLYING SAID THIRD CURRENT TO THE COLLECTOR OF SAID TRANSISTOR IN THE PRESENCE OF SAID INPUT LOGARITHMIC PULSE.
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) | 1972-04-14 | 1972-10-14 | 1973-04-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-04-14 | 1976-10-14 | 1977-04-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-04-14 | 1980-10-14 | 1981-04-15 | $7700.00 | Window Closed / Lapsed |