US3210530A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Logarithmic converter
Assignee: HOUSTON INSTRUMENT CORP
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Filing: 1961-09-13
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Granted: 1965-10-05
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Expires: 1981-09-13
Abstract
No abstract record available.
Inventors
- 👤 Frank R Bravenec
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 20:36
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/26; G06G7/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
109 words
A LOGARITHMIC CONVERTER COMPRISING A NETWORK HAVING INPUT AND OUTPUT TERMINALS AND ALSO HAVING RESISTIVE IMPEDANCE COMPONENTS AT LEAST TWO OF WHICH ARE VARIABLE LINEAR RESISTIVE ELEMENTS CONNECTED SO THAT A FIRST ELEMENT VARIES THE VOLTAGE APPLIED TO A SECOND ELEMENT AND THE LATTER IN TURN VARIES THE PORTION FO THE VOLTAGE APPLIED THERETO WHICH IS TO BE IMPRESSED ACROSS THE OUTPUT TERMINALS, A CONTROL ELEMENT, AND ANON-LINEAR MEANS INTERCONNECTING THE CONTROL ELEMENT WITH SAID LINEAR RESISTIVE ELEMENTS SUCH THAT LINEAR VARIATION OF THE CONTROL ELEMENT CAUSES THE RESISTIVE ELEMENTS TO VARY THEIR RESPECTIVE VOLTAGE OUTPUTS SUCH THAT THE LOGARITHM OF THE TRANSFER FUNCTION OF THE NETWORK VARIES LINEARLY.
Claim 2
Dependent Claim
109 words
A LOGARITHMIC CONVERTER COMPRISING A NETWORK HAVING INPUT AND OUTPUT TERMINALS AND ALSO HAVING RESISTIVE IMPEDANCE COMPONENTS AT LEAST TWO OF WHICH ARE VARIABLE LINEAR RESISTIVE ELEMENTS CONNECTED SO THAT A FIRST ELEMENT VARIES THE VOLTAGE APPLIED TO A SECOND ELEMENT AND THE LATTER IN TURN VARIES THE PORTION FO THE VOLTAGE APPLIED THERETO WHICH IS TO BE IMPRESSED ACROSS THE OUTPUT TERMINALS, A CONTROL ELEMENT, AND ANON-LINEAR MEANS INTERCONNECTING THE CONTROL ELEMENT WITH SAID LINEAR RESISTIVE ELEMENTS SUCH THAT LINEAR VARIATION OF THE CONTROL ELEMENT CAUSES THE RESISTIVE ELEMENTS TO VARY THEIR RESPECTIVE VOLTAGE OUTPUTS SUCH THAT THE LOGARITHM OF THE TRANSFER FUNCTION OF THE NETWORK VARIES LINEARLY.
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) | 1968-10-04 | 1969-04-05 | 1969-10-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-04 | 1973-04-05 | 1973-10-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-04 | 1977-04-05 | 1977-10-05 | $7700.00 | Window Closed / Lapsed |