US3129343A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Logarithmic function generator
Assignee: AT&T Inc
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Filing: 1961-12-13
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Granted: 1964-04-14
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Expires: 1981-12-13
Abstract
No abstract record available.
Inventors
- 👤 Ralph A Logan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 08:21
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/24; Y; Y10; Y10S; Y10S148/00; Y10S148/072
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
81 words
A LOGARITHMIC FUNCTION GENERATOR COMPRISING A HETEROJUNCION DEVICE FORMED OF MATERIALS OF THE SAME CONDUCTIVITY TYPE, ONE OF SAID MATERIALS HAVING A LARGER ENERGY GAP THAN THE OTHER, MEANS CONNECTED IN CIRCUIT WITH SAID DEVICE FOR APPLYING A POSITIVE VOLTAGE TO THE MATERIAL HAVING THE LARGER ENERGY GAP, SAID VOLTAGE VARYING IN ACCORDANCE WITH ONE APPLIED INPUT SIGNAL, AND MEANS CONNECTED TO SERIES WITH SAID DEVICE FOR EXTRACTING AN OUTPUT SIGNAL WHICH IS A LOGARITHMIC FUNCTION OF THE APPLIED INPUT SIGNAL.
Claim 2
Dependent Claim
81 words
A LOGARITHMIC FUNCTION GENERATOR COMPRISING A HETEROJUNCION DEVICE FORMED OF MATERIALS OF THE SAME CONDUCTIVITY TYPE, ONE OF SAID MATERIALS HAVING A LARGER ENERGY GAP THAN THE OTHER, MEANS CONNECTED IN CIRCUIT WITH SAID DEVICE FOR APPLYING A POSITIVE VOLTAGE TO THE MATERIAL HAVING THE LARGER ENERGY GAP, SAID VOLTAGE VARYING IN ACCORDANCE WITH ONE APPLIED INPUT SIGNAL, AND MEANS CONNECTED TO SERIES WITH SAID DEVICE FOR EXTRACTING AN OUTPUT SIGNAL WHICH IS A LOGARITHMIC FUNCTION OF THE APPLIED INPUT SIGNAL.
References Cited (Backward Citations)
US3037129A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1967-04-14 | 1967-10-14 | 1968-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-14 | 1971-10-14 | 1972-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-14 | 1975-10-14 | 1976-04-14 | $7700.00 | Window Closed / Lapsed |