US3197565A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Low-level multiplex system with independently variable gain on each channel
Assignee: SYSTEMS ENGINEERING LAB Inc
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Filing: 1961-09-25
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Granted: 1965-07-27
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Expires: 1981-09-25
Abstract
No abstract record available.
Inventors
- 👤 David C Yoder
- 👤 John H Searcy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:48
CPC Classifications
G; G08; G08C; G08C15/00; G08C15/06
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
129 words
A MULTIPLEX SYSTEM COMPRISING A PLURALITY OF SIGNAL CHANNELS EACH ADAPTED TO BE COUPLED TO A LOW LEVEL D.C. SIGNAL SOURCE AND EACH INCLUDING MEANS TO CONVERT A D.C. SIGNAL TO A CORRESPONDING ALTERNATING SIGNAL, AN A.C. AMPLIFIER MEANS, COUPLING THE ALTERNATING SIGNAL OUTPUTS FROM SAID SIGNAL CHANNELS IN COMMON TO THE INPUT OF SAID A.C. AMPLIFIER MEANS, A FEED-BACK IMPEDANCE COUPLING THE OUTPUT OF SAID A.C. AMPLIFIER MEANS WITH THE INPUT TO SAID A.C. AMPLIFIER MEANS, GAIN CONTROL MEANS COUPLED TO THE INPUT OF SAID A.C. AMPLIFIER MEANS AND A POINT OF REFERENCE POTENTIAL, SWITCH MEANS FOR SEQUENTIALLY COUPLING SAID CHANNELS WITH SAID A.C. AMPLIFIER MEANS, AND MEANS OPERATING SAID GAIN CONTROL MEANS TO SET THE GAIN OF SAID A.C. AMPLIFIER MEANS A SYNCHRONISM WITH SAID SWITCH MEANS.
Claim 2
Dependent Claim
129 words
A MULTIPLEX SYSTEM COMPRISING A PLURALITY OF SIGNAL CHANNELS EACH ADAPTED TO BE COUPLED TO A LOW LEVEL D.C. SIGNAL SOURCE AND EACH INCLUDING MEANS TO CONVERT A D.C. SIGNAL TO A CORRESPONDING ALTERNATING SIGNAL, AN A.C. AMPLIFIER MEANS, COUPLING THE ALTERNATING SIGNAL OUTPUTS FROM SAID SIGNAL CHANNELS IN COMMON TO THE INPUT OF SAID A.C. AMPLIFIER MEANS, A FEED-BACK IMPEDANCE COUPLING THE OUTPUT OF SAID A.C. AMPLIFIER MEANS WITH THE INPUT TO SAID A.C. AMPLIFIER MEANS, GAIN CONTROL MEANS COUPLED TO THE INPUT OF SAID A.C. AMPLIFIER MEANS AND A POINT OF REFERENCE POTENTIAL, SWITCH MEANS FOR SEQUENTIALLY COUPLING SAID CHANNELS WITH SAID A.C. AMPLIFIER MEANS, AND MEANS OPERATING SAID GAIN CONTROL MEANS TO SET THE GAIN OF SAID A.C. AMPLIFIER MEANS A SYNCHRONISM WITH SAID SWITCH MEANS.
References Cited (Backward Citations)
US2757283A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-07-26 | 1969-01-25 | 1969-07-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-07-26 | 1973-01-25 | 1973-07-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-07-26 | 1977-01-25 | 1977-07-27 | $7700.00 | Window Closed / Lapsed |