Patent US3898655A successfully refreshed from Google Patents.
Patent US3224115A successfully refreshed from Google Patents.
US3224115A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Automatic muting system
Assignee: AV Electronics Inc
•
Filing: 1963-04-15
•
Granted: 1965-12-21
•
Expires: 1983-04-15
Abstract
No abstract record available.
Inventors
- 👤 Clarence L Auernheimer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 08:50
CPC Classifications
G; G09; G09B; G09B5/00; G09B5/08; G09B5/14
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
174 words
A TEACHING DEVICE COMPRISING AN AUDIO FREQUENCY SIGNAL SUPPLY MEANS, A STUDENT STATION CONNECTED TO THE SUPPLY MEANS TO RECEIVE THE SIGNAL, A FIRST RESISTOR IN SERIES WITH SAID SUPPLY MEANS, A GROUND LINE CONNECTED TO THE SIDE OF SAID RESISTOR OPPOSITE FROM SAID SUPPLY MEANS, A SECOND RESISTOR HAVING A GROUNDED VARIABLE RESISTANCE, SAID FIRST AND SECOND RESISTORS BEING CONNECTED TO SAID SIGNAL SUPPLY MEANS AS A VOLTAGE DIVIDER CIRCUIT, A RECORDER, CIRCUIT MEANS CONNECTED FROM SAID VOLTAGE DIVIDER CIRCUIT TO THE RECORDER, A MICROPHONE AT SAID STUDENT STATION, MEANS SUBSTANTIALLY MATCHING COOPERATIVELY WITH THE VOLTAGE DIVIDER CIRCUIT THE MICROPHONE OUTPUT VOLTAGE WITH THE OUTPUT VOLTAGE OF THE SUPPLY SIGNAL WHICH PASSES THROUGH SAID CIRCUIT MEANS, SO THAT SIGNALS FROM BOTH SOURCES MAY BE RECORDED ON THE RECORDER, A COMMUNICATION CIRCUIT CONNECTED TO THE STUDENT STATION AND INCLUDING A MICROPHONE AND A RECEIVER, TWO NORMALLY OPEN SWITCHES CONNECTED RESPECTIVELY IN SAID LINE TO GROUND AND IN THE COMMUNICATION CIRCUIT AT SAID MICROPHONE, AND MEANS OPERABLE TO CLOSE AND OPEN SAID SWITCHES IN UNISON.
Claim 2
Dependent Claim
174 words
A TEACHING DEVICE COMPRISING AN AUDIO FREQUENCY SIGNAL SUPPLY MEANS, A STUDENT STATION CONNECTED TO THE SUPPLY MEANS TO RECEIVE THE SIGNAL, A FIRST RESISTOR IN SERIES WITH SAID SUPPLY MEANS, A GROUND LINE CONNECTED TO THE SIDE OF SAID RESISTOR OPPOSITE FROM SAID SUPPLY MEANS, A SECOND RESISTOR HAVING A GROUNDED VARIABLE RESISTANCE, SAID FIRST AND SECOND RESISTORS BEING CONNECTED TO SAID SIGNAL SUPPLY MEANS AS A VOLTAGE DIVIDER CIRCUIT, A RECORDER, CIRCUIT MEANS CONNECTED FROM SAID VOLTAGE DIVIDER CIRCUIT TO THE RECORDER, A MICROPHONE AT SAID STUDENT STATION, MEANS SUBSTANTIALLY MATCHING COOPERATIVELY WITH THE VOLTAGE DIVIDER CIRCUIT THE MICROPHONE OUTPUT VOLTAGE WITH THE OUTPUT VOLTAGE OF THE SUPPLY SIGNAL WHICH PASSES THROUGH SAID CIRCUIT MEANS, SO THAT SIGNALS FROM BOTH SOURCES MAY BE RECORDED ON THE RECORDER, A COMMUNICATION CIRCUIT CONNECTED TO THE STUDENT STATION AND INCLUDING A MICROPHONE AND A RECEIVER, TWO NORMALLY OPEN SWITCHES CONNECTED RESPECTIVELY IN SAID LINE TO GROUND AND IN THE COMMUNICATION CIRCUIT AT SAID MICROPHONE, AND MEANS OPERABLE TO CLOSE AND OPEN SAID SWITCHES IN UNISON.
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) | 1968-12-20 | 1969-06-21 | 1969-12-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-20 | 1973-06-21 | 1973-12-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-20 | 1977-06-21 | 1977-12-21 | $7700.00 | Window Closed / Lapsed |