Patent US3073041A successfully refreshed from Google Patents.
US3073041A
Expired / Lapsed
US
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Means for reducing cross talk noise
Assignee: Hamilton Manufacturing Co
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Filing: 1961-08-01
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Granted: 1963-01-15
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Expires: 1981-08-01
Abstract
No abstract record available.
Inventors
- 👤 Haban Frank
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:55
CPC Classifications
H; H03; H03G; H03G3/00; H03G3/02; H03G3/04; G; G09; G09B; G09B5/00; G09B5/08; G09B5/12; G11; G11B; G11B5/00; Y; Y10; Y10S; Y10S84/00; Y10S84/04
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
130 words
A LANGUAGE TEACHING SYSTEM, COMPRISING A MASTER INSTRUCTIONAL SIGNAL SOURCE, A PLURALITY OF STUDENT BOOTH UNITS, EACH COMPRISING A STUDENT CONTROLLED SIGNAL DEVICE, A STUDENT OUTPUT LISTENING DEVICE, AND CONNECTING MEANS, INCLUDING AN AMPLIFIER DEVICE CONNECTED BETWEEN SAID STUDENT CONTROLLED SIGNAL DEVICE AND SAID LISTENING DEVICE, CONDUCTOR MEANS CONNECTING SAID INSTRUCTIONAL SIGNAL SOURCE TO EACH OF SAID BOOTH UNITS, AND ATTENUATING MEANS INTERPOSED BETWEEN SAID CONDUCTOR MEANS AND SAID BOOTH UNITS FOR REDUCING BY A PREDETERMINED AMOUNT OF STRENGTH OF ALL SIGNALS PASSING IN EITHER DIRECTION THEREBETWEEN, SAID MASTER INSTRUCTIONAL SIGNAL SOURCE PROVIDING A SIGNAL THAT IS SUBSTANTIALLY STRONGER THAN THE SIGNALS PROVIDED BY THE STUDENT CONTROLLED SIGNAL DEVICES, WHEREBY EACH STUDENT CAN LISTEN TO MATERIAL PROVIDED BY AN INSTRUCTOR AND BY HIMSELF WITHOUT CROSS TALK NOISE FROM OTHER BOOTHS.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-01-14 | 1966-07-16 | 1967-01-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-01-14 | 1970-07-16 | 1971-01-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-01-14 | 1974-07-16 | 1975-01-15 | $7700.00 | Window Closed / Lapsed |