Patent US3299538A successfully refreshed from Google Patents.
US3299538A
Expired / Lapsed
US
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Teaching machine
Assignee: HYMAN HURVITZ
•
Filing: 1965-10-20
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Granted: 1967-01-24
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Expires: 1985-10-20
Abstract
No abstract record available.
Inventors
- 👤 James N Cooper
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:01
CPC Classifications
G; G09; G09B; G09B5/00; G09B5/04
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
145 words
IN A TEACHING MACHINE EMPLOYING A MASTER TAPE CONTAINING DUPLICATE PAIRS OF ITEMS OF PRE-RECORDED INFORMATION, EACH PAIR BEING OF RANDOM LENGTH WITH RESPECT TO OTHERS OF SAID PAIRS, A BLANK STUDENT TAPE, A FIRST READOUT HEAD FOR SAID MASTER TAPE, A RECORD HEAD AND A SECOND READOUT HEAD FOR SAID STUDENT TAPE, A THREE-POSITION SWITCH, MEANS RESPONSIVE TO SAID SWITCH IN A FIRST OF SAID POSITIONS FOR READING OUT A FIRST ITEM OF A PAIR FROM SAID MASTER TAPE, MEANS RESPONSIVE TO SAID SWITCH IN A SECOND OF SAID POSITIONS FOR RECORDING VIA SAID RECORD HEAD ON SAID STUDENT TAPE, MEANS RESPONSIVE TO SAID SWITCH IN A THIRD OF SAID POSITIONS AND INCLUDING SAID SECOND READOUT HEAD FOR READING OUT PRECISELY THE RECORDING ON SAID STUDENT TAPE REGARDLESS OF THE LENGTH THEREOF, AND MEANS FOR THEREAFTER READING OUT THE SECOND ITEM OF SAID PAIR.
Claim 2
Dependent Claim
145 words
IN A TEACHING MACHINE EMPLOYING A MASTER TAPE CONTAINING DUPLICATE PAIRS OF ITEMS OF PRE-RECORDED INFORMATION, EACH PAIR BEING OF RANDOM LENGTH WITH RESPECT TO OTHERS OF SAID PAIRS, A BLANK STUDENT TAPE, A FIRST READOUT HEAD FOR SAID MASTER TAPE, A RECORD HEAD AND A SECOND READOUT HEAD FOR SAID STUDENT TAPE, A THREE-POSITION SWITCH, MEANS RESPONSIVE TO SAID SWITCH IN A FIRST OF SAID POSITIONS FOR READING OUT A FIRST ITEM OF A PAIR FROM SAID MASTER TAPE, MEANS RESPONSIVE TO SAID SWITCH IN A SECOND OF SAID POSITIONS FOR RECORDING VIA SAID RECORD HEAD ON SAID STUDENT TAPE, MEANS RESPONSIVE TO SAID SWITCH IN A THIRD OF SAID POSITIONS AND INCLUDING SAID SECOND READOUT HEAD FOR READING OUT PRECISELY THE RECORDING ON SAID STUDENT TAPE REGARDLESS OF THE LENGTH THEREOF, AND MEANS FOR THEREAFTER READING OUT THE SECOND ITEM OF SAID PAIR.
References Cited (Backward Citations)
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Cited
US2989594A
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US3091408A
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US3057529A
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US3155778A
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US3235264A
Cited
US3234666A
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-01-23 | 1970-07-25 | 1971-01-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-01-23 | 1974-07-25 | 1975-01-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-01-23 | 1978-07-25 | 1979-01-24 | $7700.00 | Window Closed / Lapsed |