US3650044A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Teaching device
Assignee: Individual
•
Filing: 1970-09-22
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Granted: 1972-03-21
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Expires: 1990-09-22
Abstract
Abstract A teaching device which is powered by an exposed light sensitive cell. A galvanometer, a question and answer display, and pupil operated means for indicating a selected answer in the display are connected to the cell, and when a predetermined answer is selected by the pupil and light is being received by the cell, the galvanometer is energized.
Inventors
- 👤 Donald R Burdick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:12
CPC Classifications
G; G09; G09B; G09B7/00; G09B7/06; G09B7/063
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
63 words
A teaching device which comprises an exposed light sensitive cell, a galvanometer, a question and anSwer display, pupil operated means for indicating a selected answer in the display, and electric circuitry connecting the cell, the galvanometer, the display, and the pupil operated means so that when a predetermined answer is selected and light is being received by the cell, the galvanometer is energized.
Claim 2
Dependent Claim
63 words
A teaching device which comprises an exposed light sensitive cell, a galvanometer, a question and anSwer display, pupil operated means for indicating a selected answer in the display, and electric circuitry connecting the cell, the galvanometer, the display, and the pupil operated means so that when a predetermined answer is selected and light is being received by the cell, the galvanometer is energized.
Claim 3
Dependent Claim
75 words
A teaching device as in claim 1 wherein the display includes a card provided with a plurality of contacts representing selected answers to questions, the circuitry includes means connected to selected contacts representing selected answers to questions, and the pupil operated means includes a probe connected to the circuitry and engageable with the selected contacts to complete a circuit to energize the galvanometer when the probe is in engagement with one of the selected contacts.
Claim 4
Dependent Claim
32 words
A teaching device as in claim 1 which includes a case and in which the cell is mounted on an upper face of the case in position to receive light from above.
Claim 5
Dependent Claim
21 words
A teaching device as in claim 3 wherein means is provided on the case for supporting the question and answer display.
Claim 6
Dependent Claim
60 words
A teaching device as in claim 4 wherein the display is a rigid card and the means for supporting the display includes a rest on the upper face of the case for engaging a lower edge of the display card and an upright member above and behind the rest and engageable by the display card when supported on the rest.
Claim 7
Dependent Claim
34 words
A teaching device as in claim 5 wherein magnetically cooperating elements are mounted on the display card and on the upright member, the elements cooperating to hold the card in position on the case.
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) | 1975-03-21 | 1975-09-20 | 1976-03-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-03-21 | 1979-09-20 | 1980-03-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-03-21 | 1983-09-20 | 1984-03-21 | $7700.00 | Window Closed / Lapsed |