Patent US2431897A successfully refreshed from Google Patents.
US3100352A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Educational device
Assignee: Astra Corp
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Filing: 1960-09-27
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Granted: 1963-08-13
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Expires: 1980-09-27
Abstract
No abstract record available.
Inventors
- 👤 Matthijs G J Boissevain
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:32
CPC Classifications
G; G09; G09B; G09B7/00; G09B7/06; G09B7/063
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
202 words
AN EDUCATIONAL DEVICE COMPRISING A PLURALITY OF GROUPS OF ELECTRIC CIRCUIT TERMINALS IN A HOUSING, A MOVABLE PROBE ADAPTED TO BE CONDUCTIVELY CONNECTED TO SELECTED ONES OF SAID TERMINALS TO COMPLETE ELECTRICAL CIRCUITS THERETHROUGH, A TEACHING CARD FORMED WITH SWITCH OPERATING PORTIONS, THE CARD BEING REMOVABLY POSITIONED IN THE HOUSING WITH ONE SIDE SUBSTANTIALLY EXPOSED TO VIEW AND DISPLAYING A PLURALITY OF DISCRETE PROBLEMS EACH OF WHICH IS ASSOCIATED WITH ONE OF THE GROUPS OF TERMINALS, CORRECT ANSWER CIRCUITS INCLUDING OPERATING MEANS AND CORRECT SEQUENTIAL SWITCH MEANS TO CONNECT THE GROUPS OF TERMINALS SUCCESSIVELY TO THE OPERATING MEANS, INCORRECT ANSWER CIRCUITS INCLUDING A WRONG ANSWER INDICATOR AND INCORRECT SEQUENTIAL SWITCH MEANS TO CONNECT THE GROUPS OF TERMINALS SUCCESSIVELY TO THE WRONG ANSWER INDICATOR, CARD OPERATED SWITCH MEANS IN THE HOUSING ASSOCIATED WITH EACH GROUP OF TERMINALS, THE SWITCH OPERATING PORTIONS OF THE TEACHING CARD BEING CORRELATED WITH THE PROBLEMS ON THE CARD TO OPERATE SELECTIVELY THE SWITCH MEANS TO CONNECT EACH OF THE TERMINALS ASSOCIATED WITH THE DISPLAYED PROBLEMS TO A PRESELECTED ONE OF THE CORRECT AND INCORRECT SEQUENTIAL SWITCH MEANS, MEANS TO APPLY A POTENTIAL BETWEEN THE PROBE AND THE CORRECT AND INCORRECT ANSWER CIRCUITS, MEANS TO CONNECT THE PROBE CONDUCTIVELY
Claim 2
Dependent Claim
202 words
AN EDUCATIONAL DEVICE COMPRISING A PLURALITY OF GROUPS OF ELECTRIC CIRCUIT TERMINALS IN A HOUSING, A MOVABLE PROBE ADAPTED TO BE CONDUCTIVELY CONNECTED TO SELECTED ONES OF SAID TERMINALS TO COMPLETE ELECTRICAL CIRCUITS THERETHROUGH, A TEACHING CARD FORMED WITH SWITCH OPERATING PORTIONS, THE CARD BEING REMOVABLY POSITIONED IN THE HOUSING WITH ONE SIDE SUBSTANTIALLY EXPOSED TO VIEW AND DISPLAYING A PLURALITY OF DISCRETE PROBLEMS EACH OF WHICH IS ASSOCIATED WITH ONE OF THE GROUPS OF TERMINALS, CORRECT ANSWER CIRCUITS INCLUDING OPERATING MEANS AND CORRECT SEQUENTIAL SWITCH MEANS TO CONNECT THE GROUPS OF TERMINALS SUCCESSIVELY TO THE OPERATING MEANS, INCORRECT ANSWER CIRCUITS INCLUDING A WRONG ANSWER INDICATOR AND INCORRECT SEQUENTIAL SWITCH MEANS TO CONNECT THE GROUPS OF TERMINALS SUCCESSIVELY TO THE WRONG ANSWER INDICATOR, CARD OPERATED SWITCH MEANS IN THE HOUSING ASSOCIATED WITH EACH GROUP OF TERMINALS, THE SWITCH OPERATING PORTIONS OF THE TEACHING CARD BEING CORRELATED WITH THE PROBLEMS ON THE CARD TO OPERATE SELECTIVELY THE SWITCH MEANS TO CONNECT EACH OF THE TERMINALS ASSOCIATED WITH THE DISPLAYED PROBLEMS TO A PRESELECTED ONE OF THE CORRECT AND INCORRECT SEQUENTIAL SWITCH MEANS, MEANS TO APPLY A POTENTIAL BETWEEN THE PROBE AND THE CORRECT AND INCORRECT ANSWER CIRCUITS, MEANS TO CONNECT THE PROBE CONDUCTIVELY
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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) | 1966-08-12 | 1967-02-11 | 1967-08-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-08-12 | 1971-02-11 | 1971-08-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-08-12 | 1975-02-11 | 1975-08-13 | $7700.00 | Window Closed / Lapsed |