Educational toy
US4118877A · kind A · utility
0Cited by
8References
9Claims
0Family size
Inventors
Key dates
| Filing date | Jun 2, 1977 |
| Grant date | Oct 10, 1978 |
| Priority date | — |
| Expiry date | Jun 2, 1997 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09B3/06
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An educational toy comprises in combination a base, a pair of boards and a series of replaceable quiz-and-answer plates. The base has a central spindle. The boards and one of said plates are superimposed over said base. Each board is provided with one groove which is curved in opposite directions between the two boards in such a way that a crossover is formed. A magnet is buried in said crossover. There are various well-designed representations on each plate. An indicator is displaceable over said plate to indicate whether the selected answer is correct or wrong.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.