Learning toy
US5277587A · kind A · utility
4Cited by
12References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 15, 1992 |
| Grant date | Jan 11, 1994 |
| Priority date | — |
| Expiry date | Sep 15, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09B3/02
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A learning device including a holder having a storage area and a display area. Information cards including a problem and a coded solution are selectively introduced into the display area wherein the problem remains visible and the coded answer is viewed through one or more specifically configured openings which combine with the coded answer to provide a deciphered or readable answer.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.