Shape sorting educational toy
US5139453A · kind A · utility
40Cited by
17References
18Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Mar 15, 1991 |
| Grant date | Aug 18, 1992 |
| Priority date | — |
| Expiry date | Mar 15, 2011 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63F2009/0668
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
A sorting device including an open top container with an invertible sorting member mounted thereover. The sorting member includes multiple funnel-shaped passages therethrough each having, at one end, an enlarged opening and at the second truncated end a specifically configured opening of a size to closely receive and pass therethrough only a correspondingly configured block introduced in either direction through the configured opening.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.