Electronic educational game for introducing children to basic math functions
USD318069S · kind S · design
15Cited by
4References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | May 3, 1989 |
| Grant date | Jul 9, 1991 |
| Priority date | — |
| Expiry date | Jul 9, 2005 |
Classification
- Technology area (CPC —)General
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.