Electronic learning aid
USD317176S · kind S · design
4Cited by
9References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 15, 1988 |
| Grant date | May 28, 1991 |
| Priority date | — |
| Expiry date | May 28, 2005 |
Classification
- Technology area (CPC —)General
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.