Math teaching aid
USD621877S1 · kind S1 · design
3Cited by
5References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Mar 17, 2008 |
| Grant date | Aug 17, 2010 |
| Priority date | — |
| Expiry date | Aug 17, 2024 |
Classification
- Technology area (CPC —)General
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.