Electronic desk calculator with blackboard display
USD245024S · kind S · design
12Cited by
3References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 29, 1976 |
| Grant date | Jul 12, 1977 |
| Priority date | — |
| Expiry date | Jul 12, 1991 |
Classification
- Technology area (CPC —)General
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.