Automatic eye-refraction measuring apparatus with spectacle lens measuring apparatus
USD341541S · kind S · design
17Cited by
6References
1Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 10, 1992 |
| Grant date | Nov 23, 1993 |
| Priority date | — |
| Expiry date | Nov 23, 2007 |
Classification
- Technology area (CPC —)General
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.