SIGNATURE JOINDER AGREEMENT
EXHIBIT 3
Pursuant to the Securities Exchange Act of 1934, the undersigned hereby agree that only one statement containing the information required on Amendment No. 1 to Schedule 13D need be filed with respect to ownership by each of the undersigned of shares of common stock of Optical Sensors Incorporated.
This Agreement may be executed in any number of counterparts, each of which shall be deemed an original.
| Dated: July 1, 2005 |
| /s/ Xxxxx Xxxxx |
| Xxxxx Xxxxx |
| XXXXX INVESTMENT COMPANY II, LP | ||
| By: |
/s/ Xxxxx Xxxxx | |
| Xxxxx Xxxxx | ||
| Its: |
General Partner | |
