John K. O'Brien

Follow

Person

Sudbury, MA, US

People

Patents Grantslast 30 patents

Information Patent Grant
Remote color measurement device
- Patent number 4,881,811
- Issue date Nov 21, 1989
- Colorgen, Inc.
- John K. O'Brien
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE
Information Patent Grant
Methods for determining the proper coloring for a tooth replica
- Patent number 4,654,794
- Issue date Mar 31, 1987
- Colorgen, Inc.
- John K. O'Brien
- A61 - MEDICAL OR VETERINARY SCIENCE HYGIENE