Inventor

JOHNSON NORBERT L

US2 patents

⚠️ This page may combine multiple inventors who share the name “JOHNSON NORBERT L”. Patents are grouped by organization below to help distinguish them — per-person disambiguation is on the roadmap.

3M INNOVATIVE PROPERTIES CO

1 patent

US5940212AAug 17, 1999

Cube corner article with altered inactive areas and method of making same

3M INNOVATIVE PROPERTIES CO52 citations92

ECKHARDT STEPHEN K

1 patent

US8675194B2Mar 18, 2014

Apparatus for measuring the retroreflectance of materials

ECKHARDT STEPHEN K2 citations56