PD

Per-Olav Dahlin

3M: 2 patents #5,326 of 11,543Top 50%
Overall (All Time): #1,558,584 of 4,157,543Top 40%
3
Patents All Time

Issued Patents All Time

Patent #TitleCo-InventorsDate
7884888 Automatic darkening filter with offset polarizers Kristina M. Magnusson, Kenneth Jarefors 2011-02-08
7477330 Automatic darkening filter with offset polarizers Kristina M. Magnusson, Kenneth Jarefors 2009-01-13
4637731 Device for making porous concrete 1987-01-20