GD

Guybert M. C. Derks

U.S. Philips: 1 patents #4,133 of 8,851Top 50%
Overall (All Time): #3,663,320 of 4,157,543Top 90%
1
Patents All Time

Issued Patents All Time

Patent #TitleCo-InventorsDate
5965983 Electric lamp with a coating containing a metal oxide pigment for displaying formation Anna Louise Bouwkamp-Wijnoltz, Petrus E. J. Legierse 1999-10-12