PS

Petrus A. Swarte

U.S. Philips: 1 patents #4,133 of 8,851Top 50%
Overall (All Time): #3,986,996 of 4,157,543Top 100%
1
Patents All Time

Issued Patents All Time

Showing 1–1 of 1 patents

Patent #TitleCo-InventorsDate
4712247 Electro-acoustic system having a variable reflection/absorption characteristic — 1987-12-08