MS

Martti Sairanen

OH Oy Helvar: 3 patents #2 of 6Top 35%
UN Unknown: 1 patents #29,356 of 83,584Top 40%
Overall (All Time): #885,767 of 4,157,543Top 25%
6
Patents All Time

Issued Patents All Time

Showing 1–6 of 6 patents

Patent #TitleCo-InventorsDate
6160693 Short circuit protection for a semiconductor switch 2000-12-12
5034660 Method of and apparatus for supplying high frequency alternating current to a fluorescence lamp 1991-07-23
4719390 Electronic mains connection device for a gas discharge lamp 1988-01-12
4553070 Electronic ballast for a discharge lamp Matti Virta 1985-11-12
4492897 Means for limiting and controlling the current of a discharge lamp Matti Virta 1985-01-08
4456855 Intensity regulator, especially a light regulator 1984-06-26