Matti Virta

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Helsinki, FI

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Patents Grantslast 30 patents

Information Patent Grant
Inverter circuit with a control circuit for leading transistors mor...
- Patent number 4,603,378
- Issue date Jul 29, 1986
- Oy Helvar
- Matti Virta
- H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
Information Patent Grant
Electronic ballast for a discharge lamp
- Patent number 4,553,070
- Issue date Nov 12, 1985
- Oy Helvar
- Martti Sairanen
- H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
Information Patent Grant
Means for limiting and controlling the current of a discharge lamp
- Patent number 4,492,897
- Issue date Jan 8, 1985
- Hauenkalliontie 6 A 4
- Martti Sairanen
- H05 - ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR