NORTH AMERICAN POWER SUPPLIES, INC., A CORP. OF IN

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Expired/Abandoned/Withdrawn Patents

Patent # Title Status Filing Date Issue/Pub Date Intl Class
5062197 Dual-permeability core structure for use in high-frequency magnetic componentsExpiredMay 07, 90Nov 05, 91[H01F]
5010261 Lossless gate driver circuit for a high frequency converterExpiredDec 08, 89Apr 23, 91[H03K]
4967332 HVIC primary side power supply controller including full-bridge/half-bridge driverExpiredFeb 26, 90Oct 30, 90[H02M]
4967109 High efficiency gate driver circuit for a high frequency converterExpiredDec 08, 89Oct 30, 90[H03K]
4943793 Dual-permeability core structure for use in high-frequency magnetic componentsExpiredDec 27, 88Jul 24, 90[H01F]
4825348 Resonant power converter with current sharing among multiple transformersExpiredJan 04, 88Apr 25, 89[H02M]
4796173 Low input voltage resonant power converter with high-voltage A.C. linkExpiredFeb 01, 88Jan 03, 89[H02M]
4695934 Multiple output resonant power supplyExpiredMay 13, 85Sep 22, 87[H02M]
4672528 Resonant inverter with improved controlExpiredMay 27, 86Jun 09, 87[H02P]
4670832 Resonant inverter having improved control at enablementExpiredJun 12, 86Jun 02, 87[H02M]
4346431 Field controlled thyristor switching power supplyExpiredJan 12, 81Aug 24, 82[H02M]
4342956 Proportional base drive circuitExpiredDec 23, 80Aug 03, 82[H03K]
4327309 Fluorescent lamp power supply with low voltage lamp polarity reversalExpiredJun 23, 80Apr 27, 82[H05B]
4325008 Clamp assisted cycle control regulating systemExpiredJun 09, 80Apr 13, 82[H05B]
4323962 High efficiency rectifier with multiple outputsExpiredFeb 02, 81Apr 06, 82[H02M]

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