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Ventilation fan control
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Patent number 5,364,026
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Issue date Nov 15, 1994
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Control Resources, Inc.
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Warren R. Kundert
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F24 - HEATING RANGES VENTILATING
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Speed controller
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Patent number 4,879,754
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Issue date Nov 7, 1989
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Matsushita Electric Industrial Co., Ltd.
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Kunihira Tadashi
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Pulse-width modulation drive circuit
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Patent number 4,823,056
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Issue date Apr 18, 1989
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Pioneer Electronic Corporation
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Yoshihiko Watanabe
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Motor speed control apparatus
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Patent number 4,748,389
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Issue date May 31, 1988
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Matsushita Electric Industrial Co., Ltd.
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Junichi Nakakuki
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Motor drive control device
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Patent number 4,680,517
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Issue date Jul 14, 1987
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Alps Electric Co., Ltd.
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Kazunori Fujioka
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Load drive apparatus
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Patent number 4,656,401
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Issue date Apr 7, 1987
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Hitachi, Ltd.
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Hisakazu Ninomiya
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Tachometer check apparatus
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Patent number 4,575,664
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Issue date Mar 11, 1986
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Westinghouse Electric Corp.
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Frederick O. Johnson
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G01 - MEASURING TESTING
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Servomotor drive system
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Patent number 4,525,658
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Issue date Jun 25, 1985
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Ricoh Co., Ltd.
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Shoji Yanagida
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Speed control for a rotary machine
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Patent number 4,488,096
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Issue date Dec 11, 1984
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Papast-Motoren GmbH & Co. KG
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Hinrich Cap
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
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Speed control for a rotary machine
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Patent number 4,337,424
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Issue date Jun 29, 1982
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Papst Motoren KG
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Heinrich Cap
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H02 - GENERATION CONVERSION OR DISTRIBUTION OF ELECTRIC POWER