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Optical fluid level sensor
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Patent number 4,878,383
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Issue date Nov 7, 1989
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United Technologies Corporation
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Walter J. Wiegand
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G01 - MEASURING TESTING
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Ionization flowmeter
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Patent number 4,393,719
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Issue date Jul 19, 1983
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United Technologies Corporation
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Walter J. Wiegand
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G01 - MEASURING TESTING
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Ion production means
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Patent number 4,049,989
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Issue date Sep 20, 1977
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United Technologies Corporation
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Robert H. Bullis
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G01 - MEASURING TESTING
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Four-collector flux sensor
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Patent number 4,019,383
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Issue date Apr 26, 1977
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United Technologies Corporation
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Walter J. Wiegand
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G01 - MEASURING TESTING
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Ion collector
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Patent number 4,003,254
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Issue date Jan 18, 1977
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United Technologies Corporation
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Robert H. Bullis
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G01 - MEASURING TESTING