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FM demodulators
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Patent number 4,746,873
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Issue date May 24, 1988
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Plessey Overseas Limited
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Nicholas P. Cowley
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H03 - BASIC ELECTRONIC CIRCUITRY
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Frequency modulation detectors
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Patent number 4,603,302
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Issue date Jul 29, 1986
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Plessey Overseas Limited
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Rodney J. Lawton
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H03 - BASIC ELECTRONIC CIRCUITRY
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3906245
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Patent number 3,906,245
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Issue date Sep 16, 1975
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G11 - INFORMATION STORAGE
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3706946
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Patent number 3,706,946
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Issue date Dec 19, 1972
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H03 - BASIC ELECTRONIC CIRCUITRY
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2309705
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Patent number 2,309,705
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Issue date Jan 26, 1943
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H03 - BASIC ELECTRONIC CIRCUITRY
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2286356
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Patent number 2,286,356
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Issue date Jun 16, 1942
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H03 - BASIC ELECTRONIC CIRCUITRY
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2212338
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Patent number 2,212,338
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Issue date Aug 20, 1940
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H04 - ELECTRIC COMMUNICATION TECHNIQUE