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DAC and oscillation circuit
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Patent number 11,025,267
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Issue date Jun 1, 2021
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SONY SEMICONDUCTOR SOLUTIONS CORPORATION
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Yoshinobu Kawasaki
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H03 - BASIC ELECTRONIC CIRCUITRY
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Tone generator
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Patent number 4,000,379
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Issue date Dec 28, 1976
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Mitel Canada Limited
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Michael C. J. Cowpland
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3909748
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Patent number 3,909,748
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Issue date Sep 30, 1975
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H03 - BASIC ELECTRONIC CIRCUITRY
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3902140
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Patent number 3,902,140
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Issue date Aug 26, 1975
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3612773
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Patent number 3,612,773
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Issue date Oct 12, 1971
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3518572
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Patent number 3,518,572
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Issue date Jun 30, 1970
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3518571
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Patent number 3,518,571
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Issue date Jun 30, 1970
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H04 - ELECTRIC COMMUNICATION TECHNIQUE
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3495187
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Patent number 3,495,187
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Issue date Feb 10, 1970
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H03 - BASIC ELECTRONIC CIRCUITRY