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Adjective: unpatented  `ún'pa-tun-tid [N. Amer], ún'pey-tun-tid or ún'pa-tun-tid [Brit]
  1. (of devices and processes) not protected by patent
    "unpatented inventions"

See also: nonproprietary

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unparallel
unparalleled
unpardonable
unpardonably
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unparliamentary
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unpasteurised
unpasteurized
unpatented
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unpatriotically
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unpatronized
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unpeaceable
unpeaceful
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unpeg