TOOTHBRUSH
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United States of America Patent
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Issued Date -
Dec 1, 2022
app pub date -
Dec 23, 2020
filing date -
Dec 23, 2020
priority date (Note) -
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status (Latency Note)
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Abstract
A toothbrush includes the head portion that is molded from a polyacetal resin having a weight-average molecular weight of 130000 or more. When the head portion is a thin head having a thickness of 3.0 mm or less, a base thickness that corresponds to a thickness of an implantation base is T1 (mm), a hole depth of an implantation hole is U1 (mm), a flat wire implantation depth that corresponds to a depth from an implantation face to an upper end of the flat wire implanted from the implantation face is H1 (mm), and a weight-average molecular weight of the polyacetal resin is Mw, a following equation (1) is satisfied.
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