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Toothbrush

  • US 5,446,940 A
  • Filed: 06/08/1994
  • Issued: 09/05/1995
  • Est. Priority Date: 03/29/1990
  • Status: Expired due to Term
First Claim
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1. A toothbrush head having a handle attached thereto, the head having a longitudinal axis and terminating in a free end remote from said handle, the head having a flat surface from which tufts of bristles extend generally upwardly, the tufts defining (1) a bristle bar group of tufts for cleaning the broad surfaces of the teeth, said bristle bar group defined by transversely extending, longitudinally spaced rows of densely packed bristles with each row extending across a portion of the width of the head, and located widthwise substantially medially of the head, said bristle bar tufts being shorter than those of any other group, (2) an interproximal group of longitudinally spaced apart bristle tufts for cleaning crevices between teeth and defined by longitudinally spaced rows having laterally spaced tufts and located substantially medially of the head (3) a gumline bristle group of spaced apart tufts for cleaning teeth at the gumline defined by a plurality of tufts substantially around the periphery of the head sides, each said gumline tuft tilting laterally outwardly (4) a leading tip group having spaced apart tufts for cleaning the teeth at the back of the mouth, said latter group including at least two tufts each of which tilt laterally outwardly toward a respective opposite side of the head and which are located nearest the free end of the head, said interproximal tufts and said gumline tufts being in the same rows transverse to said longitudinal axis, most of said bristle bar tufts and said interproximal tufts alternating in transverse rows along the longitudinal axis of the head, two rows of said interproximal tufts being next adjacent and located nearest said free end of the head between one of said bristle bar tufts and said leading tip group.

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