Patents by Inventor Yeh Mu-Shan

Yeh Mu-Shan has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 4602889
    Abstract: An adjustable knuckle joint device for folding ladders includes in combination: a first coupling member having a first circular junction portion provided with an annular flange and a plurality of openings and bulges therein and a first elongate joint portion extending at an angle from the circular junction portion; a second coupling member having a second circular portion with a flat top surface being movably connected to and in bearing contact with the first coupling member, and a second elongate joint portion extending at an angle from the second circular junction portion; a straight axle fitting pivotally connecting the first and the second circular portions together; and a snap catch positioning assembly operatably fixed on the second elongate joint portion of the second coupling member in conjunction with the first circular junction portion. By manually operating the snap catch positioning assembly, a simple, secure and safe adjustment of both coupling members relative to one another results.
    Type: Grant
    Filed: August 31, 1984
    Date of Patent: July 29, 1986
    Inventor: Yeh Mu-Shan