Patents by Inventor John Alfred Herwynen

John Alfred Herwynen 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: 4119175
    Abstract: A folding step ladder has a pair of front legs with a pair of back legs pivoted thereon, below which are upper and lower steps pivotably secured to the front pair of legs. A pair of spaced apart links are pivotably secured to the upper step at points rearwardly of its pivotal connections to the front legs and the other end of each link is pivotably connected to the rear legs at points below the upper step. The link members each have an abutment at this point which forms a stop for the ladder on unfolding. This is arranged through the action of a pair of arms, the upper ends of which are pivotably connected to the upper step rearwardly of the pivotal link connection thereto; the lower ends of the arms are pivotably secured to the rearward portion of the lower step. Each arm extends downwardly between an individual link and its adjacent rear leg but forwardly of the abutment to engage thereon when the ladder is unfolded.
    Type: Grant
    Filed: January 17, 1975
    Date of Patent: October 10, 1978
    Inventor: John Alfred Herwynen
  • Patent number: 4000596
    Abstract: A clip for securing wall panels and the like to frame members is provided which has a substantially flat T-shaped portion. The vertical leg of the T has a pointed tang extending toward the crosspiece and a pair of locating arms extending laterally in parallel substantially normal of the main plane of the vertical leg to bear upon the rear surface of the wall panel. The crosspiece is bent and provided with a plurality of points extending in parallel to the locating arms.
    Type: Grant
    Filed: August 7, 1975
    Date of Patent: January 4, 1977
    Inventors: Hugh Magill, John Alfred Herwynen