Patents by Inventor Martin H. Wahl

Martin H. Wahl 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: 4056155
    Abstract: A portable scale is provided, to be used in conjunction with the jack tube on a trailer hitch, to provide trailer tongue weight. The tongue weight scale is constructed to accept the trailer tongue support and guide it directly onto a weighing device. The scale is formed with an elongated housing surrounding the jack tube guide and a weighing device. The jack tube guide receives the trailer jack tube and guides it onto the weighing device. The jack tube guide is formed to have an inner dimension just slightly larger than the outer dimension of the jack tube so that during a weighing operation when a load is applied from the jack tube to the weighing device, the jack tube guide sleeve functions to maintain alignment and keep the scale and jack tube together. A scale, disposed on the outside of the elongated housing, operates in conjunction with an indicator connected to the weighing device, to provide a visual indication of the trailer tongue weight.
    Type: Grant
    Filed: March 1, 1976
    Date of Patent: November 1, 1977
    Inventor: Martin H. Wahl
  • Patent number: 4007636
    Abstract: A liquid metal level indicator is provided comprising a number of separate, substantially identical coils supported in a vertical array and adapted to be extended into a liquid metal bath. Means are provided for comparing the impedance of each coil to that of the next adjacent coil successively from one end of the array to the other to indicate the liquid level by the change in impedance of the coils due to the presence of liquid metal surrounding them.
    Type: Grant
    Filed: March 4, 1975
    Date of Patent: February 15, 1977
    Assignee: Mine Safety Appliances Company
    Inventor: Martin H. Wahl
  • Patent number: D255664
    Type: Grant
    Filed: January 25, 1978
    Date of Patent: July 1, 1980
    Inventor: Martin H. Wahl