Patents by Inventor Eric V. Wallberg

Eric V. Wallberg 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).

  • Air rifle
    Patent number: 3958550
    Abstract: An air rifle having a casing with a compression cylinder displaceably housed therein, and including a spring actuated piston, the cylinder having a front end wall with a transverse bore, tensioning structure for compressing the spring pivotally connected to the underside of the rifle, comprising a tension lever and a tension draw bar, the tension draw bar having a head portion projecting into the bore to enable the tension draw bar to be pivoted with respect to the axis of the bore, and plug elements supporting the head portion disposed on each side of the head portion so that the plug elements bear against the head portion and against the casing.
    Type: Grant
    Filed: April 30, 1974
    Date of Patent: May 25, 1976
    Assignee: Forenade Fabriksverken
    Inventors: Lennart J. I. Johansson, Bjorn W. Lindqvist, Eric V. Wallberg