Patents by Inventor Michael J. Heister

Michael J. Heister 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).

  • Portable battery-powered grease gun
    Patent number: 5105912
    Abstract: A hand-held grease gun that is battery-powered and fully portable. The grease gun uses a disposable cartridge filled with grease that is under pressure exerted by a spring loaded plunger. Grease from the cartridge is discharged into a chamber containing a piston to draw the grease from the cartridge into the chamber and discharge it through a nozzle whenever the trigger is actuated by the user.
    Type: Grant
    Filed: December 11, 1990
    Date of Patent: April 21, 1992
    Inventor: Michael J. Heister