Patents by Inventor Walter V. Hafner

Walter V. Hafner 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: 4480163
    Abstract: A vandal-resistant push button switch assembly. The switch assembly has a switch actuating device with no exposed fasteners which switch may be used in a prison cell or other area requiring a high degree of vandal resistance. Although the switch may be readily operated from within the cell, it cannot be removed from the cell or destroyed under anything but the most extreme conditions. The switch has a push button actuating shaft which is depressed by the user and this shaft in turn activates a push button electrical switch mounted on the back side of the mounting surface.
    Type: Grant
    Filed: January 5, 1983
    Date of Patent: October 30, 1984
    Assignee: Acorn Engineering Company
    Inventors: Earl L. Morris, Walter V. Hafner, Ron T. Hahn
  • Patent number: 4203173
    Abstract: A plumbing fixture in combination with means for preventing overflow from a toilet bowl having a P-trap when an obstruction is created in the waste outlet thereof, such plumbing fixture including a blow-out jet pipe, the entrance of the pipe being coupled in fluid communication with the water supply pipe connected to the toilet bowl at the upper portion thereof and the outlet of the pipe coupled in fluid communication with the P-trap of the toilet bowl of the plumbing fixture, comprising: a toilet bowl having a water supply pipe operably coupled therewith; an electrically-controlled flushing valve operably associated with the supply pipe for controlling the flow of water to the toilet bowl; a source of electricity for operating the valve; electrical switch means operably associated with the source of electricity for controlling the delivery of electricity for controlling the delivery of electricity to the valve for actuation thereof; an insulated electrical probe mounted in the water supply pipe; said electri
    Type: Grant
    Filed: May 14, 1979
    Date of Patent: May 20, 1980
    Assignee: Acorn Engineering Co.
    Inventors: Earl L. Morris, Walter V. Hafner, Theodore J. Sally
  • Patent number: 4195374
    Abstract: A plumbing fixture with a toilet bowl having a P-trap with means for inhibiting overflow from the toilet bowl when an obstruction exists in the waste outlet thereof, comprising: a tolet bowl having a flushing rim thereabout adapted to be coupled to a water supply pipe; an electrically controlled flushing valve for controlling the flow of water in the water supply pipe; a source of electricity for operating the flushing valve; a switch for controlling the flow of electricity to the flushing valve; a blow-out jet pipe coupled to the P-trap and adapted to be coupled to the water supply pipe; a hollow adapter having at least four openings thereinto wherein one opening is coupled to a water supply pipe, one opening is coupled to the blow-out jet pipe, and one opening is coupled to the flushing rim so that when water resides therein water also resides in the adapter via the opening coupled to the flushing rim, said adapter having a weir therein dividing the openings coupled to the water supply pipe and the blow-out
    Type: Grant
    Filed: May 14, 1979
    Date of Patent: April 1, 1980
    Assignee: Acorn Engineering Co.
    Inventors: Earl L. Morris, Walter V. Hafner, Theodore J. Sally