Patents by Inventor Norval D. Stapelfeld

Norval D. Stapelfeld 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: 6079367
    Abstract: An apparatus and method for training an animal and confining the animal to a defined area includes a magnetically actuated switch. The apparatus further includes a housing removably attached to the animal and a transducer mounted to the housing for delivering a stimulus to the animal. The magnetically actuated switch is disposed within the housing and is coupled to the transducer. The magnetically actuated switch is used for controlling at least one of a type of stimulus delivered by the transducer to the animal, a rate of stimulus delivered by the transducer to the animal, and an intensity of stimulus delivered by the transducer to the animal.
    Type: Grant
    Filed: October 10, 1997
    Date of Patent: June 27, 2000
    Assignee: DogWatch, Inc.
    Inventors: Norval D. Stapelfeld, Cortland G. Sandberg
  • Patent number: 5543776
    Abstract: A vehicle security system including a remote control communicating with the system via an RF link for remotely arming and/or disarming the system. Modes of system operation include an armed mode in which sensor outputs are monitored for intrusion indicating conditions and an RF receiver is monitored for remote commands, an alarm mode in which a siren is sounded in response to a detection of an intrusion indicating condition during the armed mode, a disarmed mode in which sensor monitoring for intrusion conditions is disabled, a programming mode in which features of the system are programmable, a valet mode in which only selected sensor outputs are monitored, and a pre-arming mode following system disarming and prior to passive arming, in which the door switch is monitored. A display facilitates programming by providing an indication of the present position within the programming sequence.
    Type: Grant
    Filed: October 19, 1993
    Date of Patent: August 6, 1996
    Assignee: Whistler Corporation
    Inventors: Lauren L. L'Esperance, Craig R. Autio, E. Thomas Mariner, Norval D. Stapelfeld
  • Patent number: 4908629
    Abstract: An improved vehicle or other object-tracking and location system, preferably, though not essentially, of national scope, wherein transponder or transceiver-equipped stolen or missing vehicles or other objects may be located and/or tracked, as by appropriately-equipped police direction-finding tracking vehicles, through homing-in on periodic transponder reply radio transmissions automatically activated by command activation signals broadcast on the same carrier frequency as the transponder reply signals and with encoded vehicle identification information that causes the intended vehicle transponder so to reply, and with provision for modifying the command signals to require an increased rate of periodic transponder reply signal transmission to assist homing-in on the selected vehicle.
    Type: Grant
    Filed: December 5, 1988
    Date of Patent: March 13, 1990
    Assignee: Lo-Jack Corporation
    Inventors: Sheldon P. Apsell, Norval D. Stapelfeld
  • Patent number: 4818998
    Abstract: An improved vehicle or other object-tracking and location system, preferably, though not essentially, of national scope, wherein transponder or transceiver-equipped stolen or missing vehicles or other objects may be located and/or tracked, as by appropriately-equipped police direction/finding tracking vehicles, through homing-in on periodic transponder reply radio transmissions automatically activated by command activation signals broadcast on the same carrier frequency as the transponder reply signals and with encoded vehicle identification information that causes the intended vehicle transponder so to reply, and with provision for modifying the command signals to require an increased rate of periodic transponder reply signal transmission to assist homing-in on the selected vehicle.
    Type: Grant
    Filed: March 31, 1986
    Date of Patent: April 4, 1989
    Assignee: Lo-Jack Corporation
    Inventors: Sheldon P. Apsell, Norval D. Stapelfeld