Garmin Corporation

The Louis Berkman Company

Ronald Thomas Chinnery

Jay Dee Krull

Lawrence W Beason

Stephen M Davis

Lynn Edon Richardson

A system is provided for controlling the positions of a vehicle snow plow hydraulic lift control cylinder for raising the plow upon activation of a first solenoid by a first control signal, and at least one hydraulic pivot cylinder for pivoting said plow with respect to the vehicle upon activation of a second solenoid by a second control signal, where the vehicle has an electrical network. The system comprises a manual switching unit including a first switch for creating a first digital command signal, a second switch for creating a second digital command signal, a coding circuit for creating a first communication signal upon receipt of the first digital command signal and a second communication signal upon receipt of the second digital command signal, a connector adapted to be manually received in an existing receptacle chamber in the vehicle, wherein the receptacle chamber has at least one connector terminal connected to the electrical network, and the connector includes an electrical element adapted to be electrically connected to the terminal for applying said communication signals to the electrical network, and a solenoid operating unit fixed on the vehicle with an input connected to the network, outputs connected to each of the solenoids, and a receiver circuit for creating the first command signal upon receipt of the first communication signal and the second command signal upon receipt of the second communication signal and applying the command signals to the outputs.

System for controlling a snowplow and other vehicle accessories

A device and method for compensating a crystal oscillator that is not electrically compensated over its operable temperature range. A GPS receiver device stores in memory data indicative of the actual offset frequency of oscillation of the crystal over its operable temperature range. The first time the device is activated, the temperature at the crystal is sensed and data, stored in memory, indicative of the specified frequency offset of the crystal at the sensed temperature is retrieved, and used to control the receiver.backslash.decoder. When the receiver locks onto a sufficient number of satellites to calculate its two-dimensional location, the actual frequency offset of the crystal is calculated and stored in memory. Repeated use of the receiver device permits a database of actual frequency offset data of the crystal, over its operable temperature range to be stored. Subsequent uses of the device permit retrieval of this data for use in locking the receiver onto satellite signals. If such data is not available, the device uses the average offset data at the given temperature. The device further adjusts the offset data originally retrieved or computed until the receiver locks onto the desired signal.

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Independence, MO, United States of America

Ronald Thomas Chinnery