Patents Represented by Attorney Kenneth Pritchard

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  • Ducted rockets
    Patent number: 4133173
    Abstract: The overall efficiency of a reaction engine having primary and secondary combustion chambers is greatly improved by reducing the primary exhaust velocity to subsonic speed. This is accomplished in a preferred embodiment by using an exhaust tube downstream of the primary nozzle. A tube diameter of about six times that of the primary throat diameter and a tube length of about five to ten times that of the tube diameter is considered optimum.
    Type: Grant
    Filed: June 13, 1977
    Date of Patent: January 9, 1979
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Klaus C. Schadow
  • Inductive communication system
    Patent number: 4117271
    Abstract: An apparatus providing multiple conversations over limited range. Pseudo-se modulations and specific address coding permit multiple conversations between a base station and several vehicles or between the vehicles. A variable power source gives even greater range control for private communication. By utilizing portable communicators, vehicles can be guided by individuals around the base station.
    Type: Grant
    Filed: January 10, 1977
    Date of Patent: September 26, 1978
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Wallis L. Teeter, David J. Richter
  • Servo type switching for remote automatic braking system
    Patent number: 4105258
    Abstract: A remote autobrake system. A linear accelerometer measures the acceleration f a vehicle to determine if it is having thrust applied to it. If the engine of the vehicle is applying thrust, a servo switch is used to prevent engagement of the brakes. This systems acts as a constant deceleration system if the thrust is below a predetermined level. This system can be used with an antiskid brake system.
    Type: Grant
    Filed: May 19, 1977
    Date of Patent: August 8, 1978
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventor: Jay W. Bornfleth
  • Electronic ignition system for liquid explosive
    Patent number: 4104970
    Abstract: An electronic ignition system for liquid explosive such as liquid propell ammunition. An SCR is used to provide a long life trigger with high reliability. An inductor is used to limit peak current and lengthen the spark.
    Type: Grant
    Filed: February 10, 1977
    Date of Patent: August 8, 1978
    Assignee: The United States of America as represented by the Secretary of the Navy
    Inventors: Gary L. Petersen, Larry L. Liedtke