Resources Contact Us Home
Browse by: INVENTOR PATENT HOLDER PATENT NUMBER DATE
 
 
System and apparatus for program controlled delivery of game balls










Image Number 7 for United States Patent #4269163.

An ejector for a sequence of game balls has variable device for setting a different trajectory for each ball and for varying the time interval between each ball delivery. A controller includes an input device used by the tennis player or instructor to enter the court and ball data for each of a sequence of balls; a converter for changing the court and ball data to corresponding trajectory data used in setting the ball ejector; and a digital memory for storing the data for each ball. The controller is switched to a programming mode for setting up the court and ball data for the sequence of balls to be delivered and to an operating mode in which the balls are delivered in accordance with the set program.








 
 
  Recently Added Patents
High brightness laser diode module
Portable electric circular saw
Fluid conduit with PTC fabric heating
Using storage cells to perform computation
Electron beam manipulation system and method in X-ray sources
Defect inspection method and device therefor
Rain barrel
  Randomly Featured Patents
Method and peptide for regulating cellular activity
Dynamic hook insert for a movable seat back
Method and apparatus for correcting code errors
Lounge-chair
Third party verification system and method
License plate holder
Vapor recovery system
Mercury-free metal-halide lamp
Electroacoustic cable for magnetic resonance applications
Process for the disposal of phthalic anhydride decomposer vapors