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
Method of manufacturing a plurality of electronic assemblies
Compact ion accelerator source
Lateral flow test kit and method for detecting an analyte
Process for preparing synthetic intermediates of peripherally-selective inhibitors of dopamine-.beta.-hydroxylase involving catalytic asymmetric hydrogenation
Quinoid thiophene organic photoelectric material, preparation method thereof and application thereof
Memory component and memory device
Method and apparatus for managing backup channel in multi-channel environment
  Randomly Featured Patents
Invoiceless trading and settlement method and system
Limited slip differential using a continuous worm gear
Multiply fabric having center portion with delicate warp threads and lateral portions with robust threads
5,11-dihydrodibenzo[b,e][1,4]-thiazepines useful as gastro intestinal selective calcium antagonists
Thrust nozzle for a gas turbine engine
Aluminum composite composition and method
Method and apparatus for controlling transistors as rectifiers
Substituted triazolinones as crop protection agents
Portable storm drain cover
Systems and methods for health based spillover