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
Web development environment that enables a developer to interact with run-time output presentation of a page
Creating and manufacturing documents that initially exceed equipment finishing capacity
Hedge shear
Specimen preparation device, and control method in specimen preparation device
Hard disk drives having different rotational speeds
Modular storage system
Apparatus and method for manufacturing microneedles
  Randomly Featured Patents
Combined receptacle cap and capsule piercing device therefor
Method of drawing a shadow mask
Method and system for galvanically isolated transmission of gigabit/sec data via a slip ring arrangement
Gas separating membranes from polyimide polymers and a process for using the same
Scan distributor loading scan paths simultaneous with loading test data
Dithered printing of clear ink to reduce rub and offset
Hot-carrier shield formation for bipolar transistor
Direct mount for basketball backboard and rim
Apparatus and method for interfacing integrated circuits having incompatible I/O signal levels
Scanning receiver allocation method and apparatus for cellular radiotelephone systems