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
Programming method of non-volatile memory device
Soybean cultivar BY0811143
Method and device for accessing the documentation of an aircraft according to alarms generated therein
Process for producing dipeptides or dipeptide derivatives
Integrated circuit packaging system with laser hole and method of manufacture thereof
Digital signal processing apparatus, liquid crystal display apparatus, digital signal processing method and computer program
Method for measuring and improving organization effectiveness
  Randomly Featured Patents
Personal nanoparticle sampler
Non-aqueous liquid detergent composition comprising perborate anhydrous
Switching power supply with reduced energy transfer during a fault condition
Process for low temperature semiconductor fabrication
Linear synchronous motor railroad train driven power generating system
Ultra-low expansion ceramic articles
Varying irrigation scheduling based on height of vegetation
Adaptive beam-steering methods to maximize wireless link budget and reduce delay-spread using multiple transmit and receive antennas
Process for preparing a protein fortified natural cereal
Silane-modified oxidic or silicate-like filler, process for its preparation, and its use