Patents by Inventor Alexander Lenfers

Alexander Lenfers has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Patent number: 11364429
    Abstract: The present invention relates to a tennis wall (100), comprising a frame that can be erected on the ground (101) and a cloth (102) stretched in said frame (101), wherein the cloth (102) is stretched such that a level cloth surface (104) is formed and that a tennis ball hitting the cloth surface (104) rolls or slides up the cloth surface (104) and then rolls or slides down again, characterized in that a recess (105) is provided on the upper end (103) of the cloth (102), the recess (105) being designed and positioned such that a tennis ball, once it has rolled or slid up the cloth surface (104), then enters the recess (105), subsequently rolls or slides out of the recess (105) again and only then rolls or slides down the cloth surface (104). The invention also relates to the use of this tennis wall as an aid in tennis training.
    Type: Grant
    Filed: January 11, 2019
    Date of Patent: June 21, 2022
    Inventor: Alexander Lenfers
  • Publication number: 20210113907
    Abstract: The present invention relates to a tennis wall (100), comprising a frame that can be erected on the ground (101) and a cloth (102) stretched in said frame (101), wherein the cloth (102) is stretched such that a level cloth surface (104) is formed and that a tennis ball hitting the cloth surface (104) rolls or slides up the cloth surface (104) and then rolls or slides down again, characterized in that a recess (105) is provided on the upper end (103) of the cloth (102), the recess (105) being designed and positioned such that a tennis ball, once it has rolled or slid up the cloth surface (104), then enters the recess (105), subsequently rolls or slides out of the recess (105) again and only then rolls or slides down the cloth surface (104). The invention also relates to the use of this tennis wall as an aid in tennis training.
    Type: Application
    Filed: January 11, 2019
    Publication date: April 22, 2021
    Inventor: Alexander Lenfers