Patents by Inventor Edward L. Friedl

Edward L. Friedl 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).

  • Ground surface drainage apparatus
    Patent number: 4419231
    Abstract: In the ground surface drainage apparatus, a monolithic catch basin has a side outlet sleeve for the positioning therein of a subterranean drainage tube. An adaptor bushing engages against a stop in the sleeve and has its own stop lip for use with a smaller sized drainage tube.
    Type: Grant
    Filed: July 23, 1981
    Date of Patent: December 6, 1983
    Inventor: Edward L. Friedl