Patents by Inventor John A. Heffner

John A. Heffner 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: 10344434
    Abstract: Methods, systems and devices for detectable warnings are disclosed.
    Type: Grant
    Filed: October 17, 2016
    Date of Patent: July 9, 2019
    Inventors: Kenneth E. Szekely, David N. Sambrook, John A. Heffner
  • Publication number: 20170096784
    Abstract: Methods, systems and devices for detectable warnings are disclosed.
    Type: Application
    Filed: October 17, 2016
    Publication date: April 6, 2017
    Inventors: Kenneth E. Szekely, David N. Sambrook, John A. Heffner
  • Publication number: 20140286702
    Abstract: A detectable warning tile which aims to solve the problem of buckling and cracking associated with different thermal expansion properties of the tile and the substrate in which it is installed. Said tile is provided with underside flanges on only some of the outermost vertical surface of the tile. The tile need not be a quadrilateral, the tile may have more or fewer than fours edges.
    Type: Application
    Filed: October 3, 2012
    Publication date: September 25, 2014
    Applicant: ENGINEERED PLASTICS INC.
    Inventors: Kenneth E. Szekely, David N. Sambrook, John A. Heffner