Patents by Inventor Donald J. Grail

Donald J. Grail 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).

  • Roof tile and tile composition of matter
    Patent number: 4514947
    Abstract: A roof tile made of a composition of matter comprising cement, silica sand, iron oxide pigment, acrylic polymer resin, an antifoaming agent and water, and formed into a shape having a top surface, a bottom surface, a top end, a butt end, and with a longitudinal side edge having a longitudinal flange, and another longitudinal side edge having a longitudinal concavity, with a plurality of ribs formed in the bottom surface, and reinforcing wire embedded in said ribs and the bottom perimeter of the tile.
    Type: Grant
    Filed: May 18, 1983
    Date of Patent: May 7, 1985
    Assignee: Embelton-Grail, Inc.
    Inventor: Donald J. Grail