Patents by Inventor Harvey D. Allen

Harvey D. Allen 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: 4320078
    Abstract: A process of making a porous, lightweight, insulative, inorganic container for plants having an ornamental marbleized appearance. A basic slurry formed of gypsum cement is poured into a rotating mold. While the basic slurry is being poured into the mold, one or more colored slurry mixtures are poured onto the stream of basic slurry such that the basic slurry and the colored slurry mixtures remain separated by an interface such that each stream of slurry maintains its integrity to form discrete markings of different colors in the wall of the cast container. The casting is allowed to cure for a period of 25-30 minutes in the mold at a temperature of about 70.degree. F. After the casting has been removed from the mold, it is held in a controlled atmosphere at 120.degree. F. and less than 40% relative humidity.
    Type: Grant
    Filed: February 13, 1978
    Date of Patent: March 16, 1982
    Inventors: Harvey D. Allen, Monte D. Allen
  • Patent number: 4020638
    Abstract: An auxiliary fluid power system for use with a prime mover such as an internal combustion engine. The auxiliary fluid power system comprises a fluid drive means to generate a fluid pressure, an auxiliary drive means operable in a first or second direction attached to the prime mover power train, fluid conduit means including a fluid supply conduit and fluid return conduit coupled between the fluid drive means and the auxiliary drive means and a control means to selectively control the operative direction of the auxiliary drive means such that the auxiliary drive means boost the power of the prime mover when operating in the first direction and retards the prime mover when operating in the second direction.
    Type: Grant
    Filed: October 28, 1975
    Date of Patent: May 3, 1977
    Inventor: Harvey D. Allen