Patents by Inventor Andrew M. Burkhart

Andrew M. Burkhart 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).

  • Stable, cement-bonded, overhead sprayed insulating mixes and resultant linings
    Patent number: 5603759
    Abstract: A pulverulent mix, sprayable when mixed with a liquid for forming a stable, cement-bonded insulating refractory which can be sprayed onto vertical and overhead surfaces without deformation, comprising a lightweight and/or dense refractory aggregate, a calcium aluminate cement, a microsilica, a ball clay, and a superfine refractory. The superfine refractory comprises 2 to 15 wt. % of the mix and the -325 mesh portion of the mix being from about 40 to 60 wt. %.
    Type: Grant
    Filed: May 30, 1995
    Date of Patent: February 18, 1997
    Assignee: Indresco Inc.
    Inventor: Andrew M. Burkhart
  • Molybdenum trioxide bonded basic monolith and method
    Patent number: 5296422
    Abstract: The problems associated with the use of chromic acid (CrO.sub.3) binders are substantially overcome by a basic refractory monolith incorporating molybdenum trioxide (molybdic oxide, moO.sub.3) as the binding agent. In accordance with a preferred embodiment, the basic monolith contains about 0.5 wt. % pH modifier, such as sodium carbonate; about 2 wt. % molybdic oxide (MoO.sub.3); about 3 wt. % crude clay; and 75 to 99 wt. % basic refractory aggregate.
    Type: Grant
    Filed: April 26, 1993
    Date of Patent: March 22, 1994
    Assignee: Dresser Industries, Inc.
    Inventor: Andrew M. Burkhart