Patents by Inventor Michael A. Dondelewski

Michael A. Dondelewski 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).

  • Process for the beneficiation of carbonous materials with the aid of ultrasound
    Patent number: 4391608
    Abstract: A process for reducing the sulfur and ash content of coal and the like by treatment in an aqueous slurry with ultrasound followed by subsequent separating steps.
    Type: Grant
    Filed: August 3, 1981
    Date of Patent: July 5, 1983
    Inventor: Michael A. Dondelewski
  • Method of recovering and using fine coal
    Patent number: 4385995
    Abstract: Method of recovering and using heretofore lost or discarded coal fines which are a product of various coal washing processes comprising coating the fine coal with a oil/water mixture, separating excess oil/water mixture, forming into particles as by rolling or tumbling and drying to recover a strong pellet suitable for shipment.
    Type: Grant
    Filed: August 15, 1980
    Date of Patent: May 31, 1983
    Inventor: Michael A. Dondelewski
  • Carbonaceous pellets and method of making
    Patent number: 4357145
    Abstract: A method of pelletizing carbonaceous materials including bonding coal fines and lignite coal with a polymeric hydrocarbon binder having reactive sites thereon, for example, with tall oil pitch and the like. In the case of coal, the binder is applied by slurrying the fine coal with the pitch. In the case of lignite, binder is directly applied to the pulverized material. By action of rolling and tumbling, for example, large agglomerates are formed. With drying and heating, strong water-resistant pellets are formed which have the extremely desirable property of being easily repulverized.
    Type: Grant
    Filed: March 27, 1981
    Date of Patent: November 2, 1982
    Inventor: Michael A. Dondelewski
  • Hydrodesulfurization of coal with hydrogen peroxide in brine solution
    Patent number: 4183730
    Abstract: A process for reducing the sulfur content of coal and the like by treatment with an aqueous solution of sodium chloride and hydrogen peroxide.
    Type: Grant
    Filed: October 25, 1978
    Date of Patent: January 15, 1980
    Assignee: Coalmet Corporation
    Inventor: Michael A. Dondelewski
  • Hydrodesulfurization of coal and the like
    Patent number: 4127390
    Abstract: A process for reducing the sulfur content of coal and the like by treatment with an aqueous sodium chloride solution at moderately elevated temperatures and pressures.
    Type: Grant
    Filed: August 25, 1977
    Date of Patent: November 28, 1978
    Assignee: Coalmet Corporation
    Inventor: Michael A. Dondelewski