Patents by Inventor Matthias Kremer

Matthias Kremer 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: 5846501
    Abstract: In order to recover in an environmentally sound and economic manner used hardening shop salts which contain nitrate-nitrite, the salts, comminuted to particle sizes of from 1 to 50 mm, are dissolved in a mixture of nitric acid and hydrogen peroxide without nitrogen oxides arising, and, by evaporation and cooling, potassium nitrate, sodium chloride, and sodium nitrate are obtained sequentially by fractional crystallization.
    Type: Grant
    Filed: April 11, 1997
    Date of Patent: December 8, 1998
    Assignee: Durferrit GmbH Thermotechnik
    Inventors: Matthias Kremer, Georg Wahl, Eberhard Gock, Stefan Wigger, Jorg Kahler
  • Patent number: 5527018
    Abstract: In a filter unit (25) and apparatus for desludging salt baths (1), which is flooded at least partially by the salt bath and is in working association with the upper end of a riser tube (23), the bath fluid to be desludged being driven, by means of a compressed air stream, for example, through the riser tube (23) toward the filter unit (9, 25), the filter cloth packet is made of woven wire of a nonferrous metal, preferably an alloy based on aluminum, nickel or titanium, and is surrounded by a filter frame (14), the frame (14) being shaped into a shallow, pyramidal frustum-shaped funnel (18) pointing toward the bottom of the vat, its apical bottom end being provided with a closable opening (19).
    Type: Grant
    Filed: November 21, 1994
    Date of Patent: June 18, 1996
    Assignee: Durferrit GmbH Thermotechnik
    Inventors: George Wahl, Matthias Kremer, Tokuo Sato
  • Patent number: 5453109
    Abstract: A method for the preparation of a salt mixture useful for hardening steel parts, including of potassium cyanate, potassium carbonate and sodium carbonate, wherein 2.2 to 2.3 moles of urea is first reacted with 1 mole of potassium carbonate to form potassium cyanate. The escaping ammonia is converted with formaldehyde into hexamethylenetetramine. The reaction product, which is potassium cyanate and potassium carbonate, is ground, mixed with powdered sodium carbonate and pressed at between 80.degree. and 230.degree. C. into shaped pieces.
    Type: Grant
    Filed: July 13, 1994
    Date of Patent: September 26, 1995
    Assignee: Durferrit GmbH Thermotechnik
    Inventors: Peter Schalke, Eberhard Mueller, Matthias Kremer, Georg Wahl