Patents by Inventor Peter Schalke

Peter Schalke 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 PRODUCING POLYOXYMETHYLENE POLYMERS HAVING INTERMEDIATE CHAIN LENGTH
    Publication number: 20220002467
    Abstract: A process for producing polyoxymethylene polymers comprises the reaction of aqueous formaldehyde solution with an aqueous solution of a base, wherein A) a starter solution comprising formaldehyde is initially charged and B) an aqueous formaldehyde solution and a base are added to the starter solution to obtain a reaction mixture. The starter solution in step A) has a temperature of ?40° C. to ?46° C. and the additions of the solutions in step B) are performed at a temperature of the reaction mixture of ?40° C. to ?46° C. The base is an alkali metal hydroxide and/or an alkaline earth metal hydroxide and the molar ratio of formaldehyde to base is ?55:1 to ?90:1 based on the total amounts of formaldehyde and base employed in the process. The base in step B) is added in aqueous solution.
    Type: Application
    Filed: November 20, 2019
    Publication date: January 6, 2022
    Inventors: Markus MEURESCH, Aurel WOLF, Christoph GÜRTLER, Annika HILL, Peter SCHALKE, Maik HELLER, Torsten DITTMER
  • Method for the preparation of a hardening salt in piece form and product
    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
  • Process for the production of guanidine hydrochloride
    Patent number: 4542240
    Abstract: Guanidine hydrochloride is produced from cyanogen chloride in a new manner. The cyanogen chloride is reacted with ammonia in the absence of a solvent at a temperature of about 140.degree. to 220.degree. C. It is advantageous to add an ammonium salt at the beginning of the reaction and to use ammonia in at least stoichiometrical amounts.
    Type: Grant
    Filed: February 24, 1981
    Date of Patent: September 17, 1985
    Assignee: Degussa Aktiengesellschaft
    Inventors: Peter Schalke, Langer Manfred, Klaus Huthmacher
  • Process for the production of substituted acetonitriles
    Patent number: 4369322
    Abstract: The known synthesis for the production of aromatic substituted acetonitriles by reaction of aromatic substances with cyanogen chloride in the gas phase is improved by feeding the starting materials in gaseous form and separated from each other into the reactor. The process can be used to synthesize in general aromatic and especially hetero-aromatic substituted acetonitrile.
    Type: Grant
    Filed: March 9, 1981
    Date of Patent: January 18, 1983
    Assignee: Degussa AG
    Inventors: Peter Schalke, Axel Kleemann
  • Process for the production of cyanocarboxylic acids
    Patent number: 4222956
    Abstract: Cyanocarboxylic acids are prepared by reacting halocarboxylic acids with cyanohydrins, preferably at a pH of 9 to 11.
    Type: Grant
    Filed: February 14, 1979
    Date of Patent: September 16, 1980
    Assignee: Deutsche Gold- und Silber-Scheideanstalt vormals Roessler
    Inventors: Axel Kleemann, Peter Schalke, Detlef Arnoldi