Patents by Inventor Hans J. Leugering

Hans J. Leugering 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 preparing oxymethylene polymers in a granular form
    Patent number: 4151346
    Abstract: Oxymethylene polymers are obtained in a granular form by cooling a solution or dispersion of an oxymethylene polymer, the temperature of which solution or dispersion is above the sintering temperature of the oxymethylene polymer, to a temperature just below the sintering temperature of the oxymethylene polymer. As dissolving or dispersing agent as well as precipitating and cooling agent there is used a mixture of methanol and water having a methanol content of at least 75% by weight. The oxymethylene polymer obtained is suitable as engineering plastic for preparing moulded articles.
    Type: Grant
    Filed: January 26, 1978
    Date of Patent: April 24, 1979
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Gunter Sextro, Karlheinz Burg, Helmut Schlaf, Hans J. Leugering, Alwin Heller