Patents by Inventor Hartmut Gihr

Hartmut Gihr 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 filaments from melamine/formaldehyde condensation products
    Patent number: 5916999
    Abstract: A process for producing continuous filament fibers from a hydroxy- or amino-alkyl-melamine modified melamine-formaldehyde condensation product comprises filtering the highly concentrated aqueous solution of the melamine-formaldehyde condensation product, forcing the filtrate through a spinneret, drying the extruded filaments in a drying shaft by means of hot air, and treating the dried filaments in a tempering oven at temperatures which rise gradually to a maximum temperature of from 160 to 250.degree. C. to cure the precondensate.
    Type: Grant
    Filed: October 9, 1997
    Date of Patent: June 29, 1999
    Assignee: BASF Aktiengesellschaft
    Inventors: Heinz Berbner, Hartmut Gihr, Uwe Rachwalsky, Hans Dieter Zettler