Patents by Inventor Karl Petz

Karl Petz 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 continuous preparation of esters of lower aliphatic carboxylic acids with lower alcohols
    Patent number: 5637761
    Abstract: In the esterification of aliphatic C.sub.2 -C.sub.6 -carboxylic acids with aliphatic C.sub.1 -C.sub.4 -alcohols, the ester formed is removed by azeotropic distillation together with the water of reaction. After the water of reaction has been separated in a separating condenser, the ester phase is freed, by washing with water, from acid carried over, and water and alcohol are then removed by distilling off a small fraction of the ester.In this way no salt-containing effluents are produced. The ester is obtained in a very good yield, free from acid and alcohol.
    Type: Grant
    Filed: November 30, 1992
    Date of Patent: June 10, 1997
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Karlheinz Miltenberger, Manfred Schmidt, Karl Petz
  • Dulling agent on the basis of wax for varnishes, and process for the manufacture thereof
    Patent number: 4342602
    Abstract: The invention provides a process for the manufacture of a polyethylene wax micro-powder, 99 weight % of which has a grain size of less than 15 microns, for the dulling of varnishes. Such a micro-powder generally cannot be obtained without difficulty by grinding; in accordance with the invention this is possible, however, by grinding the polyethylene wax together with an amide wax.
    Type: Grant
    Filed: October 15, 1980
    Date of Patent: August 3, 1982
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Karl Petz, Klaus Rieger, Dieter Steidl