Patents by Inventor Dieter Hollmann

Dieter Hollmann 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).

  • Method of producing dustfree silver nitrate
    Patent number: 5196178
    Abstract: In order to produce dustfree silver nitrate which can be readily dosed, silver nitrate is atomized in a molten state. A purity of the silver nitrate of greater than 99%, a pH of 2 to 6, and the exclusion of light during the atomizing are necessary.
    Type: Grant
    Filed: October 8, 1991
    Date of Patent: March 23, 1993
    Assignee: Degussa Aktiengesellschaft
    Inventors: Dieter Hollmann, Roland Gerner
  • Process for separation and purification of platinum group metals (II)
    Patent number: 4571265
    Abstract: There is described a process for the separation and purification of the platinum group metals from base metal out of acidic aqueous solutions. For this purpose there is used a substituted thiourea of the formulaR.sub.1 R.sub.2 N--CS--NH--CO--R.sub.3orR.sub.1 R.sub.2 N--CS--NH--COOR.sub.3as the precipitation agent. Preferably there are employed N,N-diaklyl-N'-benzoylthiourea wherein R.sub.1 and R.sub.2 are methyl, n-butyl, or n-hexyl.
    Type: Grant
    Filed: November 2, 1984
    Date of Patent: February 18, 1986
    Assignee: Degussa Aktiengesellschaft
    Inventors: Karl-Heinz Konig, Michael Schuster, Dieter Hollmann, Rainer Schlodder