Patents by Inventor Rainer Schlodder

Rainer Schlodder 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 recovery of noble metals from solutions
    Patent number: 4687514
    Abstract: There is described a process for the recovery of noble metals from dilute aqueous or non-aqueous solution which contain salts of non-noble metals and/or difficulty volatile inorganic or organic compounds, which is generally usable, simple to carry out and supplies high yields of noble metals. There is added to the noble metal solution elemental tellurium or a reducible tellurium compound at a temperature of 100.degree. to 250.degree. C. and the precipitate formed worked up in known manner.
    Type: Grant
    Filed: June 9, 1983
    Date of Patent: August 18, 1987
    Assignee: Degussa Aktiengesellschaft
    Inventors: Hermann Renner, Karlheinz Kleiss, Rainer Schlodder
  • 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
  • Process for separation and purification of platinum group metals (I)
    Patent number: 4571266
    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 extraction agent. Preferably there are employed N,N-dialkyl-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, Gerd Schneeweis, Bernd Steinbrech, Rainer Schlodder
  • Method and electrolytic bath for the deposition of low carat bright gold-silver alloy coatings
    Patent number: 4487664
    Abstract: Bright, low carat gold-silver-alloy coatings which are ductile and have a thickness up to over 100 .mu.m are obtained from an electrolytic bath containing 0.5 to 25 g/l of gold in the form of alkali gold cyanide, 0.25 to 15 g/l of silver in the form of alkali silver cyanide and 10 to 200 g/l of alkali cyanide as well as 0.001 to 5 g/l of tellurium in the form of a water soluble tellurium compound.
    Type: Grant
    Filed: March 13, 1984
    Date of Patent: December 11, 1984
    Assignee: Degussa Aktiengesellschaft
    Inventors: Bernd Dorbath, Rainer Schlodder, Norbert Giesecke