Patents by Inventor Wolfgang Zilske

Wolfgang Zilske 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).

  • Cyanide-free electroplating bath for the deposition of gold and gold alloys
    Patent number: 6165342
    Abstract: Cyanide-free electroplating baths for deposition of gold and gold alloy coatings, using sulphurous gold complexes that are stable for a relatively long time, can be used with current density over 1 A/dm.sup.2 and are practically odor-free, are obtained when the sulphurous compounds used are mercaptosulfonic acids, dye sulfide sulfonic acids or salts thereof.
    Type: Grant
    Filed: June 2, 1998
    Date of Patent: December 26, 2000
    Assignee: Degussa Huls Aktiengesellschaft
    Inventors: Werner Kuhn, Wolfgang Zilske
  • Platinum plating bath
    Patent number: 5620583
    Abstract: Crack-free, bright platinum layers with thicknesses of more than 100 .mu.m are obtained from electroplating baths which contain 5 to 30 g/l platinum as amminesulphamato complex and 20 to 400 g of a strong acid if the content of free amidosulphuric acid amounts to less than 5 g/l.
    Type: Grant
    Filed: March 27, 1996
    Date of Patent: April 15, 1997
    Assignee: Degussa Aktiengesellschaft
    Inventors: Werner Kuhn, Wolfgang Zilske
  • Galvanic gold alloying bath
    Patent number: 5006208
    Abstract: Yellow to rose-colored gold alloy coatings with copper and silver are obtained from stable galvanic baths with a pH of 8.5 to 11 containing, 1 to 15 g/liter gold as potassium gold (I) cyanide, 5 to 50 g/liter copper as potassium copper (I) cyanide, 0.05 to 5 g/liter silver as potassium silver (I) cyanide and dipotassium hydrogenphosphate as well as alkali cyanides in amounts of up to 10 g/liter and 0.1-1 mg/liter potassium selenocyanate.
    Type: Grant
    Filed: August 29, 1990
    Date of Patent: April 9, 1991
    Assignee: Degussa Aktiengesellschaft
    Inventors: Werner Kuhn, Wolfgang Zilske
  • Process for the treatment of stainless steel for a direct galvanic gold plating
    Patent number: 4659438
    Abstract: For the direct gold plating of stainless steel parts in acid baths there is needed a pretreatment of the parts. Known processes operate with corrosive media such as strong acids and attack the surface. These disadvantages are avoided by putting the stainless steel part in an electrolytic, aqueous solution and first treating cathodically and subsequently anodically.
    Type: Grant
    Filed: May 14, 1981
    Date of Patent: April 21, 1987
    Assignee: Degussa Aktiengesellschaft
    Inventors: Werner Kuhn, Wolfgang Zilske
  • Process and bath for the electrolytic deposition of gold-tin alloy coatings
    Patent number: 4634505
    Abstract: To produce electrolytic deposition of glossy gold/tin alloys there are employed baths having a pH below 3 which contain 1 to 20 g/l gold in the form of tetracyanoaurate (III), 0.1 to 10 g/l tin, an acid and a conducting salt, whereby the tin is in the form of a tin (IV)-oxalato complex.
    Type: Grant
    Filed: February 26, 1986
    Date of Patent: January 6, 1987
    Assignee: Degussa AG
    Inventors: Werner Kuhn, Wolfgang Zilske
  • Bath and process for the electrolytic deposition of gold-indium alloys
    Patent number: 4617096
    Abstract: Light yellow, glossy and ductile gold-indium alloys which have a good resistance to gradual corrosion by silver sulfide are obtained from electrolytic (galvanic) baths containing 1 to 20 g/l of gold in the form of alkali or ammonium tetracyanoaurate (III), 0.5-50 g/l of indium in the form of a water soluble indium salt, a buffer or conducting salt and 0.5 to 10 mg/l of selenium and/or tellurium.
    Type: Grant
    Filed: January 28, 1986
    Date of Patent: October 14, 1986
    Assignee: Degussa Aktiengesellschaft
    Inventors: Werner Kuhn, Wolfgang Zilske
  • Electrolytic palladium bath and process
    Patent number: 4411743
    Abstract: There is described an electrolytic palladium bath containing palladium sulfite and an acid which produces coatings that satisfy all industrial requirements and which is not corrosive to the base metal. The bath contains sulfuric and/or phosphoric acid and employs 80-95% of palladium as palladium sulfate, the balance as palladium sulfite.
    Type: Grant
    Filed: April 22, 1982
    Date of Patent: October 25, 1983
    Assignee: Degussa
    Inventors: Erika Kreuter, Wolfgang Zilske
  • Electrolytic bath for the deposition of rhodium coatings
    Patent number: 4402802
    Abstract: There is described an electrolytic bath for the deposition of haze-free glossy rhodium coatings which furnish a white gold-like tint and low tension flims. This bath in addition to rhodium sulfate or phosphate, sulfuric acid and/or phosphoric acid also contains a sulfonic acid, especially an aromatic sulfonic acid, as for example, phenolsulfonic acid.
    Type: Grant
    Filed: January 15, 1982
    Date of Patent: September 6, 1983
    Assignee: Dequssa Aktiengesellschaft
    Inventors: Erika Kreuter, Werner Kuhn, Wolfgang Zilske
  • Electrolytic bath and process for the deposition of gold alloy coatings
    Patent number: 4391679
    Abstract: In the electro industry, there are needed acid gold alloy baths which give glossy, ductile coatings, operate at high current densities, and contain little non-metallic impurities. This is attained by a bath based on potassium cyanoaurate (III) and an acid whereby the bath contains at least one of the alloying metals cobalt, nickel, indium, tin, zinc, or cadmium in the form of a water soluble salt, together with an amine, an aminocarboxylic acid, or a phosphonic acid and has a pH of below 3.
    Type: Grant
    Filed: April 2, 1981
    Date of Patent: July 5, 1983
    Assignee: Degussa Aktiengesellschaft
    Inventors: Wolfgang Zilske, Werner Kuhn
  • Alkaline bath for the electrolytic deposition of low carat yellow colored gold alloy layers
    Patent number: 4358351
    Abstract: For the production of low carat rose to gold colored gold alloy coatings there are needed electrolytic baths containing soluble gold cyanide, soluble copper cyanide, potassium carbonate or potassium bicarbonate which produce corrosion resistant coatings of 13-18 carats and no physiologically hazardous cadmium. The baths of the present invention contain, in place of cadmium, 7.5 to 40 grams/liter of zinc as complex zinc cyanide.
    Type: Grant
    Filed: May 22, 1981
    Date of Patent: November 9, 1982
    Assignee: Degussa Aktiengesellschaft
    Inventors: Franz Simon, Werner Huth, Bernd Dorbath, Wolfgang Zilske
  • Process for the electrolytic deposition of gold and gold alloy coatings and compositions therefore
    Patent number: 4274927
    Abstract: For the electrolytic deposition of gold alloys there is required a process with which low carat coatings can be deposited which nevertheless have a high resistance to tarnish. Such coatings are obtained from electrolytes which consist of a salt melt and contain gold salts, alkali thiocyanate and salts of one or more alloyings elements as constituents. Preferably the electrolyte contains per liter of salt melt 0.5 to 20 grams of gold, up to 300 grams of Cu, Zn, Sn, Cd, Ni, Ag, Pd, Ru and/or Pt, up to 200 grams of alkali cyanide and/or water.
    Type: Grant
    Filed: March 31, 1980
    Date of Patent: June 23, 1981
    Assignee: Degussa Aktiengesellschaft
    Inventors: Franz Simon, Wolfgang Zilske, Manfred Schmidt