Patents by Inventor Walter Voelkl

Walter Voelkl 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).

  • Regenerable electric capacitor
    Patent number: 4215385
    Abstract: In a regenerable electric capacitor, particularly for a.c. voltage applications, the metal coatings consist of an alloy of aluminum and a metal whose oxides possess a specific resistance .rho.<10.sup.9 .OMEGA.cm. Alloy metals are preferably copper or zinc, and maganese, tin, silver, chromium, iron or lead are also suitable. With the alloy of the invention, the coating decomposition is prevented by the increased edge field strengths.
    Type: Grant
    Filed: December 23, 1977
    Date of Patent: July 29, 1980
    Assignee: Siemens Aktiengesellschaft
    Inventors: Reinhard Behn, Gerhard Hoyler, Walter Voelkl
  • Regenerable electric capacitor
    Patent number: 4142222
    Abstract: A capacitor for AC voltage applications consists of staggered wound layers of synthetic material films metallized on both sides. The metallizations are carried out on the two sides of the films with differing thicknesses, wherein at least the greater thickness metallization is contacted by means of Schoop layers. The exposed edges on the two sides of the films are provided with different widths, wherein the difference corresponds with a staggering of the films during winding.
    Type: Grant
    Filed: May 5, 1977
    Date of Patent: February 27, 1979
    Assignee: Siemens Aktiengesellschaft
    Inventors: Josef Kotschy, Walter Voelkl
  • Corrosion-resistant regenerable electrical capacitor
    Patent number: 4019101
    Abstract: An electrical capacitor in which metallized foils are loosely disposed one on top of the other and in which the dielectric layer is formed of materials which have desirable electrical properties but which are not particularly adapted to regeneration having a metallized surface which is insulated against the moisture by a liquid insulating oil. The insulating oil layer may consist of polyisobutylene or a silicone oil. A solvent is used to apply the oil and the solvent is given the opportunity to evaporate after the application.
    Type: Grant
    Filed: June 26, 1975
    Date of Patent: April 19, 1977
    Assignee: Siemens Aktiengesellschaft
    Inventors: Karl-Heinz Preissinger, Walter Voelkl, Willi Weber, Ulrich Wehnelt