Patents by Inventor Rittmar Von Helmolt

Rittmar Von Helmolt 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).

  • Cooling system for a fuel cell battery
    Patent number: 6306533
    Abstract: A cooling system for a battery of fuel cells that contains at least two fuel cells, each of which comprises a membrane-electrode unit and two collector plates is disclosed. Cooling cards supplied with coolant and that are connected to one another via lines are thereby arranged between the individual fuel cell units.
    Type: Grant
    Filed: June 14, 1999
    Date of Patent: October 23, 2001
    Assignee: Siemens Aktiengesellschaft
    Inventors: Konrad Mund, Rittmar von Helmolt
  • Intermediate element for thermal, electrical and mechanical connection of two parts
    Patent number: 6299999
    Abstract: The invention is directed to an intermediate element for thermal, electrical and mechanical connection of two parts, particularly two fuel cells. The intermediate element is corrugated and each corrugation is respectively multiply interrupted along its wave hill/wave valley and is coined upward and downward in alternation.
    Type: Grant
    Filed: March 4, 1999
    Date of Patent: October 9, 2001
    Assignee: Siemens Aktiengesellschaft
    Inventors: Peter Buchner, Rittmar Von Helmolt, Georg Neumann, Horst Grüne
  • Magnetoresistive sensor utilizing a sensor material with a perovskite-like crystal structure
    Patent number: 5563331
    Abstract: A magnetoresistive sensor may be constructed with material having a perovskite-like crystal structure and an increased magnetoresistive effect. The material is based on the composition (A1).sub.1-x (A2).sub.x MnO.sub.z, with A1 (trivalent) selected from Y, La, or a lanthanide, A2 (bivalent) from an alkaline-earth metal or Pb, and with 0.1.ltoreq.x.ltoreq.0.9 and 2.0.ltoreq.z.ltoreq.3.5. The sensor contains a layer system with at least two layers with different materials, but in each case in the context of the aforesaid composition, which is selected so that the temperature correlation of the electrical resistance is relatively small. The two layers of the layer system can also be united into a single layer structure with a concentration gradient.
    Type: Grant
    Filed: September 26, 1994
    Date of Patent: October 8, 1996
    Assignee: Siemens Aktiengesellschaft
    Inventors: Rittmar Von Helmolt, Joachim Wecker
  • Method for preparing a structure having enhanced magnetoresistance, and use of the structure
    Patent number: 5498298
    Abstract: A method for preparing a structure having enhanced magneto-resistance, and use of the structure, in which it is possible to prepare a structure having enhanced magnetoresistance on the basis of the system of materials Cu--Co, especially for a magnetoresistive sensor. An intermediate of the structure is formed initially from an alloy having Cu mixed crystals supersaturated with Co by means of a rapid-solidification technique and this intermediate is subsequently converted by means of a predefined heat treatment into an end product of the desired structure having precipitations of or including Co in a Cu matrix.
    Type: Grant
    Filed: April 27, 1995
    Date of Patent: March 12, 1996
    Assignee: Siemens Aktiengesellschaft
    Inventors: Joachim Wecker, Rittmar Von Helmolt