Patents by Inventor Helmut Knulle

Helmut Knulle 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).

  • Oval header heat exchanger
    Patent number: 4168744
    Abstract: A heat exchanger includes banks of double-pipe elements connected to oval headers, the opposite ends of which are connected by round transition elements to main headers. Each oval header and the respective transition elements are formed from a single, integral member, initially a cylindrical pipe, without connecting welds. The outer ends of the transition elements are reduced to form nipple elements for attachment to the main headers. The nipple elements have a greater wall thickness than the transition elements.
    Type: Grant
    Filed: June 22, 1977
    Date of Patent: September 25, 1979
    Assignee: Schmidt'sche Heissdampf-GmbH
    Inventors: Helmut Knulle, Harald Pieschke
  • Oval header heat exchanger and method of producing the same
    Patent number: 4130398
    Abstract: A heat exchanger includes banks of double-pipe elements connected to oval headers, the opposite ends of which are connected by round transition elements to main headers. Each oval header and the respective transition elements are formed from a single, integral member, initially a cylindrical pipe, without connecting welds. The outer ends of the transition elements are reduced to form nipple elements for attachment to the main headers. The nipple elements have a greater wall thickness than the transition elements.
    Type: Grant
    Filed: January 7, 1976
    Date of Patent: December 19, 1978
    Assignee: Schmidt'sche Heissdampf-GmbH
    Inventors: Helmut Knulle, Harald Pieschke