Patents by Inventor Rolf Schrawer

Rolf Schrawer 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).

  • Safety insert for storage vessels of low-boiling liquified gases
    Patent number: 4187956
    Abstract: A safety insert for storage vessels of low-boiling liquified gases includes a safety neck tube placed within the neck forming an annular space with respect thereto, the neck having a blind flange with a fill and extraction hole for the gas as well as a safety valve and vent pipe with a stopcock mounted onto the neck and with a gas outlet hole in the safety neck tube.
    Type: Grant
    Filed: October 6, 1978
    Date of Patent: February 12, 1980
    Assignee: Messer Griesheim GmbH
    Inventors: Rolf Schrawer, Werner K. Diehl, Hans M. Ringelstein
  • Process for the production of slush of low-boiling gases
    Patent number: 4009013
    Abstract: A process for preparing fine-grained slush of low-boiling gases is characterized in that the liquefied gas or the very cold gas under high pressure is relieved from stress in a nozzle alternately first to a pressure below the pressure of the triple point in the gas-ice range and subsequently to a pressure above the pressure of the triple point in gas-liquid range.
    Type: Grant
    Filed: May 12, 1975
    Date of Patent: February 22, 1977
    Assignee: Messer Griesheim GmbH
    Inventors: Rolf Schrawer, Josef Bardenheier, Jurgen Koch
  • Process for cooling by means of a cryogen slush
    Patent number: 3994141
    Abstract: A process for cooling by means of a low-boiling gas comprises the steps of continuously producing a gas slush and conveying it from the location of its production to the place of consumption. The gas slush releases its heat of fusion at the place of consumption and becomes a triple-point liquid. The liquid is returned to the location of production to produce fresh slush.
    Type: Grant
    Filed: May 12, 1975
    Date of Patent: November 30, 1976
    Assignee: Messer Griesheim GmbH
    Inventor: Rolf Schrawer