Patents by Inventor Ewald Preisegger

Ewald Preisegger 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).

  • Sterilant gas mixture comprising alkylene oxide and 1,1,1,2,3,3,3-heptafluoropropane
    Patent number: 5510377
    Abstract: A sterilant gas mixture is presented for cold-gas sterilization, which comprises alkene oxide and 1,1,1,2,3,3,3-heptafluoropropane.The sterilant gas mixture comprises from 12 to 22 mol % of ethylene oxide or propylene oxide and from 78 to 88 mol % of 1,1,1,2,3,3,3-heptafluoropropane.
    Type: Grant
    Filed: January 11, 1995
    Date of Patent: April 23, 1996
    Assignee: Hoechst AG
    Inventors: Hans-Matthias Deger, Rainer Henrici, Ewald Preisegger
  • Method and device for the thermal shock test
    Patent number: 5167451
    Abstract: The invention relates to a method for testing objects by thermal shock in a closed apparatus, comprising the following, preferably repeated steps:a) introducing the object to be tested into the apparatus,b) cooling the object by immersion in a liquid cold bath,c) drying the object above at least one cold trap or in at least one drying chamber,d) heating the object by immersion in a liquid hot bath ande) drying the object above at least one cold trap or in at least one drying chamber,the temperature difference between the hot bath and cold bath being 50 to 500 K., the temperature of the cold trap being 5-30 K. lower than the temperature of the cold bath and the temperature of the drying chamber being 10 to 50.degree. C. higher than the temperature of the hot bath, and the steps b) to e) being carried out in mutually separated parts of the apparatus, which are connected to one another via closable openings. The invention also relates to a device for testing objects by thermal shock.
    Type: Grant
    Filed: August 8, 1991
    Date of Patent: December 1, 1992
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Walter Muller, Joachim Naumann, Ewald Preisegger, Martin Schnauber
  • Filler for sensor systems of temperature-sensitive displacement pickups
    Patent number: 5146016
    Abstract: 2H-heptafluoropropane (HFC 227) is used as filler in sensor systems of temperature-sensitive displacement pickups.
    Type: Grant
    Filed: September 16, 1991
    Date of Patent: September 8, 1992
    Assignee: Hoechst Aktiengesellschaft
    Inventors: Ewald Preisegger, Wolfgang Scholten, Thomas Muller
  • Process for the recovery of solvents in the treatment of textiles
    Patent number: 4583985
    Abstract: In this process the organic solvents which are obtained in a liquid state in the drying phase are pumped away. The solvents present in the form of a solvent vapor/air mixture are partially condensed by cooling and the fractions of solvent still remaining in vapor form are adsorbed by active charcoal. These adsorbed solvents are recovered by setting up a saturation partial pressure of the solvent in the solvent vapor/air mixture of not more than 0.25 bar. The fractions of solvent adsorbed in the active charcoal are desorbed by means of a solvent vapor/air mixture of the same concentration as in the adsorption process and at temperatures of approx. 100.degree. to 150.degree. C.
    Type: Grant
    Filed: June 28, 1984
    Date of Patent: April 22, 1986
    Assignee: Hoechst Aktiengesellschaft
    Inventor: Ewald Preisegger