Patents by Inventor Christian Steffens

Christian Steffens 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).

  • Diphosphines
    Patent number: 6566298
    Abstract: The invention relates to the preparation and use as catalysts of diphosphines of the formula (I) in which R is C6-C14-aryl or C4-C13-heteroaryl containing 1 to 3 heteroatoms selected from the group consisting of nitrogen, oxygen, and sulfur, wherein the aryl and heteroaryl radicals may optionally be substituted by halogen, C1-C6-alkyl, C1-C6-alkoxy, and/or trimethylsilyl, and R1 to R4, independently of one another, are each hydrogen, C1-C10-alkyl, C1-C10-alkoxy, F, Cl, or Br.
    Type: Grant
    Filed: August 15, 2002
    Date of Patent: May 20, 2003
    Assignee: Bayer Aktiengesellschaft
    Inventors: Birgit Driessen-Hölscher, Joachim Kralik, Inga Ritzkopf, Christian Steffens, Guido Giffels, Claus Dreisbach, Thomas Prinz, Walter Lange
  • Diphosphines
    Publication number: 20030045713
    Abstract: The invention relates to the preparation and use as catalysts of diphosphines of the formula (I) 1
    Type: Application
    Filed: August 15, 2002
    Publication date: March 6, 2003
    Inventors: Birgit Driessen-Holscher, Joachim Kralik, Inga Ritzkopf, Christian Steffens, Guido Giffels, Claus Dreisbach, Thomas Prinz, Walter Lange
  • Diphosphines
    Patent number: 6462200
    Abstract: The invention relates to the preparation and use as catalysts of diphosphines of the formula (I) in which R is C6-C14-aryl or C4-C13-heteroaryl containing 1 to 3 heteroatoms selected from the group consisting of nitrogen, oxygen, and sulfur, wherein the aryl and heteroaryl radicals may optionally be substituted by halogen, C1-C6-alkyl, C1-C6-alkoxy, and/or trimethylsilyl, and R1 to R4, independently of one another, are each hydrogen, C1-C10-alkyl, C1-C10-alkoxy, F, Cl, or Br.
    Type: Grant
    Filed: September 7, 2001
    Date of Patent: October 8, 2002
    Assignee: Bayer Aktiengesellschaft
    Inventors: Birgit Driessen-Hölscher, Joachim Kralik, Inga Ritzkopf, Christian Steffens, Guido Giffels, Claus Dreisbach, Thomas Prinz, Walter Lange
  • Diphosphines
    Publication number: 20020055653
    Abstract: The invention relates to the preparation and use as catalysts of diphosphines of the formula (I) 1
    Type: Application
    Filed: September 7, 2001
    Publication date: May 9, 2002
    Inventors: Birgit Driessen-Holscher, Joachim Kralik, Inga Ritzkopf, Christian Steffens, Guido Giffels, Claus Dreisbach, Thomas Prinz, Walter Lange
  • Read-only memory and fabrication method
    Patent number: 6303474
    Abstract: The read-only memory takes the form of an integrated circuit. The data stored in the read-only memory include a first data record and a second data record in the form of corresponding first and second structures, respectively, of the integrated circuit. The first structures are fabricated by means of a lithographic projection method with the use of a mask and the second structures are fabricated by means of a lithographic beam writing method without the use of a mask. The invention enables the storage of individual, specialized data for the read-only memory within a primarily mask-programmed ROM.
    Type: Grant
    Filed: January 31, 2000
    Date of Patent: October 16, 2001
    Assignee: Infineon Technologies AG
    Inventor: Christian Steffen