Patents by Inventor David LESSER

David LESSER 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).

  • Catalyst arrangement with optimized void fraction for the production of phthalic acid anhydride
    Patent number: 10155713
    Abstract: The invention relates to a catalyst arrangement for preparing phthalic anhydride by gas-phase oxidation of aromatic hydrocarbons, which comprises a reactor having a gas inlet end for a feed gas and a gas outlet end for a product gas and also a first catalyst zone made up of catalyst bodies and at least one second catalyst zone made up of catalyst bodies, where the first catalyst zone is arranged at the gas inlet end and the second catalyst zone is arranged downstream of the first catalyst zone in the gas flow direction and the length of the first catalyst zone in the gas flow direction is less than the length of the second catalyst zone in the gas flow direction, characterized in that the first catalyst zone has a higher gap content compared to the second catalyst zone.
    Type: Grant
    Filed: April 23, 2015
    Date of Patent: December 18, 2018
    Assignee: Clariant International Ltd.
    Inventors: Oliver Richter, Gerhard Mestl, David Lesser, Robert Marx, Nadine Fromm, Felix Schulz, Peter Schinke, Werner Pitschi
  • Catalyst Arrangement With Optimized Void Fraction For The Production Of Phthalic Acid Anhydride
    Publication number: 20170320803
    Abstract: The invention relates to a catalyst arrangement for preparing phthalic anhydride by gas-phase oxidation of aromatic hydrocarbons, which comprises a reactor having a gas inlet end for a feed gas and a gas outlet end for a product gas and also a first catalyst zone made up of catalyst bodies and at least one second catalyst zone made up of catalyst bodies, where the first catalyst zone is arranged at the gas inlet end and the second catalyst zone is arranged downstream of the first catalyst zone in the gas flow direction and the length of the first catalyst zone in the gas flow direction is less than the length of the second catalyst zone in the gas flow direction, characterized in that the first catalyst zone has a higher gap content compared to the second catalyst zone.
    Type: Application
    Filed: April 23, 2015
    Publication date: November 9, 2017
    Applicant: Clariant International Ltd.
    Inventors: Oliver RICHTER, Gerhard MESTL, David LESSER, Robert MARX, Nadine FROMM, Felix SCHULZ, Peter SCHINKE, Werner PITSCHI