Patents by Inventor Nathan Waldman

Nathan Waldman 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).

  • Patent number: 4039601
    Abstract: Self-regenerative catalysts for dehydrogenating an alkylaromatic hydrocarbon to the corresponding alkenylaromatic hydrocarbon are continuously activated by steaming successive small portions of the catalyst bed during normal operation. Each small portion of the catalyst bed is steamed for about 7-30 minutes at least once every 24 hours by a separate small steam inlet which during the activation period admits a flow of steam sufficient to exclude hydrocarbon feed from that portion of the bed. The process is applicable to both heated case reactors and to adiabatic reactors using packed or radial beds. Reactors adapted for use of the process are described.
    Type: Grant
    Filed: June 22, 1976
    Date of Patent: August 2, 1977
    Assignee: The Dow Chemical Company
    Inventors: Frederick J. Soderquist, Theodore T. Wazbinski, Nathan Waldman