Patents by Inventor David C. Dalrymple

David C. Dalrymple 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: 4990275
    Abstract: A new copolymer composition comprising the hard segment of a polyimide and the soft segment of an oligomeric aliphatic polyester. The new polyimide copolymer membranes have exhibited high thermal stability for separation of an aromatic/saturate mixture. These new membranes have higher aromatic/saturate selectivity than polyurethanes.
    Type: Grant
    Filed: May 4, 1990
    Date of Patent: February 5, 1991
    Assignee: Exxon Research and Engineering Company
    Inventors: W. S. Winston Ho, Guido Sartori, Warren A. Thaler, David C. Dalrymple
  • Patent number: 4944880
    Abstract: A new copolymer composition comprising the hard segment of a polyimide and the soft segment of an oligomeric aliphatic polyester. The new polyimide copolymer membranes have exhibited high thermal stability for separation of an aromatic/saturate mixture. These new membranes have higher aromatic/saturate selectivity than polyurethanes.
    Type: Grant
    Filed: October 16, 1989
    Date of Patent: July 31, 1990
    Assignee: Exxon Research and Engineering Company
    Inventors: W. S. Winston Ho, Guido Sartori, Warren A. Thaler, David C. Dalrymple