Patents by Inventor Richard M. Skena

Richard M. Skena 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).

  • N,N'bis(phthalic anhydride) diimides
    Patent number: 3962278
    Abstract: Thermoplastic imide polymers prepared from a dianhydride monomer containing imide linkages and at least two cyclic anhydride groups and an aromatic diamine such as 4,4'-diaminodiphenyl ether. Comonomers such as 3,4:3',4'-benzophenonecarboxylic dianhydride may be added. Preferably said dianhydride monomer containing imide linkages is made by reacting 4-aminophthalic acid with a dianhydride containing at least two cyclic anhydride groups, preferably in the ratio of about 2:1. Preferably said imide polymer is made by first forming a solution containing the diamine and adding the dianhydride monomer containing imide linkages while the temperature of the solution is maintained between 50.degree. and 120.degree.C. and most preferably at 110.degree.C.
    Type: Grant
    Filed: November 5, 1973
    Date of Patent: June 8, 1976
    Assignee: Westinghouse Electric Corporation
    Inventors: George M. Bower, Richard M. Skena
  • Polymers prepared from imide containing dianhydrides
    Patent number: 3954710
    Abstract: Thermoplastic imide polymers prepared from a dianhydride monomer containing imide linkages and at least two cyclic anhydride groups and an aromatic diamine such as 4,4'-diaminodiphenyl ether. Comonomers such as 3,4:3', 4'-benzophenonecarboxylic dianhydride may be added. Preferably said dianhydride monomer containing imide linkages is made by reacting 4-aminophthalic acid with a dianhydride containing at least two cyclic anhydride groups, preferably in the ratio of about 2:1. Preferably said imide polymer is made by first forming a solution containing the diamine and adding the dianhydride monomer containing imide linkages while the temperature of the solution is maintained between 50.degree. and 120.degree.C. and most preferably at 110.degree.C.
    Type: Grant
    Filed: November 5, 1973
    Date of Patent: May 4, 1976
    Assignee: Westinghouse Electric Corporation
    Inventors: George M. Bower, Richard M. Skena