Patents by Inventor Robert M. Graff

Robert M. Graff 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).

  • Process for improving thermoformability of methyl methacrylate polymers and the improved compositions
    Patent number: 3950314
    Abstract: Compositions comprising methyl methacrylate polymers and copolymers containing about 0.0002 to 0.004 moles, based on metal, per 1000 grams of polymer, of a compound of certain metal compounds effective to prevent bubble formation at thermoforming temperatures. Also disclosed is a process for improving the thermoformability of methyl methacrylate polymers comprising introducing said compound in the monomer system before polymerization.
    Type: Grant
    Filed: June 17, 1974
    Date of Patent: April 13, 1976
    Assignee: Rohm and Haas Company
    Inventor: Robert M. Graff