Granted Patent
Utility
US 5,015,690 · App. 07/316,877
Thermoplastic modifier compositions which imparts improved appearance and impact properties to molded thermoplastics
Inventor:
William G. Williams
Patented Case
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Granted: May 14, 1991
Filed: Feb 28, 1989
Inventor
William G. Williams
Assignee (at issue)
Copolymer Rubber & Chemical Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.