Granted Patent
Utility
US 4,568,579 · App. 06/548,386
Asymmetrical layered structures of polyalkylene sulfone resins
Inventor:
Barry Watson
Patented Case
View Patent ↗
Granted: Feb 4, 1986
Filed: Nov 3, 1983
Inventor
Barry Watson
Assignee (at issue)
Owens-Illinois Inc.
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.