Granted Patent
Utility
US 5,264,494 · App. 07/700,667
Halogenated butyl rubber graft copolymers
Inventors:
Chai H. Ho, William Hopkins
Patented Case
View Patent ↗
Granted: Nov 23, 1993
Filed: May 15, 1991
Inventors
Chai H. Ho
William Hopkins
Assignee (at issue)
Polysar Rubber 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.