Granted Patent
Utility
US 5,811,038 · App. 08/722,506
Method of blending components for porous plastic pipe processing
Inventor:
William S. Mitchell
Patented Case
View Patent ↗
Granted: Sep 22, 1998
Filed: Sep 27, 1996
Inventor
William S. Mitchell
Assignee (at issue)
Plastic Specialties and Technologies Investments, 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.