Granted Patent
Utility
US 5,032,227 · App. 07/547,485
Production of paper or paperboard
Inventors:
Arthur P. Derrick, William Hatton
Patented Case
View Patent ↗
Granted: Jul 16, 1991
Filed: Jul 3, 1990
Inventors
Arthur P. Derrick
William Hatton
Assignee (at issue)
Vinings Industries, 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.