Granted Patent
Utility
US 4,874,657 · App. 06/933,951
Methods of producing biaxially-oriented polymer product, and the product produced thereby
Inventors:
Ying-Cheng Lo, Darral V. Humphries
Patented Case
View Patent ↗
Granted: Oct 17, 1989
Filed: Nov 24, 1986
Inventors
Ying-Cheng Lo
Darral V. Humphries
Assignee (at issue)
Kusan, 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.