Granted Patent
Utility
US 4,725,505 · App. 06/906,473
Polybutylene blend for form and fill film packaging
Inventors:
Charles C. Hwo, Masaki Kohyama
Patented Case
View Patent ↗
Granted: Feb 16, 1988
Filed: Sep 12, 1986
Inventors
Charles C. Hwo
Masaki Kohyama
Assignee (at issue)
SHELL OIL COMPANY
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.