Granted Patent
Utility
US 5,254,607 · App. 07/721,794
Biodegradable, liquid impervious films
Inventors:
Robert K. McBride, James M. Adams, Peter I. Chang, Carl Douglas Ray
Patented Case
View Patent ↗
Granted: Oct 19, 1993
Filed: Jun 26, 1991
Inventors
Robert K. McBride
James M. Adams
Peter I. Chang
Carl Douglas Ray
Assignee (at issue)
Tredegar 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.