Granted Patent
Utility
US 4,386,183 · App. 06/254,833
Release coatings based on polyvinyl alcohol
Inventor:
Lawrence K. Wempe
Patented Case
View Patent ↗
Granted: May 31, 1983
Filed: Apr 16, 1981
Inventor
Lawrence K. Wempe
Assignee (at issue)
Air Products and Chemicals, 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.