Granted Patent
Utility
US 4,520,179 · App. 06/419,869
Preparation of vinylpyrrolidone/vinyl acetate copolymers of various molecular weights using a single initiator system consisting essentially of t-Butylperoxypivalate
Inventors:
Eugene S. Barabas, James R. Cho
Patented Case
View Patent ↗
Granted: May 28, 1985
Filed: Sep 20, 1982
Inventors
Eugene S. Barabas
James R. Cho
Assignee (at issue)
GAF Corporation
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.