Granted Patent
Utility
US 5,239,030 · App. 07/422,275
Amine/propylene copolymers
Inventors:
Andrew J. Sivak, Leonard A. Cullo, William L. Krayer
Patented Case
View Patent ↗
Granted: Aug 24, 1993
Filed: Oct 16, 1989
Inventors
Andrew J. Sivak
Leonard A. Cullo
William L. Krayer
Assignee (at issue)
Aristech Chemical 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.