Granted Patent
Utility
US 5,168,109 · App. 07/590,972
Process for preparing low inherent viscosity-high glass transition agents as an overpolymer on polyvinyl chloride resins
Inventors:
Richard H. Backderf, Frank J. Donat
Patented Case
View Patent ↗
Granted: Dec 1, 1992
Filed: Oct 1, 1990
Inventors
Richard H. Backderf
Frank J. Donat
Assignee (at issue)
B. F. Goodrich 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.