Granted Patent
Utility
US 5,162,420 · App. 07/707,250
Aqueous compositions based on acid-functional acrylic silanol polymers
Inventors:
Wen-Hsuan Chang, Edward E. McEntire, Marvin L. Kaufman
Patented Case
View Patent ↗
Granted: Nov 10, 1992
Filed: May 22, 1991
Inventors
Wen-Hsuan Chang
Edward E. McEntire
Marvin L. Kaufman
Assignee (at issue)
PPG 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.