Granted Patent
Utility
US 4,440,897 · App. 06/383,415
Process of making substantially external surfactant-free vinyl polymer emulsion products
Inventor:
Rudolf Maska
Patented Case
View Patent ↗
Granted: Apr 3, 1984
Filed: Jun 1, 1982
Inventor
Rudolf Maska
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.