Granted Patent
Utility
US 5,109,051 · App. 07/492,702
Aluminosilicate compositions as partial replacement for titanium dioxide in pigmented polyvinyl chloride and polyvinyl chloride type compositions
Inventors:
William J. Kroenke, Ervin J. Williger
Patented Case
View Patent ↗
Granted: Apr 28, 1992
Filed: Mar 13, 1990
Inventors
William J. Kroenke
Ervin J. Williger
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.