Granted Patent
Utility
US 5,156,780 · App. 07/554,263
process for treating a porous substrate to achieve improved water and oil repellency
Inventors:
Yitzchak Kenigsberg, Ehud Shchori
Patented Case
View Patent ↗
Granted: Oct 20, 1992
Filed: Jul 18, 1990
Inventors
Yitzchak Kenigsberg
Ehud Shchori
Assignee (at issue)
Gelman Sciences
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.