Granted Patent
Utility
US 4,908,136 · App. 07/339,571
Method and apparatus for forming and ion-exchanging a filter cake
Inventors:
Tai-Sheng Chou, Thomas R. Kiliany
Patented Case
View Patent ↗
Granted: Mar 13, 1990
Filed: Apr 18, 1989
Inventors
Tai-Sheng Chou
Thomas R. Kiliany
Assignee (at issue)
Mobil Oil Corporation
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.