Granted Patent
Utility
US 4,855,113 · App. 06/923,240
Apparatus for removing sulfur from organic polysulfides
Inventor:
Jeffrey H. Yen
Patented Case
View Patent ↗
Granted: Aug 8, 1989
Filed: Oct 27, 1986
Inventor
Jeffrey H. Yen
Assignee (at issue)
Pennwalt 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.