Granted Patent
Utility
US 4,534,944 · App. 06/546,886
Mercury vapor suppressant
Inventor:
Richard H. Roydhouse
Patented Case
View Patent ↗
Granted: Aug 13, 1985
Filed: Oct 31, 1983
Inventor
Richard H. Roydhouse
Assignee (at issue)
Environmental Protection Systems, 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.