Granted Patent
Utility
US 4,950,456 · App. 07/249,255
Apparatus for analysis of a sample for sulphur
Inventors:
Alan R. Forster, Gregory J. Kamla
Patented Case
View Patent ↗
Granted: Aug 21, 1990
Filed: Sep 22, 1988
Inventors
Alan R. Forster
Gregory J. Kamla
Assignee (at issue)
SHELL OIL 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.