Granted Patent
Utility
US 5,501,981 · App. 08/027,145
Method and apparatus for chemiluminescent detection of sulfur
Inventors:
John D. Ray, Neil Johansen
Patented Case
View Patent ↗
Granted: Mar 26, 1996
Filed: Mar 5, 1993
Inventors
John D. Ray
Neil Johansen
Assignee (at issue)
Sievers Instruments, 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.