Granted Patent
Utility
US 4,828,800 · App. 06/788,659
System for trace gas detection
Inventor:
Bruce W. Castleman
Patented Case
View Patent ↗
Granted: May 9, 1989
Filed: Oct 16, 1985
Inventor
Bruce W. Castleman
Assignee (at issue)
Brunswick 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.