Granted Patent
Utility
US 4,818,489 · App. 06/935,611
Device for sampling breath air at the workplace
Inventors:
Winfried Gonner, Bruno Kolb, Gottfried Machata
Patented Case
View Patent ↗
Granted: Apr 4, 1989
Filed: Dec 2, 1986
Inventors
Winfried Gonner
Bruno Kolb
Gottfried Machata
Assignee (at issue)
Bodenseewerk Perkin-Elmer GmbH
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.