Granted Patent
Utility
US 3,985,124 · App. 05/562,302
Spirometer
Inventor:
Steven J. Coleman
Patented Case
View Patent ↗
Granted: Oct 12, 1976
Filed: Mar 26, 1975
Inventor
Steven J. Coleman
Assignee (at issue)
Thermo Electron 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.