Granted Patent
Utility
US 4,322,964 · App. 06/112,135
Gas analyzer calibration apparatus
Inventors:
Hans L. Melgaard, Gary Mercier
Patented Case
View Patent ↗
Granted: Apr 6, 1982
Filed: Jan 14, 1980
Inventors
Hans L. Melgaard
Gary Mercier
Assignee (at issue)
Despatch Industries Limited Partnership
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.