Granted Patent
Utility
US 4,267,890 · App. 06/149,193
Fire extinguishing system including sensor comparable to determine charge
Inventors:
Jimmy D. Myers, Lawrence F. Fratzke
Patented Case
View Patent ↗
Granted: May 19, 1981
Filed: May 12, 1980
Inventors
Jimmy D. Myers
Lawrence F. Fratzke
Assignee (at issue)
Caterpillar Tractor Co.
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.