Granted Patent
Utility
US 5,578,232 · App. 08/434,951
Open-coil heater assembly and insulator therefor
Inventor:
Roger P. Engelke
Patented Case
View Patent ↗
Granted: Nov 26, 1996
Filed: May 4, 1995
Inventor
Roger P. Engelke
Assignee (at issue)
HART & COOLEY, INC.
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.