Granted Patent
Utility
US 5,343,022 · App. 07/953,156
Pyrolytic boron nitride heating unit
Inventors:
Michael H. Gilbert, Sr., Timothy J. Hejl
Patented Case
View Patent ↗
Granted: Aug 30, 1994
Filed: Sep 29, 1992
Inventors
Michael H. Gilbert, Sr.
Timothy J. Hejl
Assignee (at issue)
ADVANCED CERAMIC X CORPORATION
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.