Granted Patent
Utility
US 5,249,953 · App. 07/971,673
Gas distributing and infrared radiating block assembly
Inventor:
Reinhold C. Roth
Patented Case
View Patent ↗
Granted: Oct 5, 1993
Filed: Nov 4, 1992
Inventor
Reinhold C. Roth
Assignees (at issue)
Hercules Canada, Inc.
285550 British Columbia Ltd.
285562 British Columbia Ltd.
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.