Granted Patent
Utility
US 5,248,253 · App. 07/826,860
Thermal processing furnace with improved plug flow
Inventors:
Ara Philipossian, Edward W. Culley
Patented Case
View Patent ↗
Granted: Sep 28, 1993
Filed: Jan 28, 1992
Inventors
Ara Philipossian
Edward W. Culley
Assignee (at issue)
Digital Equipment 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.