Granted Patent
Utility
US 4,256,052 · App. 06/081,193
Temperature gradient means in reactor tube of vapor deposition apparatus
Inventors:
Raymond V. Johnson, Dennis P. Biondi
Patented Case
View Patent ↗
Granted: Mar 17, 1981
Filed: Oct 2, 1979
Inventors
Raymond V. Johnson
Dennis P. Biondi
Assignee (at issue)
RCA 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.