Granted Patent
Utility
US 5,683,507 · App. 08/523,303
Apparatus for growing large silicon carbide single crystals
Inventors:
Donovan L. Barrett, Raymond G. Seidensticker, Richard H. Hopkins
Patented Case
View Patent ↗
Granted: Nov 4, 1997
Filed: Sep 5, 1995
Inventors
Donovan L. Barrett
Raymond G. Seidensticker
Richard H. Hopkins
Assignee (at issue)
NORTHROP GRUMMAN 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.