Granted Patent
Utility
US 4,523,975 · App. 06/372,690
Integrated circuit planarizing process
Inventors:
Christopher K. Groves, Kevin R. Duncan, Edward C. D. Darwall
Patented Case
View Patent ↗
Granted: Jun 18, 1985
Filed: Apr 28, 1982
Inventors
Christopher K. Groves
Kevin R. Duncan
Edward C. D. Darwall
Assignee (at issue)
Mitel 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.