Granted Patent
Utility
US 4,489,609 · App. 06/447,717
Gyroscopes
Inventors:
James S. Burdess, Leonard Maunder
Patented Case
View Patent ↗
Granted: Dec 25, 1984
Filed: Dec 7, 1982
Inventors
James S. Burdess
Leonard Maunder
Assignee (at issue)
NATIONAL RESEARCH DEVELOPMENT 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.