Granted Patent
Utility
US 4,974,467 · App. 07/415,985
Stepped ring gear
Inventor:
Graeme M. Cundy
Patented Case
View Patent ↗
Granted: Dec 4, 1990
Filed: Oct 2, 1989
Inventor
Graeme M. Cundy
Assignee (at issue)
Maxwell Marine Limited
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.