Granted Patent
Utility
US 4,808,147 · App. 07/057,755
Adjustable bottom bracket assembly for bicycles
Inventor:
David Graham
Patented Case
View Patent ↗
Granted: Feb 28, 1989
Filed: Jun 3, 1987
Inventor
David Graham
Assignee (at issue)
Cannondale 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.