Granted Patent
Utility
US 4,238,539 · App. 06/043,553
Fiber reinforced composite shaft with metallic connector sleeves mounted by a knurl interlock
Inventors:
Derek N. Yates, John C. Presta
Patented Case
View Patent ↗
Granted: Dec 9, 1980
Filed: May 29, 1979
Inventors
Derek N. Yates
John C. Presta
Assignee (at issue)
Celanese GmbH
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.