Granted Patent
Utility
US 4,238,260 · App. 05/960,376
Method of making an elastomeric hose
Inventor:
Donald E. Washkewicz
Patented Case
View Patent ↗
Granted: Dec 9, 1980
Filed: Nov 13, 1978
Inventor
Donald E. Washkewicz
Assignee (at issue)
Parker-Hannifin 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.