Granted Patent
Utility
US 4,490,063 · App. 06/347,324
Telescopic tube and method for the manufacture thereof
Inventor:
Yrjo Aho
Patented Case
View Patent ↗
Granted: Dec 25, 1984
Filed: Feb 9, 1982
Inventor
Yrjo Aho
Assignee (at issue)
Exel Oy
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.