Granted Patent
Utility
US 5,002,421 · App. 06/903,210
Connection for successive sections of a helical spring like conveying elements
Inventor:
Luc Noel de Vrieze
Patented Case
View Patent ↗
Granted: Mar 26, 1991
Filed: Sep 2, 1986
Inventor
Luc Noel de Vrieze
Assignee (at issue)
Elite N.V.
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.