Granted Patent
Utility
US 4,090,680 · App. 05/674,539
Web leader, web winding methods and wound web with leader
Inventor:
Irving Karsh
Patented Case
View Patent ↗
Granted: May 23, 1978
Filed: Apr 7, 1976
Inventor
Irving Karsh
Assignee (at issue)
Bell and Howell, LLC
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.