Granted Patent
Utility
US 4,293,105 · App. 05/907,427
Bi-level web sensitive retractor
Inventor:
Per Olaf Weman
Patented Case
View Patent ↗
Granted: Oct 6, 1981
Filed: May 19, 1978
Inventor
Per Olaf Weman
Assignee (at issue)
Allied Chemical 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.