Granted Patent
Utility
US 4,899,243 · App. 07/130,254
Flat spring structure for magnetic tape cassettes, in particular video cassettes
Inventor:
Abramo Bordignon
Patented Case
View Patent ↗
Granted: Feb 6, 1990
Filed: Dec 8, 1987
Inventor
Abramo Bordignon
Assignee (at issue)
A.T.B. S.p.A.
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.