Granted Patent
Utility
US 4,281,730 · App. 06/112,224
Scale
Inventors:
Burt L. Swersey, Peter Fried
Patented Case
View Patent ↗
Granted: Aug 4, 1981
Filed: Jan 15, 1980
Inventors
Burt L. Swersey
Peter Fried
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.