Granted Patent
Utility
US 5,927,989 · App. 08/909,346
Four-pan algebra balance having an imbalance correction mechanism
Inventors:
George Kung, Ken Vicchiollo
Patented Case
View Patent ↗
Granted: Jul 27, 1999
Filed: Aug 11, 1997
Inventors
George Kung
Ken Vicchiollo
Assignee (at issue)
Cuisenaire Company of America, Inc.
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.