Granted Patent
Utility
US 6,041,476 · App. 08/975,728
Inverted block and tackle window balance
Inventor:
Richard S. deNormand
Patented Case
View Patent ↗
Granted: Mar 28, 2000
Filed: Nov 21, 1997
Inventor
Richard S. deNormand
Assignee (at issue)
CALDWELL MANUFACTURING COMPANY
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.