Granted Patent
Utility
US 6,112,847 · App. 09/267,395
Loudspeaker with differentiated energy distribution in vertical and horizontal planes
Inventor:
Richard Lehman
Patented Case
View Patent ↗
Granted: Sep 5, 2000
Filed: Mar 15, 1999
Inventor
Richard Lehman
Assignee (at issue)
CLAIR BROTHERS AUDIO ENTERPRISES, 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.