Granted Patent
Utility
US 6,457,548 · App. 09/510,851
Passive radiator with mass elements
Inventor:
Guido Odilon Maurits D'Hoogh
Patented Case
View Patent ↗
Granted: Oct 1, 2002
Filed: Feb 23, 2000
Inventor
Guido Odilon Maurits D'Hoogh
Assignee (at issue)
KONINKLIJKE PHILIPS ELECTRONICS NV
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.