Granted Patent
Utility
US 6,618,481 · App. 09/637,588
Method for improving acoustic sidetone suppression in hands-free telephones
Inventor:
Gerhard Schmidt
Patented Case
View Patent ↗
Granted: Sep 9, 2003
Filed: Aug 14, 2000
Inventor
Gerhard Schmidt
Assignee (at issue)
Infineon Technologies AG
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.