Granted Patent
Utility
US 6,748,093 · App. 09/839,227
Hearing aid with a tightening ring
Inventor:
Jan Tøpholm
Patented Case
View Patent ↗
Granted: Jun 8, 2004
Filed: Apr 23, 2001
Inventor
Jan Tøpholm
Assignee (at issue)
Tøpholm & Westermann APS
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.