Granted Patent
Utility
US 6,835,923 · App. 09/987,987
Method and apparatus for self-monitoring of proximity sensors
Inventors:
Tiina Hamalainen, Henri Vähä-Ypyä, Risto Pirhonen, Vesa Peili
Patented Case
View Patent ↗
Granted: Dec 28, 2004
Filed: Nov 16, 2001
Inventors
Tiina Hamalainen
Henri Vähä-Ypyä
Risto Pirhonen
Vesa Peili
Assignee (at issue)
Nokia
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.