Optimizing RFID reader duty cycle or power to preserve...

Optimum electrolyte level sensing method and the automatic toppi

Opto-electronic apparatus for monitoring and detection of...

Opto-electronic security fence

Optoacoustic measuring arrangement and use thereof

Optoelectric safety system for a folding press

Oral drug compliance monitoring using radio frequency...

Organic clock generator

Organizer management system using R.F. identification

Orientation device

Orientation/time sensing alarm device for golf club

Oriented strand board product detecting apparatus using proximit

Ornamental vibration sensor device for burglar alarm system

Orthopaedic components with data storage element

Oscillator activated continuity testing switch

Out-of-liquid sensor, and liquid supply device using same

Out-of-range detector

Out-of-range personnel monitor and alarm

Out-of-range personnel monitor and alarm

Outage notification device and method