Pedestrian traffic control system

Periodic waveform interference eliminator

Person paging method

Personal authentication system

Personal biometric key

Personal digital assistant key for an electronic lock

Personal identification apparatus using measured tactile...

Personal identification badge that resets on the removal of...

Personal medical device communication system and method

Personal or personalizable device for the conditional use of...

Personal security and electronic parking system

Personnel and vehicle identification system using three...

Phase modulation in RF tag

Phase shifters, interrogators, methods of shifting a phase...

Phase shifters, interrogators, methods of shifting a phase...

Piezoelectric reed power supply for use in abnormal tire conditi

Pilot lamp mechanism of a parking brake circuit

Pilot operated mud-pulse valve

Piston type underwater sound generator

Plant monitor-control apparatus