Ultrasonic image conversion
Ultrasonic recognition system on digital communication
Ultrasonic wave transmitting system
Underwater acoustic absorber
Underwater imaging system
Underwater switching
Underwater transponder calibration arrangement
Underwater viewing system
Universal barrier operator transmitter
Universal garage door operating system and method
Universal garage door operating system and method
Universal hands free key and lock system
Unlock operation system of a vehicle door
Unlocking system for automobile vehicle doors and the like
Use management method and processing apparatus
Use management method and processing apparatus
Use of isotopes to provide information to an article
Use-authorization device for security-related applications
User authentication method and apparatus
User authentication system using biometric information