Use indicator
Use of a subcarrier in an organic semiconductor radio...
Use of detector arrays to detect cessation of motion
Use of evaporatively activated color change for verifying...
Use of RFIDs to measure flow-rates of materials flowing...
Use of rotating magnetic field to enhance communication with...
Use of wing-fanning sounds to affect cockroach movement
User interface for electronic devices
User programmable portable proximity detector
User recognition system
Using carbon dioxide to indicate oxygen depletion
Using radio frequency identification to detect and/or...
Using radio frequency identification with...
Using unitary transmitting/receiving antenna
Utensil metal detector
Utility shut off apparatus
UV Exposure monitoring system
UV/IR fire detector with dual wavelength sensing IR channel