About 5 Trademarks found that are filed by the law firm Porta Phone Co Inc.

system for establishing communication between the press box and the bench in football stadiums comprising head sets, interconnect cables, battery-operated power source, and wireless voice transceiver

system for establishing communication between the press box and the bench in football stadiums comprising head sets, interconnect cables, battery-operated power source, and wireless voice transceiver

Wireless communication device featuring voice, data and image transmission including voice, text and picture messaging, a video and still image camera, also functional to purchase music, games, video and software applications over the air for downloading to the device; Wireless communication devices for voice, data or image transmission

wired and wireless intercom communication systems comprised of headsets, cables, connectors, wireless transcievers, and batteries sold as a unit; headset hearing protectors, earmuffs, used to protect against ear damage in high noise environments

digital, two way wireless communication system that includes headset with boom microphone and beltpack radio transciever