Communication apparatus for use in hazardous environments
US4885796A · kind A · utility
Inventors
Key dates
| Filing date | Apr 19, 1985 |
| Grant date | Dec 5, 1989 |
| Priority date | — |
| Expiry date | Apr 19, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04B2001/3866
- WIPO fieldTelecommunications
- WIPO sectorElectrical engineering
Abstract
Included in the communication apparatus are a face mask covering the eyes, the nose, and mouth of the user and which has a frame holding a transparent viewing shield with a peripheral resilient seal on the frame bearing against the user's face. A relatively low power transmitter is positioned inside the mask adjacent to the air inlet for transmitting a short range signal carrying a communication from the user. A relatively high powered transceiver is carried on the user's person. The communication apparatus also includes a receiver also carried on the user's person tuned to receive the signal of the low powered transmitter and providing an audio output. A voice actuated switch is responsive to the output of the receiver to switch the transceiver from its receiving mode to its transmitting mode. A cable interconnects the voice actuated switch and the transceiver to switch the transceiver between its modes and to supply the output of the receiver as the audio input to the transceiver, so that the user is enabled to communicate with remote receivers tuned to the frequency of the transceiver without comprising the integrity of the face mask shield or interrupting the seal about the per…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.