Protective cover for sound transducers located in face masks of divers
US4123622A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Apr 14, 1977 |
| Grant date | Oct 31, 1978 |
| Priority date | — |
| Expiry date | Apr 14, 1997 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04R1/083
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A moisture protective housing for a sound transducer located inside the face mask of a diver which face mask is vented to a breathing apparatus, such as a scuba tank with regulator, to maintain the air breathed by the diver at substantially the same pressure as the water surrounding the diver. The housing includes a deformable portion having pin prick perforations or pores therethrough to make that portion porous when formed. The number of perforations or pores, as well as their size, are selected such that the porous portion becomes permeable to air and/or water only if the pressure differential across it exceeds a preselected value.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.