Snorkel
US4896664A · kind A · utility
22Cited by
11References
6Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Apr 4, 1989 |
| Grant date | Jan 30, 1990 |
| Priority date | — |
| Expiry date | Apr 4, 2009 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB63C11/184
- WIPO fieldTransport
- WIPO sectorMechanical engineering
Abstract
A snorkel device for breathing under the surface of water which will allow both inhaling and exhaling of air underwater. A multiplicity of water impermeable tubes, permeable to dissolved or gaseous oxygen, allow underwater passage of oxygen into the snorkel. Preferred tube material is porous expanded polytetrafluoroethylene.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.