Cold weather breathing apparatus
US5706802A · kind A · utility
10Cited by
13References
18Claims
0Family size
Inventor
Key dates
| Filing date | Oct 24, 1996 |
| Grant date | Jan 13, 1998 |
| Priority date | — |
| Expiry date | Oct 24, 2016 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA62B9/003
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A breathing device including a heat exchanger module retained adjacent the mouth of a user by a fabric holder. The heat exchanger module includes a wall surrounding a non-linear, tubular flow passage extending between a first air vent and a second air vent. A heat exchanging medium comprising a woven copper cloth is disposed within the flow passage. The flow passage includes a larger cross-sectional area adjacent the first air vent than adjacent the second air vent.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.