Normally open anti-recirculation system
US11172591B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 11, 2019 |
| Grant date | Nov 9, 2021 |
| Priority date | — |
| Expiry date | Feb 24, 2040 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH05K7/20727
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
A frame having a perimeter defines a planar opening. A set of louvers may span from a first edge of the opening to a second edge of the opening. Each louver may be capable of rotating between a closed position and an open position. A set of physical obstructions may prevent the louvers from rotating beyond the open position. Each louver may be offset from the planar opening by a first acute angle when in a closed position, and by a second, larger, acute angle when in the open position. A flow of air in a first direction through the opening may rotate the set of louvers to the closed position. A flow air in the opposite direction through the opening may rotate the set of louvers to the open position such that the flow of air in the opposite direction moves freely through the opening.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.