Protective drain
US4594739A · kind A · utility
15Cited by
10References
5Claims
0Family size
Inventors
Key dates
| Filing date | May 21, 1984 |
| Grant date | Jun 17, 1986 |
| Priority date | — |
| Expiry date | May 21, 2004 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/788
- WIPO fieldCivil engineering
- WIPO sectorOther fields
Abstract
A floor drain for hazardous environments comprises a grating, a housing, and an elastic one-way valve clamped by a flange between the grating and the housing. The valve has a tubular body with contacting parallel wall portions which open when a liquid enters the valve. The valve closes when there is no pressure at the inlet. The valve closes more tightly in the event of elevated down stream pressure, positively preventing the escape of gas. An existing, unprotected drain can be retrofitted with the one-way valve.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.