Underground tank fill pipe combination
US4327769A · kind A · utility
0Cited by
3References
1Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 6, 1980 |
| Grant date | May 4, 1982 |
| Priority date | — |
| Expiry date | Feb 6, 2000 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T137/86324
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A combination of elements for use with an underground tank that has a fill tube which is below ground level and subject to rainwater immersion. It has special application to a fill tube closure that has a small diameter passageway to maintain atmospheric pressure in the fill tube. It includes a float valve to close the passageway if the rainwater rises above a given level adjacent to the top of the fill tube.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.