Subsurface in-situ radon gas detection/penetrometer system
US5744730A · kind A · utility
Inventors
Key dates
| Filing date | Feb 14, 1997 |
| Grant date | Apr 28, 1998 |
| Priority date | — |
| Expiry date | Feb 14, 2017 |
Classification
- Technology area (CPC E)Fixed Constructions
- CPC primaryE21B33/13
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A penetrometer probe for detecting the presence of subsurface radon gas and obtaining soil classification data is characterized by an elongated body containing recessed inlet and outlet ports, a sampling chamber, a vacuum/air controlled valve system having pistons displaceable between open and closed positions, and a vacuum/air system for drawing gas samples into and expelling gas samples from the sampling chamber. The probe also includes a detachable tip which allows grout to be injected into the borehole as the probe is withdrawn. In an alternate embodiment, the probe includes an outer sleeve for controlling the taking of gas samples in which the sleeve slides upwardly in a groove contained in the probe body during penetration, thereby covering the gas sampling ports, and slides downwardly during retraction, thereby uncovering the soil gas sampling ports and allowing gas to flow to the sampling chamber.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.