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| Number | Title | Issue Date |
| 6082174 | Apparatus and method for determining the amount of entrapped gas in a material An entrapped gas measuring apparatus includes a reservoir housing with a reservoir which is adapted to receive a material sample and to expand according to an expansion of the material sample when a negative pressure is applied externally to the reservoir... | 07/04/2000 |
| 5650562 | Cement treated with high-pressure CO2 Cured cement matrices are exposed to dense-phase or supercritical CO2 which enters the matrix through passages therein to neutralize the natural alkalinity of the cement so that alkali-intolerant materials can be incorporated in the cement. The... | 07/22/1997 |
| 5625138 | Earthquake early warning system An early warning system for providing notice that seismic activity, such as an earthquake, is imminent. The earthquake early warning system includes a subterranean detector unit assembly having a plurality of detector units carried by a subterranean inver... | 04/29/1997 |
| 4967588 | Method of determining the air bubble size distribution in fresh concrete, an analytical assembly and a sample taking device for use herewith A method for determining the air bubble size distribution in fresh concrete, the air bubble distribution in fresh, or green, concrete being identical to the composition in hardened concrete, and an air bubble system consisting of finely divided bubbles be... | 11/06/1990 |
| 4866977 | Mini air meter for fresh concrete A volumetric test apparatus for entrained air contents of regular and lightweight fresh concrete comprises an outer container, an inner bowl, an upper tapered top section detachably securable to the outer container and a cover and rod for the top section.... | 09/19/1989 |
| 4344316 | Method and apparatus for indicating the air content of concrete in situ The apparatus comprises a chamber having an open end and an opposite closeable end, and provided with a heating device and pressure measuring device. The open end of the chamber is inserted into the fresh concrete with opposite end opened. After insertion... | 08/17/1982 |
| 4139814 | Method of detecting corrosion at interface of concrete and reinforcing steel using a hydrogen probe imbedded in the concrete Corrosion at the interface of concrete and reinforcing steel in a concrete structure is determined by placing a hollow hydrogen-permeable probe in the concrete, connecting a getter-ion pump to the probe, and monitoring the output current of the getter-ion... | 02/13/1979 |
