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| Number | Title | Issue Date |
| 4897597 | Apparatus and methods for detecting wet and icy conditions Apparatus that detects the presence and condition of precipitation on the surface of a pathway. The apparatus has a block of electrically insulative material adapted to be embedded in the pathway with a top surface exposed to precipitation. A sensor is em... | 01/30/1990 |
| 4750117 | Ultrasonic depth measurement apparatus and methods Apparatus for determining or measuring the depth of precipitation accumulating on the surface of a pathway, such as an airport runway or the like. The apparatus includes a sensor having electrical transducer means for emitting and sensing ultrasonic energ... | 06/07/1988 |
| 4679160 | Ultrasonic depth measurement apparatus and methods Apparatus for determining the depth of precipitation accumulating on the surface of a pathway, such as an airport runway or the like, includes a sensor having electrical transducer means for emitting and sensing ultrasonic energy and having a body of mate... | 07/07/1987 |
| 4281286 | Apparatus and method for detecting wet and icy conditions on the surface of a pathway Detection of wet and icy surface conditions on the surface of a pathway is accomplished using a block of electrically insulative material embedded in the pathway with its top surface flush with the surface of the pathway and exposed to atmospheric precipi... | 07/28/1981 |
| 4135151 | Apparatus for detecting wet and icy surface conditions Apparatus for detecting wet and icy conditions on the surface of a pathway. A block of electrically insulative material is embedded in a pathway with the top surface of the block being substantially flush with the surface of the pathway and exposed to atm... | 01/16/1979 |
| 3986110 | Water depth measuring device A device for use in determining the depth of water accumulating on the surface of a pathway, such as an airport runway or the like. A block of electrically insulative material is embedded in a pathway with the top surface of the block being substantially ... | 10/12/1976 |
