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| Number | Title | Issue Date |
| 6796550 | Humidifier filter servicing and water level indicator A humidifier includes a housing, a fan assembly, a wick assembly, a first humidity sensor, a second humidity sensor, and a controller. The housing has an air inlet, an air outlet, and a reservoir for holding water. The fan assembly creates an airflow through the hou... | 09/28/2004 |
| 4763522 | Radiation detector psychrometer A hand held testing surface and scale card may be used in conjunction with a radiation detector to obtain an indication of relative humidity. The scale card is provided with two sections. One section is of absorbent relatively thin material; the second se... | 08/16/1988 |
| 4269060 | Continuous recording of vapor pressure Apparatuses and methods for continuously recording the relative humidity and/or the vapor pressure of a gaseous component of a material within a gaseous mixture utilizing a relative humidity sensor having a curvature changeable with respect to changes in ... | 05/26/1981 |
