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| Number | Title | Issue Date |
| 4503445 | Printing system Pressure transients are used to produce motion for high speed printing of DOTS; in a first embodiment each printing element in an array of printing elements has the form of an angled rigid tube sealed at the ends; one end is fixed, the other end is free t... | 03/05/1985 |
| 4425796 | Hermetically sealed tank gauge apparatus A hermetically sealed tank gauge apparatus which continuously monitors the fluid level in a closed crude oil tank. A sensor device measures the liquid level in the tank. The sensor device communicates with the interior of the tank, and is isolated from am... | 01/17/1984 |
| 4296758 | Spirometers A spirometer having an inflatable bellows 2, is provided with a movable member 15 which runs along a track 16. By adjusting parts 17, the configuration of the track is set locally to give a variable resistance to movement of member 15 and, consequently, i... | 10/27/1981 |
| 4270381 | Recording instrument to measure microbal gas production An instrument to accept multiple microbal samples and measure the gaseous products produced thereby as a function of time. Each sample module provides a closed reactional vessel communicating to a liquid reservoir from which displaced liquid passes to a v... | 06/02/1981 |
| 4200876 | Water level recorder A water level recorder for use with pressure-sensitive chart paper and having a framework with a lead screw rotatably mounted in the framework. A pulley is secured to the lead screw. The pulley is driven by a tape which is positioned by a float that is ad... | 04/29/1980 |
| 4112761 | Liquid level measuring apparatus This invention relates to an apparatus for measuring and recording the changes in magnitude of a variable. The apparatus includes a recording stylus or pencil and a means for carrying a recording medium such as marking paper. The stylus or the means for c... | 09/12/1978 |
| 4040064 | Fluid pressure actuated recorder A signal actuated recorder device has a recording drum connected to be actuated only when sensing a signal. The recorder is connected to measure the torque employed to make up joints of tubular goods into a string, for example, and can also be used in oth... | 08/02/1977 |
| 4036055 | Liquid level measuring apparatus This invention relates to a liquid level measuring and recording apparatus which includes a recording stylus or pencil and a means for retaining a record such as marking paper. The stylus is connected to a float means which follows the level of the liquid... | 07/19/1977 |
| 3985124 | Spirometer A spirometer for measurement of both the rate and volume of expiratory breathing, and creating a graphic record of the same. In a preferred embodiment, the spirometer incorporates an expansible chamber of the piston type, fitted with a molded rolling rubb... | 10/12/1976 |
| 3973265 | Temperature recording instrument The temperature Recording instrument contains the usual thermal measuring system consisting of a bellows assembly, a temperature sensitive bulb and capillary tubing between the bellows and bulb and a recording system including a marking element which is r... | 08/03/1976 |
| 3945017 | Automatic thermograph An automatic thermograph comprising a means for sensing a variation of temperature by use of a gas and a gas absorbing substance container therein; a recording section including a means for coverting said variation of temperature into a variation of press... | 03/16/1976 |
