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| Number | Title | Issue Date |
| 7429948 | Device and method for calibrating and improving the accuracy of barometric altimeters with GPS-derived altitudes In a combined GPS/altimeter device, the calibration and hence the accuracy of barometric altimeter measurements are enhanced with the aid of derived altitudes from a GPS. The device determines the need for calibration and perform the subsequent computations necessar... | 09/30/2008 |
| 7142152 | Device and method for calibrating and improving the accuracy of barometric altimeters with GPS-derived altitudes A portable, handheld electronic navigation device includes an altimeter and a GPS unit. An internal memory stores cartographic data, for displaying the cartographic data on a display of the navigation device. Accordingly, the device is capable of displaying cartogra... | 11/28/2006 |
| 6761064 | Movement-detecting altimeter To provide a movement-detecting altimeter designed so as to be capable of avoiding excessive accumulation of errors. The movement-detecting altimeter has a movement dependent altitude updating unit which updates an indicated altitude when a moving condition is maint... | 07/13/2004 |
| 6425299 | Relative height gauge A gauge for monitoring the relative height of two points comprises a generally tubular conduit extending from a first end thereof via a first limb thereof to a monitoring position spaced from the first end and via a second limb of the conduit from the mon... | 07/30/2002 |
| 5844150 | Leap frogging hydrostatic altimeter with carry function A hydrostatic measurement module senses elevation relative to a fluid reservoir under a reference pressure. The measurement module further includes a plurality of functions and modes. A zero function sets the display to zero at any selected benchmark elev... | 12/01/1998 |
| 5726365 | Hydrostatic altimeter A hydrostatic measurement module senses elevation relative to a fluid reservoir under a reference pressure. The measurement module further includes a plurality of functions and modes. A zero function sets the display to zero at any selected benchmark elev... | 03/10/1998 |
| 5671162 | Device for recording descent data for skydiving This device can record descent data for successive skydiving jumps with a pressure transducer for providing a pressure signal signifying ambient pressure. The device also has a processor coupled to the pressure transducer for displaying descent data on a ... | 09/23/1997 |
| 5517869 | Hydrostatic altimeter error compensation A device for providing one or more signals that are functions of a sensor module's altitude relative to a reference body of liquid. The sensor module has one or two hydrostatic pressure transducers, which transducers are linked to the bodies of liquid by ... | 05/21/1996 |
| 5307698 | Vertical measurement system The pressure atop a fluid filled flexible column, with the top end in a fixed position, is electronically measured and the result is utilized to indicate the vertical distance between points of interest. Associated electronics plus a suitable display, ind... | 05/03/1994 |
| 5001926 | Device for determining the vertical distance between two elements at unequal heights A device for measuring the pressure difference between the two ends of at least one flexible tube connecting together the positions occupied by two elements. In a preferred embodiment, to a summing circuit are applied the signals delivered by two differen... | 03/26/1991 |
| 4563822 | Level device for masonry work A level device is designed to determine different levelling points in building work to automatically set certain parts, such as the suspension systems for false ceilings when this apparatus is fitted with a bolt-driving attachment, comprising a flexible t... | 01/14/1986 |
| 4452078 | Device for checking the depth reached by a digging operation This invention concerns a device for checking the depth reached by operation of a digging machine including a digging implement (11) arranged on an arm (8) pivotably supported relative to the machine. The device comprises a fluid-filled conduit (13) assoc... | 06/05/1984 |
| 4422244 | Elevation indicator An elevation indicator comprising a supporting base, a reservoir for holding liquid supported on the base, an elongated staff and a flexible tube extending from the staff to the reservoir. An elongated scale is mounted on the staff for longitudinal moveme... | 12/27/1983 |
| 4379367 | Electrically controlled level Apparatus for comparing the level of two spaced points, to find which is higher or lower, and possibly also for determining the magnitude of the difference in level of the points. The apparatus comprises two chambers that communicate with each other throu... | 04/12/1983 |
| 4375765 | Level indicating device A level indicating device comprises a compressible container, which is charged with a measuring liquid, and a flexible transparent tube having a first end immersed in the liquid within the container. The second end of the tube may be affixed to a support ... | 03/08/1983 |
| 4356639 | Compact portable digital multimeter for instantaneous measuring of height differences independently of visibility A device for measuring height despite difficult visibility comprises a small portable water tank positioned at the location to be measured and a pressure transducer placed at a reference location and connected with the water tank by a hose, whereby the tr... | 11/02/1982 |
| 4218919 | Apparatus for measuring elevation Disclosed herein is apparatus for measuring elevation and including an elongated conduit adapted to be filled with liquid and having opposite ends, and a first pressure sensing transducer connected to one end of the conduit for measuring the fluid pressur... | 08/26/1980 |
| 4167876 | Methods and apparatus for determination of terrestrial settlement profiles Method for the determination of settlement in foundation structures for buildings such as dams using a long length of tubing installed within the foundation structure in which mercury and water with a defined interface is forced along the tube from one en... | 09/18/1979 |
| 4026156 | Vertical displacement measuring apparatus Apparatus for measuring the vertical displacement between a remote point and a reference point. The apparatus comprises a pair of reservoirs, each having a liquid working fluid disposed therein, a differential pressure transducer and a hydraulic coupling ... | 05/31/1977 |
| 4003263 | Tube profile gage To measure compressions and settlements in the foundations of heavy structures, a continuous loop of tubing is installed within the foundation of the structure, with the open ends of the loop brought to a convenient, accessible terminal point. A liquid in... | 01/18/1977 |
