| Patents for G01C 5 - Measuring height; Measuring distances transverse to line of sight; Levelling between separated points; Surveyors' levels (3,586) |
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| 05/03/1994 | US5307698 Vertical measurement system |
| 04/21/1994 | DE4326706A1 Measuring relative and absolute vertical height - using hydrostatic sensors and extended line filled with liq. and distributed pressure sensors |
| 04/19/1994 | US5303587 Diver's depth gauge |
| 03/17/1994 | WO1994005971A1 Hydrostatic levelling |
| 03/17/1994 | WO1994005970A1 Spatial positioning system |
| 03/17/1994 | CA2143838A1 Spatial positioning systems |
| 03/15/1994 | US5295085 Pressure measurement device with selective pressure threshold crossings accumulator |
| 02/09/1994 | CN2155551Y High-brightness surveyors' level |
| 02/01/1994 | US5283574 Altitude loss after take-off warning system utilizing time and altitude |
| 01/05/1994 | CN2152201Y 多用测量镜头 Multi-shot measurement |
| 12/28/1993 | US5272814 Device for defining a horizontal plane |
| 11/25/1993 | DE4317106A1 Laser surveying appts. for height measurement - has laser projector beam deflection angle and rate detection and controls deflection motor operation accordingly |
| 11/18/1993 | DE4216327A1 Electronic spirit level - has tube contg. coloured liq. and optical fibre and has infrared light valves coupled to sound source which emits warning pulses at first rate when liq. reaches first light valve and at higher rate when second light valve is reached. |
| 11/09/1993 | US5260702 Aircraft information system |
| 10/29/1993 | CA2094183A1 Atmospheric pressure calibration systems and methods |
| 10/28/1993 | DE4213090A1 Electronic hose levelling instrument for calibrating horizontal surfaces - contains 3 sensors in arm of hose, one permanently coupled to liq., second as level sensor and third for sensing excess and coupled via resistors to pulsed sound source. |
| 10/25/1993 | CA2094627A1 Aircraft piloting method for crash avoidance |
| 10/06/1993 | EP0564218A1 Strut height adjusting apparatus |
| 09/22/1993 | EP0561318A1 Foundation and manufacturing method therefor, and method and apparatus for measuring vertical sinkage of foundation |
| 09/02/1993 | WO1993017300A1 Pressure measurement device with selective pressure threshold crossings accumulator |
| 08/26/1993 | DE4205637A1 Hand-held optical height meter for terrain height difference and building height measurement - has tube level and mirror mounted in block, enabling viewing in horizontal and rotated positions |
| 08/04/1993 | EP0553871A2 Level position measuring method, level marking method and level marking apparatus comprising hose |
| 08/04/1993 | EP0543954A4 Spatial positioning system |
| 07/20/1993 | US5229829 Height sensor and air cushion |
| 06/29/1993 | US5224059 Device for measuring altitude and barometric pressure |
| 06/29/1993 | CA1319506C Vertical displacement measuring device |
| 06/15/1993 | US5220322 Ground proximity warning system for use with aircraft having egraded performance |
| 06/02/1993 | EP0543954A1 Spatial positioning system. |
| 05/26/1993 | CN2134638Y 高差检测仪 Height detector |
| 05/13/1993 | WO1993009399A1 Surveying system using radio ranging and barometric height |
| 05/13/1993 | DE4236357A1 Barometric altimeter incorporating piezo-resistive pressure gauge and memory - indicates absolute altitude and rate of loss or gain by comparison of reading with stored data |
| 05/05/1993 | EP0539715A1 Method and device for hydrostatic levelling |
| 05/05/1993 | CN2132156Y Kettle type duct levelling instrument |
| 04/29/1993 | DE4135407A1 Measuring and adjusting row of underwater fixtures e.g. for mounting antenna - connecting sections of piping, transmitting light beam along pipe axis and adjusting fixtures w.r.t. beam position |
| 04/14/1993 | CN2129919Y Communicating vessels levelling instrument |
| 03/23/1993 | US5196693 Method and apparatus of photodetection with maximum signal holding means |
| 03/09/1993 | US5191792 Instrument for indicating altitude or direction |
| 02/23/1993 | US5189646 Small-sized electronic device with depth gauge |
| 02/16/1993 | US5187478 Configuration responsive descent rate warning system for aircraft |
| 02/16/1993 | US5186579 Apparatus for controlling direction of underground excavator |
| 12/23/1992 | EP0214272B1 Altitude loss after take-off warning system utilizing time and altitude |
| 12/16/1992 | CN2125124U Connected type plane surveying instrument |
| 12/10/1992 | WO1992021936A1 Attitude sensor |
| 11/24/1992 | US5166878 Method and apparatus of computer aided surveying for obtaining digital, 3d topographic information |
| 11/24/1992 | US5166682 Ground proximity warning instrument utilizing glideslope modulation of excessive descent rate envelope |
| 11/17/1992 | US5164708 Single unit, multi signal, variable plane measuring and leveling device |
| 11/12/1992 | DE4212718A1 Hose-type balance for one-man operation - has transparent PVC water tank height-adjustable on wall mounting, useful for levelling foundations and masonry, etc. |
| 10/21/1992 | CN2119639U Overflow type communicating tube tiltometer |
| 10/07/1992 | CN2118291U Interconnected type plane measurer |
| 10/06/1992 | US5153588 Warning system having low intensity wind shear enhancements |
| 09/17/1992 | WO1992015976A1 Improved ground proximity warning instrument utilizing glideslope modulation of excessive descent rate envelope |
| 09/17/1992 | WO1992015975A1 Instrument to monitor unsafe flight paths when automated guidance system is in use |
| 08/19/1992 | CN1063758A Miniature projective measuring instrument |
| 08/13/1992 | DE4103461A1 Submersible computer integrated in housing - has electronic evaluation circuit and LCD indicator arranged sealed against humidity behind transparent window of housing |
| 08/12/1992 | EP0215115B1 Aircraft terrain warning system with configuration modified warning and improved mode switching |
| 08/04/1992 | US5136512 Ground collision avoidance system |
| 07/21/1992 | US5131156 Leveling apparatus and method |
| 07/08/1992 | CN2109547U Acousto-optic liquid plane measuring device |
| 06/24/1992 | EP0217852B1 Aircraft terrain closure warning system with descent rate based envelope modification |
| 06/17/1992 | CN2107639U Digital connecting tube level-meter |
| 06/03/1992 | CN2106354U Level testing device |
| 06/03/1992 | CN2106353U Simple level measuring device |
| 05/12/1992 | US5111588 Level vial |
| 05/05/1992 | US5111188 Electronic fluid-level sensor with three state indicator |
| 04/28/1992 | US5108177 Two-axis levelling instrument with a single pendulum for projecting a level laser beam |
| 04/16/1992 | WO1992006356A1 Accumulating altimeter with ascent/descent accumulation thresholds |
| 04/14/1992 | US5103685 Wrist-worm rate of ascent/descent indicator |
| 04/08/1992 | EP0478798A1 System for controlling direction of underground excavator |
| 04/07/1992 | US5101571 Hydrostatic plumber's level |
| 04/01/1992 | CN2100602U Mine level bar |
| 03/11/1992 | CN1015824B Stabilization control circuit for vertical position in inertial navigator equipment |
| 02/25/1992 | US5090128 Device for measuring or controlling change of level between several points |
| 02/18/1992 | WO1992003701A1 Spatial positioning system |
| 02/18/1992 | US5089674 Hydrostatic pressure sensor |
| 02/11/1992 | US5087125 Equipment for measuring a difference in elevation |
| 01/15/1992 | EP0466635A1 Measuring instrument |
| 01/08/1992 | CN2092744U Positioning water gauge |
| 01/01/1992 | CN2092088U Simple height measurer |
| 01/01/1992 | CN2092087U Level-meter |
| 01/01/1992 | CN2092086U Axis measurer for building construction |
| 12/24/1991 | US5075685 Warning system for tactical aircraft |
| 12/24/1991 | US5074049 Contain water |
| 12/04/1991 | CN2090044U Light and reflection ruler |
| 11/27/1991 | CN2089615U Line and pen levelling instrument |
| 11/21/1991 | EP0214273B1 Configuration responsive descent rate warning system for aircraft |
| 11/19/1991 | CA1292118C Self leveling transmitter for laser alignment systems |
| 11/06/1991 | CN1014633B Engineering measuement method and device for inclined surface |
| 10/31/1991 | WO1991016525A1 System for controlling direction of underground excavator |
| 10/31/1991 | WO1991016233A1 Hydrostatic pressure sensor |
| 10/30/1991 | EP0172221B1 Terrain advisory system |
| 10/30/1991 | CN2087770U Engineering construction integrated detector |
| 10/23/1991 | EP0452975A2 A receiver for a laser alignment system with modulated field |
| 10/23/1991 | EP0452974A2 Laser alignement system with modulated field |
| 10/22/1991 | US5058427 Accumulating altimeter with ascent/descent accumulation thresholds |
| 10/02/1991 | CN2085951U Direct reading type level-ruler |
| 09/17/1991 | US5048337 Hypsometer having controlled heating, particularly for use in metrological radio-sondes |
| 09/11/1991 | EP0445480A2 Device for measuring or monitoring differences in level between several points |
| 09/10/1991 | CA1288865C Stabilization control circuit for vertical position in an inertial navigator |
| 08/14/1991 | EP0440956A2 Method and apparatus of photodetection |
| 08/06/1991 | US5038141 Configuration responsive descent rate warning system for aircraft |