| Patents for G01L 13 - Devices or apparatus for measuring differences of two or more fluid pressure values (2,634) |
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| 05/02/1978 | US4086815 Device for use in sensing pressures |
| 03/28/1978 | US4081636 Differential pressure cutout switch |
| 02/14/1978 | US4074224 Acoustic wave transducer with automatic compensation of the static pressure variations |
| 02/14/1978 | US4073191 Differential pressure transducer |
| 02/07/1978 | US4072058 Differential pressure transmitter with pressure sensor protection |
| 02/07/1978 | US4072057 Differential pressure cell with diaphragm tension and overpressure protection |
| 01/10/1978 | US4067241 Improvements in or relating to oscillating crystal transducer systems |
| 11/15/1977 | US4058788 Differential pressure transducer |
| 11/01/1977 | US4056008 Transducing methods and transducers |
| 10/04/1977 | US4051729 Amplifier beam type transducer |
| 09/06/1977 | US4046010 Pressure transducer with welded tantalum diaphragm |
| 07/12/1977 | US4034610 Differential pressure measuring device |
| 06/28/1977 | US4031847 Pressure ratio reversal indicator |
| 06/21/1977 | US4030365 Differential pressure gauge |
| 06/14/1977 | US4029042 Differential pressure indicator device |
| 06/14/1977 | US4028945 Protection system for the overpressures of a silicium wafer sensor used in a differential pressure transmitter |
| 05/31/1977 | US4026153 Magnetic pressure indicator with sampling ports |
| 04/05/1977 | US4015477 Linear displacement transducer |
| 03/29/1977 | US4014284 Differential pressure indicators |
| 03/15/1977 | US4011650 Cold working process |
| 12/28/1976 | US3999435 Differential pressure transmitter |
| 12/07/1976 | US3995493 Differential pressure transducer |
| 09/21/1976 | US3981198 Transducing methods and transducers |
| 09/14/1976 | US3980040 Differential pressure indicator |
| 08/17/1976 | US3974795 Differential pressure indicating device |
| 07/13/1976 | US3968693 Open-loop differential-pressure transmitter |
| 06/29/1976 | US3965746 Pressure transducer |
| 06/15/1976 | US3963891 Choked condition detector for an air-purifying device |
| 05/18/1976 | US3956937 Pressure sensing system |
| 03/23/1976 | US3946176 Differential pressure switch |
| 03/02/1976 | US3941077 Signal device for detecting filter condition |
| 02/24/1976 | US3939712 Pneumatic differential pressure sensor |
| 01/27/1976 | US3934543 Apparatus for monitoring the condition of a filter |
| 01/13/1976 | US3931738 Device for monitoring fluid pressure in mechanisms such as hydrostatic fluid bearings |