Quotables
"The Americans have need of the telephone, but we do not. We have plenty of messenger boys."
Sir William Preece, chief engineer, British Post Office ; 1878
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 6606279 | Submergence detection for electro acoustic transducers A method of detecting actual or incipient submersion of an electroacoustic transducer (2) facing downwardly toward a surface of fluent material to be sensed in a pulse-echo acoustic ranging system, the transducer having a skirt (6) surrounding a downwardl... | 08/12/2003 |
| 6203280 | Pump totalizer system A method for totalizing the volume of liquid pumped to or from a vessel by a set of pumps. The method comprises the following steps: Calculating a running time for each of the pumps. Determining a first rate of change of volume when each of the pumps is t... | 03/20/2001 |
| 6169706 | Echo detection in pulse-echo ranging systems A method for processing an echo amplitude profile generated by an echo ranging system with reference to a temporal axis to identify return echoes comprised by the profile by identifying amplitude peaks in the profile above with respect to an amplitude axi... | 01/02/2001 |
| 6166998 | Moulded transducer An electro-acoustic transducer is manufactured by forming a transducer assembly at least one piezoelectric element, electrodes contacting the element, and acoustic loading blocks, and applying successive superposed mouldings of material of differing acous... | 12/26/2000 |
| 6112254 | Method of detecting characteristics of liquids in pipes and pump controlling In order to determine the nature of fluid passing through a pipe, for example whether material being pumped through a pipe is sludge or liquid phase, high frequency ultrasonic pulses from a generator are caused to propagate around a peripheral wall of the... | 08/29/2000 |
| 6051895 | Electronic switch relay An electronic relay for use with an ultrasonic transducer. The electronic relay selectively couples the ultrasonic transducer to an electronic circuit. The transducer includes an input/output port for receiving excitation signals from the circuit and for ... | 04/18/2000 |
| 5943294 | Level detector for fluent material A vibrating probe for detecting a threshold level within a vessel of fluent material, particularly a liquid, includes: an ultrasonic acoustic transducer assembly comprising a transducer element having a natural resonant frequency, and loading elements eff... | 08/24/1999 |
| 5748562 | Level detector for solids A vibrating probe for detecting a threshold level of solids within a vessel consists of an ultrasonic acoustic transducer assembly having a resonant frequency, the assembly being supported within the vessel and including a coupling member to couple the tr... | 05/05/1998 |
| 5591010 | Time shift control of wastewater pumping system Reservoir flow or surge control systems frequently have large installed lifting or pumping capacity to deal with variations in either inflow or outflow, or both, and may form a part of a larger system of many such reservoirs. Taken together these reservoi... | 01/07/1997 |
| 5578994 | Liquid level switch A piezoelectric liquid level switch is provided which can be made immune to standing wave effects and provides an unequivocal response to liquid contact. The switch incorporates an electrical oscillator circuit including frequency defining elements in bot... | 11/26/1996 |
| 5519527 | Modem for communicating with enclosed electronic equipment A portable interface unit incorporates a modem for connecting a personal computer through a bidirectional communication link to enclosed process control equipment by passing radiation, preferably infra-red radiation, through a casing enclosing the unit. T... | 05/21/1996 |
| 5416723 | Loop powered process control transmitter A loop-powered intelligent transmitter for process control variables is provided which can operate at an average current in excess of the minimum value of current that can flow in the loop. In order to keep the average current drawn down to the actual loo... | 05/16/1995 |
| 5347495 | Matching transformer for ultrasonic transducer A transformer used to connect an electro-acoustic transducer to a transmitter and a receiver in a pulse-echo ranging system has a first winding connected to the transducer, and second and third windings connected in parallel to the transmitter and the rec... | 09/13/1994 |
| 5339292 | Acoustic transducer A piezoelectric acoustic transducer for coupling acoustic energy to a gaseous atmosphere in a pulse-echo ranging system has a tubular housing closed at one end by a thin integral wall to which a radiating plate of a transducer assembly is coupled to radia... | 08/16/1994 |
| 5267219 | Acoustic range-finding system In an acoustic pulse-echo ranging system, a high impedance piezoelectric transducer element is connected via a transformer to a transmitter, and also directly to a high impedance input of a receiver through a network, in parallel with the transducer eleme... | 11/30/1993 |
| 5260910 | High resolution acoustic pulse-echo ranging system The uncertainty inherent in high-resolution acoustic pulse-echo distance measuring systems which depend on threshold detection is overcome by transmitting a multi-cycle shot of acoustic energy having a sharply peaked amplitude profile, and locating the pe... | 11/09/1993 |
| 5218575 | Acoustic transducer A flexural mode acoustic transducer system for use in pulse-echo ranging systems has a radiating plate of which even-numbered antinodal zones, counting from a drive connection to a driving element at the center of the plate, are formed with rings of apert... | 06/08/1993 |
| 4333028 | Damped acoustic transducers with piezoelectric drivers A tuned acoustic directional transducer for transmitting and receiving airborne sound, which provides enhanced efficiency and reduced cost without undue narrowing of bandwidth, makes use of an acoustic transducer element (2) coupled to a plate (10) having... | 06/01/1982 |
| 4157661 | Flowmeters An inclined plate type flowmeter measures the horizontal reaction resulting from solids striking the plate by using strain gauges to detect deflection of a beam supporting the plate. The difference of the outputs of two such flowmeters at the top and bott... | 06/12/1979 |
