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3M employee and church chorister Art Fry needed something to temporarily mark pages in his hymnal. He was in luck because his colleague, Spencer Silver, accidentally developed a glue that was too weak for other purposes. After initially discouraging consumer response, Post-it Notes became a hit in 1979.
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| Number | Title | Issue Date |
| 7719926 | Slotted cylinder acoustic transducer A slotted cylinder acoustic transducer has a crescent-shaped insert disposed between a ceramic stack assembly and s cylindrical housing shell. In some embodiments, all of the ceramic elements in the ceramic stack assembly can have the same shape. ... | 05/18/2010 |
| 7483339 | Acoustic projector and method of manufacture An underwater acoustic projector comprising one or more cylindrical shell segments (8), each shell segment (8) having an even number of drivers (10) mounted therein, and the method of manufacturing said projector. The shell segments (8) p... | 01/27/2009 |
| 7372777 | Sonic instrumentation apparatus and method for cement bond logging A longitudinally segmented acoustic transducer for a cement bond logging (CBL) tool having a plurality of adjoining PZT ring-like segments driven synchronously in parallel by one or more pulses and caused to vibrate in an anti-resonant mode, substantially below the ... | 05/13/2008 |
| 7367239 | Piezocable based sensor for measuring unsteady pressures inside a pipe A piezocable-based sensor for measuring unsteady pressures inside a pipe comprises at least one cable extending around at least a portion of a circumference of the pipe. The cable includes a first electrical conductor, a piezoelectric material disposed around the fi... | 05/06/2008 |
| 7336562 | Sonic logging tool including receiver and spacer structure A formation logging tool having a substantially continuous central mandrel with regularly spaced mass blocks disposed thereon, at least some of the mass blocks carrying sensors such as receivers. By adopting this structure, the tool can be made to behave as a mass-s... | 02/26/2008 |
| 7324406 | Sensor arrangement for seismic waves A sensor arrangement is provided for use in the seismic investigation of geological formations below the seabed. A plurality of sensor nodes (20) are provided and are positioned gfor deployment on the seabed to collect pressure waves and shear waves from the ... | 01/29/2008 |
| 7322251 | Method and apparatus for measuring a parameter of a high temperature fluid flowing within a pipe using an array of piezoelectric based flow sensors A method, apparatus and system are provided to measure the process flow of a fluid or medium traveling in a pipe. The system and apparatus feature a standoff and piezoelectric-based sensor arrangement having a plurality of standoffs arranged on a pipe and a pluralit... | 01/29/2008 |
| 7308820 | Piezocable based sensor for measuring unsteady pressures inside a pipe A piezocable based sensor for measuring unsteady pressures inside a pipe comprises a cable wrapped around the pipe and an outer band compressing the cable towards the pipe. The cable provides a signal indicative of unsteady pressure within the pipe in response to ex... | 12/18/2007 |
| 7239577 | Apparatus and methods for multicomponent marine geophysical data gathering In one embodiment the invention comprises a particle velocity sensor that includes a housing with a geophone mounted in the housing. A fluid that substantially surrounds the geophone is included within the housing. The particle velocity sensor has an acoustic impeda... | 07/03/2007 |
| 7209288 | Snorkel device for a submarine An optical observation device is connected to an extendable and retractable snorkel tube for above-water observation during the snorkel travel (travel at periscope depth) of the submarine. The optical observation device is designed as a compact unit which consists o... | 04/24/2007 |
| 7195069 | Method and apparatus for backing off a tubular member from a wellbore A back-off tool for use in a tubular member disposed inside a wellbore. The back-off tool includes a housing and at least one sonic wave generator mounted within the housing. The sonic wave generator is configured to generate a plurality of sonic waves. ... | 03/27/2007 |
| 7146864 | Apparatus having a multi-band sensor assembly for measuring a parameter of a fluid flow flowing within a pipe An apparatus measures the speed of sound and/or vortical disturbances propagating in a fluid flow to determine a parameter of the flow propagating through a pipe. The apparatus includes a sensing device that includes an array of pressure sensors used to measure the ... | 12/12/2006 |
| 7120087 | Electronics-carrying module An electronic-carrying module (640), for example for use with a seismic data acquisition cable (400), is disclosed. The preferred electronic-carrying module (640) includes, first, an electronics carrier (106) having access means (107 | 10/10/2006 |
| 7093343 | Method of manufacturing an acoustic transducer An acoustic transducer design having a slotted oval-shaped shell and active transducer elements located on the inner surface of the shell is disclosed. The design provides a high power, ultra-low frequency oval projector having a number of applications, including un... | 08/22/2006 |
| 7069795 | Sensor using electro active curved helix and double helix Various sensors use an electro-active device (11) electrically connected to a detector circuit. The electro-active device (11) comprises an electro-active structure in the form of a continuous electro-active member (12) curving in a helix around... | 07/04/2006 |
| 7032707 | Acoustic isolator downhole applications A plurality of heavy mass irregularities attached to an inner wall of the drill collar attenuate waves traveling through the collar. The plurality of heavy mass irregularities are spaced and sized for the maximum attenuation of acoustic pulses in a predetermined fre... | 04/25/2006 |
| 7028549 | High-pressure sensor, method and tool for its manufacture A high-pressure sensor includes a deformation member and connection piece that is joined to the deformation member by a welded seal. The deformation member has a truncated-cone-shaped circumferential segment, via which a welding current can be supplied, in order to ... | 04/18/2006 |
| 6998999 | Hybrid piezoelectric and magnetostrictive actuator An electromechanical transducer formed by an electrical and mechanical combination of a piezoelectric device and a magnetostrictive device. The two devices are electrically coupled so that their capacitive and inductive reactances approach a balance to provide an es... | 02/14/2006 |
| 6973972 | Method for reduction of scale during oil and gas production and apparatus for practicing same Scaling may be reduced during oil and gas production using a device having a sound transducer. The device can be used downhole and functions independently of an external power supply. Use of the device allows for the reduction or elimination of anti-scaling chemical... | 12/13/2005 |
| 6951138 | Method and apparatus for an ocean bottom seismic acquisition technique A seismometer having a hydrodynamically efficient shaped body containing a seismic sensor or source, having a propulsion unit located and a control unit for directional control of the propulsion unit for guiding the seismometer to and from an ocean floor. The seismo... | 10/04/2005 |
| 6950566 | Method and apparatus for an acousto-optic filter that generates a helical wave and method for manufacturing same A method to reduce optical intensity modulation is described that involves generating a spiraling wave onto an acoustic-optic interaction portion of an optical fiber within an acousto-optic filter in order to create reflected waves that are orthogonal with respect t... | 09/27/2005 |
| 6925869 | Ultrasonic fuel-gauging system The invention provides a fuel-tank system with an ultrasonic fuel-gauging system for an aircraft. The fuel-tank system includes a fuel tank, a transducer carrier tape covered with a separation barrier, and coupled to a surface of the fuel tank, and at least one ultr... | 08/09/2005 |
| 6915875 | Acoustic isolator for downhole applications A plurality of heavy mass irregularities attached to an inner wall of the drill collar attenuate waves traveling through the collar. The plurality of heavy mass irregularities are spaced and sized for the maximum attenuation of acoustic pulses in a predetermined fre... | 07/12/2005 |
| 6873572 | Low-frequency sonar countermeasure A multi-port projector of acoustic energy in water includes a cylindrical hollow transducer having open annular ends. A thin, flexible member is secured to each annular end to extend across each opening to be displaced by the transducer, and the transducer and flexi... | 03/29/2005 |
| 6739423 | Acoustic logging tool A sleeve for an acoustic logging tool has a structure with a window section having fewer bars than a conventional sleeve separated by a slotted region with thin circumferential slots which are stress-relieved at the ends (“dumb-bell” shaped). Steel receiver moun... | 05/25/2004 |
| 6552961 | Seismic source sensor A system for detecting source acoustic energy in seismic operations. The system is operable on land and in marine applications. On land, a piezoelectric film is positioned between a vibrator or other source baseplate and the soil. Compression of the piezo... | 04/22/2003 |
| 6512980 | Noise reference sensor for use in a dual sensor towed streamer A method of marine seismic surveying, whereby a seismic streamer is towed in a body of water while deploying three (3) sensors in close proximity to each other. In one embodiment of the invention, the first sensor generates a first signal indicative of pr... | 01/28/2003 |
| 6337835 | Electromechanical converter and method of producing same The present invention relates to an electromechanical converter, a method of manufacturing same, as well as to a composite system including the electromechanical converter. The inventive electromechanical converter consists of at least one elongate fiber ... | 01/08/2002 |
| 6285631 | Slotted cylinder transducer with sealing boot and method of making same A sealed slotted cylinder includes an active transducer assembly, end caps at each end of the assembly, and a boot fused to the end caps and sealing the assembly. The sealed slotted cylinder is made using a dummy insert and a spacer within the dummy inser... | 09/04/2001 |
| 6278658 | Self biased transducer assembly and high voltage drive circuit An improved transducer arrangement for low frequency sonar projectors that convert electric signals to mechanically generated acoustic signals. In one embodiment the arrangement has both a convex flextensional transducer and a concave flextensional transd... | 08/21/2001 |
| 6109109 | High energy, low frequency, ultrasonic transducer A wide bandwidth, ultrasonic transducer to generate nondispersive, extensional, pulsed acoustic pressure waves into concrete reinforced rods and tendons. The wave propagation distance is limited to double the length of the rod. The transducer acoustic imp... | 08/29/2000 |
| 6076629 | Low frequency flextensional acoustic source for underwater use There is provided an acoustic source especially for use in seismic studies at sea. The acoustic source has a longitudinal axis and sound emitting surfaces adapted to be put into sound emitting movements towards and away from each other by use of a drive u... | 06/20/2000 |
| 6069845 | Composite marine seismic source A marine seismic source for generating acoustic source energy from electrical power. A slotted housing has an exterior surface engaged with an electrically activated transducer such as a piezoelectric transducer. One or more piezoelectric components can b... | 05/30/2000 |
| 6041888 | Low frequency flextensional acoustic source for underwater use Acoustic source, especially for use in seismic studies at sea, with sound emitting surfaces adapted to be put into sound emitting movements toward and away from each other by use of a drive unit in a known manner, in which the sound emitting surfaces comp... | 03/28/2000 |
| 6002648 | Slotted cylinder marine siesmic method and source A seismic method and system for generating seismic source energy in marine geophysical operations. A slotted housing is moveable by the actuation of piezoelectric elements to generate high power, low frequency seismic source signals. When the piezoelectri... | 12/14/1999 |
| 5796676 | Hydrophone module for a marine seismic cable A low-profile hydrophone module for a marine seismic system includes a block having a curved surface and a receiving surface in which an open cavity is disposed, a hydrophone assembly, to which lead wires attach, disposed in the cavity, lead wires which p... | 08/18/1998 |
| 5784341 | Underwater acoustic transmitter for large submersion The invention relates to underwater acoustic transmitters intended to be submerged at large depths. It consists in threading the set of annuli forming the transmitter onto an internal tube (303) preferably made from a carbon/resin composite, which support... | 07/21/1998 |
| 5781509 | Wide beam array with sharp cutoff A transducer array is constructed from a constant arc length portion of a ght circular cylindrical shell of piezoelectric transduction material. The constant arc length portion is segmented evenly along the length thereof to define a plurality of transduc... | 07/14/1998 |
| 5742559 | Hydrophone and array thereof A piezoelectric transducer hydrophone comprised of a plurality of longitudinal segments is described. The longitudinal segments allow the transducers to be readily attached to cables to form hydrophone arrays. Should a particular transducer become faulty ... | 04/21/1998 |
| 5726952 | Sound or ultrasound sensor A sound or ultrasound sensor is provided for transmitting and/or receiving sound or ultrasound, which is mechanically robust and chemically resistant and which has an adjustable emission characteristic, for example having a preferably small beam angle, ha... | 03/10/1998 |
