Famous Patents
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 |
| 7370429 | Integrated electronic level device A device adapted to be integrated with a wall hanging for indicating an off-level condition is provided. The device includes a series electrical circuit including a power supply and a signal element connected with the power supply, wherein the signal element is capa... | 05/13/2008 |
| 7360424 | Capacitance-type liquid sensor A capacitance type liquid sensor is disclosed which detects a tilt angle and acceleration of an object using the fact that a liquid surface always keeps itself horizontal. Openings (13, 14) are formed in two sides of a hollow cylindrical closed container (... | 04/22/2008 |
| 7222433 | Electromagnetic inclinometer An angle sensor comprising a housing (1) having horizontal and vertical axes, which housing is adapted to receive a magnetic core (5) such that the core remains in substantially the same plane, e.g. by floating on a liquid (4). The core is provi... | 05/29/2007 |
| 7100294 | Method of sensing tilt, tilt sensor, and method of manufacturing same A method of sensing tilt includes applying an electrical signal, such as voltage, current, a constant signal, or a time-varying signal to at least one electrode of a first set of electrodes and measuring an electrical parameter using at least one electrode of a seco... | 09/05/2006 |
| 7055254 | Tiltsensor An adjustment-free tiltsensor for application in the fields of geodesy, geophysics and geotechnics, with a tilt angle measuring range greater than ±5° to ±10° and an essentially enhanced angular resolution better than 1 microradiant, in which an electrolytic liq... | 06/06/2006 |
| 7009310 | Autonomous power source An autonomous power source comprises a power harvester mounted on a movable structure. The power harvester includes a coil, a magnet, and a low-friction ferrofluidic bearing in contact with the magnet, arranged such that the magnet and coil move with respect to each... | 03/07/2006 |
| 6516527 | Inclinometer A digital inclinometer detects an inclination angle by sensing varying conductive current of various electrodes. When the inclinometer is rotated through an inclination angle, various segments of the sensing electrodes become immersed in a conductive flui... | 02/11/2003 |
| 6301795 | Tilt sensor using magnet and magnetic sensor A tilt sensor capable of sensing tilt in two axes includes an outer shell, a magnet at a fixed position inside the shell, and a reference element movable within the shell in response to gravity. Magnetic flux follows a plurality of paths from a pole of th... | 10/16/2001 |
| 6123866 | Electrolytic solution for clinometric sensor A pair of upper electrodes are formed on an upper inner surface of a closed container constituting a clinometric sensor and a lower electrode is formed on the bottom of the closed container. An electrolytic solution comprising potassium iodide and a solve... | 09/26/2000 |
| 5802728 | Liquid level and angle detector A feedback circuit for generating an output signal from a sensor that makes changing electrical and temperature characteristics of the sensor and any sensing medium irrelevant. The sensor is placed in the forward loop of the circuit to make the output dep... | 09/08/1998 |
| 5456013 | Inductive tilt sensor and method for measuring tooth mobility A sensor for measuring angular displacement of a small body comprising a sealed housing containing a differential transformer having at least two primary coils, one primary and two secondary coils, or two primary and two secondary coils, said coils being ... | 10/10/1995 |
| 5452519 | Attitude sensor An attitude sensor comprises a spherical ball suspended in a fluid contained in a housing. The ball is maintained neutrally buoyant with respect to the fluid and out of direct contact with the housing. A means is provided for detecting the orientation of ... | 09/26/1995 |
| 5452520 | Ferrofluid inclinometer An inclinometer device containing a magnet surrounded at each pole by a thin, discrete band of ferrofluid; these bands are retained against the magnet by its own magnetic field, and suffice to suspend the magnet within a nonmagnetic housing that may be op... | 09/26/1995 |
| 5385110 | Boat trim control and monitor system A boat trim control system that includes a boat having a bull and means such as trim tabs mounted to the hull for trimming attitude of the boat as the bull is propelled through the water. The system includes facility for selectively adjusting the trim tab... | 01/31/1995 |
| 5205042 | Process for adjusting the verticality of an article disposed in a closed envelope and assembly for carrying this process The article of which the verticality is critical, for example a distillation column disposed in a closed envelope, is associated with an indicator of verticality comprising a suspended mass and a locating ring. The envelope, which contains the various inn... | 04/27/1993 |
| 5042158 | Inclination sensor An inclination sensor, in particular for measuring an inclination of service lines and/or ram boring machines, comprising a pendulum arranged in a measuring cell and at least one displacement sensor measuring the deflection of the pendulum. The pendulum c... | 08/27/1991 |
| 4932132 | Electronic level apparatus and method This invention relates to an electronic level apparatus wherein a hollow torus is rotatably mounted in the level. A body of ferromagnetic fluid creates a horizontal reference and is sensed to provide an audible signal when a predetermined angular orientat... | 06/12/1990 |
| 4157619 | Inclination and direction responsive apparatus An inclination responsive device including a coil energized to produce a magnetic field extending along a normally vertical axis of the device, and a flux gate assembly adapted to respond to a horizontal component of that field upon tilting movement of th... | 06/12/1979 |
| 3984918 | Inclinometer Disclosed is an inclinometer particularly adapted for use as a top-hole indicator in drilling operations. The inclinometer employs a ferrofluid in a closed tube; the fluid serves as an angle-sensitive movable core of a differential transformer. The second... | 10/12/1976 |
