Did You Know...
...that Thomas Edison's patent application on his phonograph was approved by the Patent Office in just seven weeks? In contrast, it took Gordon Gould, the inventor of the laser, 30 years to obtain his patent -- finally awarded in 1988!
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| Number | Title | Issue Date |
| 8061050 | Hydrostatic sensor device and method for measuring below-ground elevation changes in grade A hydrostatic sensor device and method is provided for detecting changes in elevation in pipes, boreholes, and tunnels below ground. A pressure transducer for sensing differential changes in fluid pressure is provided at one end of an extensible hose or other flexib... | 11/22/2011 |
| 7356936 | Apparatus and method for measuring coating accumulations in a spray booth A method and apparatus are provided for viewing an object (such as a coating overspray accumulation) disposed in a difficult to view area (such as the underside of a lower trough or weir of a cleaning apparatus) and for measuring a distance between first and second ... | 04/15/2008 |
| 7162927 | Design of a wet/wet amplified differential pressure sensor based on silicon piezoresistive technology The invention provides pressure sensors for use in wet environments. A pressure sensor package according to the invention has a housing having a pair of cavities separated by a wall member. Sequentially contained within one cavity is a conductive elastomeric seal pa... | 01/16/2007 |
| 7094008 | Power driver bit self-centering and positioning apparatus A portable combined clamp and bit guide assembly guides a bit, turned by a power driver, into the exact center between the opposing faces of the clamp. The clamp is designed to hold workpieces having substantially parallel edges and a substantially linear centerline... | 08/22/2006 |
| 7047832 | Apparatus for measuring gas exchange A container having a port for holding a liquid medium and a reactant that interact to produce a change in gas levels within the container. A removable stopper for insertion into the port creating an airtight seal. A tube extending through the stopper into the contai... | 05/23/2006 |
| 7029199 | Automatic ground marking method and apparatus An automatic ground marking apparatus including a carriage (1) responsive to carriage control signals for traversing the ground (5), the carriage having a controllable steering and drive system, a controllable marking system and a position determining ... | 04/18/2006 |
| 7024781 | Vial illumination feature for a tool such as a level A vial illumination feature for a tool, such as a level, is configured so as to emit light toward a vial when the tool is used in a darkened environment. The vial extends across an opening or a space defined by the tool, and one or more vial retainer members engage ... | 04/11/2006 |
| 6907133 | Automatic surveying system An automatic surveying system includes a telescopic optical system; an image pickup device for picking up an image of a graduated face of a level rod, to which the telescopic optical system is to be collimated, and converting the image into image data; a memory whic... | 06/14/2005 |
| 6655036 | Aid apparatus for level surveying instrument An aid apparatus for level surveying instrument comprises a housing having a receiving chamber therein, two channels at opposite ends of the receiving chamber respectively, a window at one side of the receiving chamber, and a socket opening at the side wa... | 12/02/2003 |
| 6493954 | Fluid-actuated level device A fluid-actuated level device for use, for instance, in the building trades, discovers points lying on a horizontal plane with a reference point. The level device has a tube with a referenceend and a working-end, and a housing unit attached to the referen... | 12/17/2002 |
| 6425299 | Relative height gauge A gauge for monitoring the relative height of two points comprises a generally tubular conduit extending from a first end thereof via a first limb thereof to a monitoring position spaced from the first end and via a second limb of the conduit from the mon... | 07/30/2002 |
| 6088922 | Method and apparatus for hydrostatical leveling A method and apparatus for hydrostatic leveling including a pair of liquid filled containers connected by a liquid hose for equalizing static pressure in the mercury pools in the indicating heads and a gas hose for equalizing the gas or vapor pressure wit... | 07/18/2000 |
| 5937529 | Apparatus for measuring vertical displacement An apparatus for measuring the vertical displacement of a plurality of horizontally spaced locations on a variety of surfaces is disclosed. A fluid reservoir having a plurality of outlets is freely suspended on a support means, such as a tripod. A plurali... | 08/17/1999 |
| 5659966 | Hydrostatic level measuring and survey apparatus A hydrostatic system for measuring the elevation at two spaced locations. A first stand having a multi-leg base includes a toroidal tank slidably mounted on a shaft that extends through a tank central aperture. The legs include a bracket arrangement to pe... | 08/26/1997 |
| 5617640 | Level position measuring method, level marking method and level marking apparatus comprising a tube, capable of directly measuring a height A level marking apparatus capable of directly measuring height comprises an elastic synthetic resin tube. One end of the tube is secured to a pressure sensor capable of producing an output voltage and air-tightly sealed, and the other end of the tube is c... | 04/08/1997 |
| 5459933 | Level position measuring method and device A level position measuring method including providing a hose having a first end and a second end; filling the hose, at least partially, with a liquid so as to form a water head; leaving the first end of the hose open to atmospheric pressure; closing the s... | 10/24/1995 |
| 5367782 | Level marking method and level marking apparatus A level marking method including providing a hose having a first end and a second end; filling the hose, at least partially, with a liquid so as to form a water head; leaving the first end of the hose open to atmospheric pressure; closing the second end o... | 11/29/1994 |
| 5309645 | Combination plumb or level and height setting instruments An instrument set for plumbing or leveling and relative height setting of members such as posts or beams, each instrument including orthogonal sides and a feature projecting from the top of one side allowing each instrument to be set atop a respective pos... | 05/10/1994 |
| 5164708 | Single unit, multi signal, variable plane measuring and leveling device The invention is an improved level indicating and elevation indicating system using a hose containing fluid having a first and a second end, capable of being operated by a single person. An electronic method is used to indicate when a float at the first e... | 11/17/1992 |
| 5131156 | Leveling apparatus and method A leveling apparatus includes at least two scales defined by enclosed receptacles, each having a cavity and a port into the cavity. Each receptacle also preferably has a top wall with a convex inner surface defining the top of the cavity. The top wall als... | 07/21/1992 |
| 5111588 | Level vial A level vial includes a pair of elongated vessels, each having a top open end, a bottom open end and a transparent tube portion having a flat side wall extending between the top open end and the bottom open end. A flexible elongated pipe has two ends resp... | 05/12/1992 |
| 5101571 | Hydrostatic plumber's level A vertical-difference measuring instrument comprising an entirely closed liquid system containing, as the only fluid, only substantially noncompressive liquid, the liquid system comprising a variable-volume reference reservoir and a sensing reservoir inte... | 04/07/1992 |
| 5090128 | Device for measuring or controlling change of level between several points A device measures or controls a change of a level or a variation in a change of a level between several points. The device includes closed vessels (2) placed respectively at each of the points. The vessels are partially filled with a liquid (53) and are c... | 02/25/1992 |
| 5074049 | Vial A level vail includes a pair of elongated tubes, each having a top open end and a bottom open end. A pipe has two ends, respectively connected to the bottom ends of the elongated tubes. Water is contained in each of the elongated tubes, in each of which a... | 12/24/1991 |
| 5001926 | Device for determining the vertical distance between two elements at unequal heights A device for measuring the pressure difference between the two ends of at least one flexible tube connecting together the positions occupied by two elements. In a preferred embodiment, to a summing circuit are applied the signals delivered by two differen... | 03/26/1991 |
| 4991302 | Open circuit leveling measuring system An open circuit measuring system (10) for discerning the vertical distance between selected locations is provided. The system includes first and further members, each having a base portion (14) with a bottom (16), and an upright tube (18) which contains l... | 02/12/1991 |
| 4984791 | Green inclination level for golfers The method of facilitating putting a golf ball into a cup on a sloped green comprises providing a pair of right angularly related float levels within a hollow frame with each float level having an axis, index marks and a sighting rod in the frame; orienti... | 01/15/1991 |
| 4977680 | Loft indicator and lie detector for golf club heads A clinometer releasably securable to a golf club head to indicate its loft and to detect its lie. The clinometer has a sector shape and its circumferential extent is sixty degrees of arc. An arcuate bubble tube having accompanying indicia to indicate diff... | 12/18/1990 |
| 4976495 | Method and apparatus for steering a mining machine cutter The trailing drum of a double-ended ranging drum shearer is steered in a seam by producing an algorithm which determines, as a result of information derived from signals from the machine dependant on its tilt, direction and amount of movement along a face... | 12/11/1990 |
| 4972596 | Trailer measuring system A trailer measuring system (10') for leveling a trailer during setup and for indicating deviations from an initial position of level of a trailer is provided. The device (10') includes a reservoir (16') and a plurality of measuring tubes (18') which can b... | 11/27/1990 |
| 4947556 | Plumber's level A spirit level assembly attachable to a free end of a pipe section being installed includes a housing block of generally rectangular cross-section in which a series of viewing ports are formed through opposed side walls thereof. Fitted into each of the vi... | 08/14/1990 |
| 4894924 | Method for measuring level of large structure Displacement sensors which are communicated with a stationary reference side are placed at the measuring points of a large structure. Displacement at each measuring point is electrically measured by utilizing the fact that the liquid levels at the station... | 01/23/1990 |
| 4794704 | Height level measuring device A height level measuring device is provided and consists of an elongated transparent flexible hollow tube with scales at each open end thereof. A predetermined amount of liquid is placed within the tube so that the liquid will seek same height level at bo... | 01/03/1989 |
| 4773161 | Portable liquid level A liquid level comprising a bottle for holding leveling liquid and means in its lower end for connecting to a length of hose. The bottle has a filler opening in its upper end and integral means for storing the hose around the bottle. The level may include... | 09/27/1988 |
| 4769918 | Level indicating device The invention relates to a level indicating device including a container or reservoir and a length of tubing extending from the container near the bottom thereof. Narrow, inverted cups are adhered to the sides of the container so that they may be slipped ... | 09/13/1988 |
| 4759134 | Flexible level A leveling instrument is provided with a flexible length of tubing extruded with a pair of thin-walled, balloon-like diaphragms at opposite ends thereof. The tubing contains a flow passage filled with liquid in communication with atmospheric pressure acti... | 07/26/1988 |
| 4691445 | Horizontal evaluation datum scope An instrument for establishing a horizontal plane for leveling ceilings, tables, floors and the like, consisting of a reference head having a translucent liquid reservoir, an adjustable field head, and a hose for interconnecting the two heads. With the le... | 09/08/1987 |
| 4686773 | Structure leveling system A structure leveling sytem comprises a plurality of portable members each including a base having a bottom and a transparent tube open at its having a bottom and a transparent tube open at its top and upstanding from the base and provided with graduations... | 08/18/1987 |
| 4669484 | Automatic leveling device for hemodynamic pressure measuring system The present leveling device is operable with a hemodynamic pressure measuring system which includes a pressure catheter to be implanted in the body of the patient and pressure measuring device connected by a tube to the catheter and supported on a vertica... | 06/02/1987 |
| 4651433 | Pressure sensitive leveling device A leveling device includes a first and second pressure cell that are interconnected by lengths of fluid filled, flexible tubing. Each of the pressure cells is associated with a strain gauge for sensing the differential pressure of the fluid between a regi... | 03/24/1987 |
