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Felix Hoffmann, a German chemist, was searching for something to relieve his father's arthritis. In doing so, he "rediscovered" acetylsalicylic acid and in 1900, patented a stable process for developing it. Hence, we have aspirin.
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| Number | Title | Issue Date |
| 7600324 | Level A level having a mounting body provided with a bubble tube measuring portion disposed in a container case, the mounting body is adjusted by microrotation in relation to the container case to correct a position of the bubble tube, wherein a shaft insertion hole is pr... | 10/13/2009 |
| 7363719 | Pocket level A pocket level having a detachable line level whose bubble vial doubles as the pocket level's horizontal bubble vial, and an angle finder for enabling the determination of the angle of an inclined surface which includes a bubble vial housed in a wheel rim directly r... | 04/29/2008 |
| 7360317 | Level having an adjustable mechanism for truing to acquire an exact reading A level having an adjustable mechanism for truing to acquire an exact reading which comprises an elongated rigid body being an I-shaped frame having a web with a first flange transversely extending across a first long end of the web and a second flange transversely ... | 04/22/2008 |
| 7210243 | Level with adjustable fastener locators A level assembly includes a housing having a level mounted within. The housing includes a first arm and a second arm slidably attached to the housing. The first and second arms are both stored in storage positions. Fastener locators associated with each arm are both... | 05/01/2007 |
| 7166044 | Putter's training aid A device and a method for training a golfer to putt a golf ball into a hole. The device includes a slope indicator, which provides a visual indication of the slope of the slope of the golf green at the rim of the hole. The golfer marks the slope and practices differ... | 01/23/2007 |
| 7152335 | Omnidirectional torpedo level having magnetic mounts and adjustable protractor An omnidirectional torpedo level composed of non-ferrous material has a central web and parallel side flanges defining a torpedo level geometry. The central web and side flanges define windows within which are mounted vertical and horizontal tubular spirit level ele... | 12/26/2006 |
| 7047654 | Retainer clips for securing a cylindrical level vial Hand tool (1) including a pair of retainer clips (7A,7B) for securing a cylindrical level vial (6) in a suitable recess (3), and method of assembly therefor. ... | 05/23/2006 |
| 6990742 | Wave level A level having a frame with an edge rail and a web extending from the edge rail at right angles. A web opening is provided in the web. A capsule assembly is mounted on the web at the web opening. The capsule assembly has a transparent capsule having a liquid therein... | 01/31/2006 |
| 6910279 | Holder for a graduated element A graduated element attachment system in a position measuring system, the graduated element attachment system including a graduated element having a circumferential face and a holder. The holder includes a plurality of resilient elements, wherein each one of the plu... | 06/28/2005 |
| 6901671 | Level capable to measure minute inclination The present invention relates to a level. More particularly, the present invention relates to a right/left and vertical level that is capable of right/left and verticality/horizontality measurement at the same time, and is capable of exactly measuring an inclined an... | 06/07/2005 |
| 6782628 | Level having rotatable vial support device A level includes a plate secured to a casing and rotatable relative to the casing between a closed and an open positions. A bubble vial is attached to the plate. The plate has one or more catches for openably securing the plate to the casing. The casing includes one... | 08/31/2004 |
| 6591510 | Method and apparatus for securing and aligning bubble vials An apparatus and method for securing and aligning level indicators such as bubble vials includes the use of a spring structure with a screw adjuster. In some embodiments, multiple spring structures are positioned perpendicular to one another to allow prec... | 07/15/2003 |
| 6477781 | Angle spirit level device There is shown a spirit level device having a basic body element and a bubble element which pivots around an axis in its inclination towards the basic body element. An adjusting bubble element is fixed at the basic body element so that the middle part the... | 11/12/2002 |
| 6176020 | Anti-thermal expansion vial mounting system A bubble vial is mounted in a carpenter's level by a pivot rod on one side of the vial and an eccentric cam rod on the other side of the vial. The vial housing is supported in the pivot rod so as to be able to move, due to thermal expansion differences be... | 01/23/2001 |
| 6158134 | Equipment leveling device The present invention entails an equipment leveling device comprising a leveling head having a leveling instrument incorporated therein and a series of spaced apart support legs secured to the leveling head and projecting radially therefrom for engaging a... | 12/12/2000 |
| 6148530 | Level with snap action vial holder A spirit level having a sub-assembly on the body. The sub-assembly has a vial holder having two spaced pockets. A curved vial having two ends received in the pockets and resilient ribs having a curve matched to the vial and engaging the vial to hold the v... | 11/21/2000 |
| 5992033 | Shock absorbing, easily calibrated vial system for a carpenter's level A carpenter's level provides a three point mounting for a vial housing within a level frame. The frame is a square cylinder, preferably an extruded part. The vial housing mounts within the frame on a pivot pin and is biased by a spring toward one side wal... | 11/30/1999 |
| 5966826 | Dual usage level marking instrument A dual usage level marking instrument is provided that includes a leveling rod. This rod has a dotted-type laser device fixed at one end and a straight-type laser device fixed at the other end. Leveling elements are installed on this rod. The dotted-type ... | 10/19/1999 |
| 5755623 | Level accessory for golf putters A golf green level determining removable accessory for temporary securement to a shaft of a golf putter, to in effect create a level tool having the length of the golf putter. With this accessory temporarily in place, the golfer lays his or her putter at ... | 05/26/1998 |
| 5546670 | Multi-purpose measuring instrument for wood working machines A multi-purpose measuring instrument for wood working machines including a body having a horizontal side and a vertical side. The edge of the horizontal side is provided with magnets and the vertical side is provided with slide blocks capable of longitudi... | 08/20/1996 |
| 5509657 | Position indicator device for golf clubs A golf club positioning and position indicating device having a mounting base that is releasably attached to the shaft of a golf club below the handgrip of the club. A positioning head support for support and orientation of a positioning head which can be... | 04/23/1996 |
| 5444918 | Arrangement for aligning an apparatus unit An arrangement for aligning an apparatus unit with respect to the direction of gravity. The arrangement includes a first support device, a second support device and a third support device acting on a first support point, a second support point, and a thir... | 08/29/1995 |
| 5421094 | Adjustable level An adjustable level having an angled base with legs extending normal to one another from a common edge and with magnets spaced along and extending fully through each leg; an L-shaped bracket having at least one bubble housing fixed to a leg thereof; a pos... | 06/06/1995 |
| 5359499 | Vertical/horizontal indicator for a vehicular headlamp The reflector of the headlamp is pivotally supported within a housing for vertical tilting about a horizontal axis and for horizontal pivoting about a vertical axis. A bubble level is carried by the reflector and may be adjusted relative thereto to a leve... | 10/25/1994 |
| 5174572 | Golf club having a position indicator mounted thereto A golf club includes a shaft and a rubber mounting seat which is provided on the shaft. The mounting seat confines a blind bore with a hemispherical bottom and has an open top end and an annular flange which projects inwardly from the open top end. A posi... | 12/29/1992 |
| 5103569 | Multipurpose combination leveling tool Disclosed is a leveling tool that has three leveling indicators mounted thereon, one of which is removable and usable as a separate tool when bending electrical conduit. A calculator is integrated into the leveling tool for performing calculations during ... | 04/14/1992 |
| 5063679 | Protractor bubble level The present invention relates to an improved leveling device for use with various tools or other objects during a construction or repair process. A bubble level is mounted along the straight edge of a semi-circular protractor. The protractor is movably co... | 11/12/1991 |
| 5031081 | Headlamp for power vehicle A headlamp for a power vehicle comprises a reflector mountable in a chassis and turnable for adjusting its inclination, a water level provided on the reflector for controlling its inclination, the water level having adjusting marks and being displaceable ... | 07/09/1991 |
| 5025568 | Photographic enlarger alignment tool and method for aligning a photographic enlarger An improved photographic enlarger alignment tool is disclosed comprising a base plate and a circular level adjustably attached to the base plate by three or more screws adapted to permit calibration of the device in all axes of a plane and alignment of a ... | 06/25/1991 |
| 5001838 | Spirit level The spirit level, for use by carpenters, bricklayers or the like has a body comprising an elongate extrusion with at least one flat supporting edge 3. An outer rotatable member 10 is rotatably mounted in a transverse circular aperture in the elongate extr... | 03/26/1991 |
| 4996777 | Snap-in level vial cover A snap-in vial cover for retaining a level-indicating vial on the web of a frame includes first and second vial cover members. The vial cover members are substantially identical in construction. A vial is adapted for placement within a pair of oppositely ... | 03/05/1991 |
| 4989327 | Adjustable side draft indicator A transparent shape retentive and flexibly resilient tubular member is supported from a farm tractor in an upstanding plane disposed transverse to the tractor and is vertically bowed. The interior of the tubular member includes gravity responsive indicato... | 02/05/1991 |
| 4964219 | Combination plumb/level instrument for a try square A combination plumb/level device for removable attachment to a try square of magnetizable material to enable the square to be used as a level or a plumb. The device comprises a spirit level, and a holder for the level. The holder has a magnet associated t... | 10/23/1990 |
| 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 |
| 4848003 | Positioning device Apparatus is described for positioning a tilt meter (12) in a horizontal plane (14) and maintaining it horizontal despite temperature changes, with greater precision than heretofore. Leveling screws 25-27 which hold the upper surface (18) of a base member... | 07/18/1989 |
| 4791731 | Vertical surface installing device A device for installing an article on a vertical surface is disclosed. The device includes a base and a first longitudinal member connected to the base. A second longitudinal member is slidable longitudinally relative the first member. The second longitud... | 12/20/1988 |
| 4774767 | Water level A water level or spirit level having at least one water level member whose angular adjustment relative to the contact surface can be changed. The water level member is rotatably mounted on the level body or a structural part fixedly connected to the level... | 10/04/1988 |
| 4635376 | Angle measuring apparatus Angle measuring apparatus, particularly for measuring doctor blade angle, comprises an elongate support (1); a horizontal level detecting device (4) pivotally connected to an upper surface of the support (1); and means (5, 8) for determining the angle bet... | 01/13/1987 |
| 4571845 | Polycast level instruments with means for retaining level vials therein A specially contoured cavity or recess for the precise alignment and retention of a uniform cylindrical level vial in Polycast plastic level instruments or other hand tools. The recess is accurately oriented with respect to tool measuring surfaces during ... | 02/25/1986 |
| 4564322 | Drill scope A drill scope comprising a calibrated protractor that can be read directly in terms of angle of tilt of the drill bit and a pivoting spirit level support means with tilt angle marker and bull's-eye bubble level that can be pivoted to a selected angle of t... | 01/14/1986 |
