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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 |
| 7293328 | Device for closing a door A device for closing a door, including a spring element, an attachment element for fixing the device to a door, and an actuation element. The actuation element and the attachment element are linked at opposite ends of the spring element in such a way that, when the ... | 11/13/2007 |
| 7216400 | Door hold and release mechanism A door hold and release mechanism is provided including a housing mounted onto the pneumatic cylinder of a door check or closer having a piston rod extending from one end of the cylinder. The piston rod passes through an oversized hole in a drop stop which restricts... | 05/15/2007 |
| 7134168 | Door closer with pre-set stops A door closer comprises a cylinder with an extensible and retractable rod. The cylinder has a first end adapted to be secured to a door frame, while the rod has an outer end adapted to be connected to the door. The rod has a series of grooves along the length. A paw... | 11/14/2006 |
| 7100604 | Latching system and method for pressure chambers A latching mechanism for a pressure chamber for hypobaric use is disclosed. The mechanism includes one or more pin modules positioned on a periphery of a door of the pressure chamber, the door being adapted to open into the chamber and abut a frame of the pressure c... | 09/05/2006 |
| 7076834 | Cabinet door buffer bar A cabinet door buffer bar includes a hollow tube, a shaft, an elastic element and a sliding member. The sliding member and the inner wall of the hollow tube form different intervals there between so that a resilient member mounted thereon receives varying constraint... | 07/18/2006 |
| 6978516 | Apparatus for controlling various movements of a door Apparatus for controlling various and different movements of a door, said apparatus having a door hinge assembly with a hinge pin having a plurality of bearing surfaces to reduce stress and wear on a hinge pin housing, a torque mechanism for pre-torquing and torquin... | 12/27/2005 |
| 6976289 | Door closer with door arresting mechanism A door closer having a door arresting mechanism to arrest a door in an opened position that includes a cylinder and piston assembly wherein the arresting mechanism includes a cam member having an arresting dwell cam profile and an indexing profile, and an associated... | 12/20/2005 |
| 6976288 | Rod gripper A bar or rod gripper for arresting the linear axial movement of a rod, e.g. the piston rod of a door closure between a door open or closed position, that includes a compressible bushing slidably disposed about the rod or bar, and a canter washer disposed about the c... | 12/20/2005 |
| 6931693 | Damper mechanism A damper mechanism installed on an opening and closing device that has an arcuate plunger with the same radius of curvature of the cylinder it slidably mates with. A torsion coil spring causes the sliding action of the plunger into the cylinder in one direction.... | 08/23/2005 |
| 6904643 | Door closer hold-open apparatus The present invention relates to a hold-open apparatus for controlling the position of a door, preferably a screen door or storm door. The apparatus is used in conjunction with a piston assembly and can maintain a door in a predetermined open position, such as about... | 06/14/2005 |
| 6615449 | Releasable locking assembly for a door control cylinder A releasable locking assembly for a door control cylinder is disclosed. The assembly fits over the rod of the door control cylinder and includes a locking flange member maintained in a confined space within a pair of concentric closed end cup members. The... | 09/09/2003 |
| 6557300 | Propping support for a chest A propping support for a chest, having a lid rest fastened on an inside surface of the lid of a chest, and a wall rest connected with the body of the chest. The lid rest and the wall rest are connected by a support device which secures the lid of the ches... | 05/06/2003 |
| 6202253 | Storm door cylinder lock A cylinder lock door closure device. In an exemplary application, the cylinder lock door closure device includes a cylindrical housing, a piston assembly, an arm assembly, a cylindrical catch piece and a hard stop whereby when a door is opened past 90° o... | 03/20/2001 |
| 5749122 | Interior door closer and method A hidden door closer is based upon the positioning of a torsional spring adjacent the hinge edge of a door, which door has a hollow interior hidden closer portion with a closer mounted in an access opening so that the torsional spring and its housed assem... | 05/12/1998 |
| 5083342 | Door closure delay device A door closure delay device is provided for connection to a door and a frame, whereby the user may delay the closing of the door by actuating a pneumatic timer which is coupled to a pneumatic or hydraulic door closer. The door closer includes a housing, a... | 01/28/1992 |
| 4991255 | Pneumatic door-closer usable for left-hinged and right-hinged doors A pneumatic door-closer includes a door-closer body pivoted to a generally L-shaped crank unit which is mounted pivotally on a support. The unit includes a long crank arm member and a short crank arm member, and can be adjusted to change the positions of ... | 02/12/1991 |
| 4639969 | Door closer mechanism This is an improved door closer mechanism for attachment to, or incorporation into, a standard spring type door closer, or for use with a standard spring type door closer. It is particularly useful for screen or storm doors. The unique feature is a revers... | 02/03/1987 |
| 4486917 | Door closer with a compressible braking sleeve A door closer includes a spring-loaded piston forming part of a conventional pneumatic dashpot, which retards the speed of a door during closing, and an elastomeric sleeve which is longitudinally compressed during opening of the door to retard the speed o... | 12/11/1984 |
| 4483044 | Pneumatic door closer having resilient braking sleeve and cooperating piston rod incremental braking enlargements Door speed is controlled by a pneumatic dashpot including a spring-loaded piston having a piston rod which extends through an elastomeric silicone rubber braking sleeve which is longitudinally compressed as the door opens to increase the friction between ... | 11/20/1984 |
| 4430770 | Door operating mechanism A door-operating mechanism is disclosed which is particularly suited for use with hingedly mounted swinging glass doors of a refrigerated display cabinet. The door operating mechanism includes an extensible gas spring biased toward an extended condition, ... | 02/14/1984 |
| 4357731 | Door closer with hold open feature A dashpot type door closer having an internal mechanism which will latch the door in an open position when the door is opened a sufficient distance, and which will release the door from a latched open position when the door is moved slightly more in the o... | 11/09/1982 |
| 4190926 | Door guard A door guard for a swingable door that is mounted in a doorway having a door closer affixed to the doorway permits the door to open beyond the point which would normally be the widest open position allowed by the door closer and slows the rate of movement... | 03/04/1980 |
| 3934306 | Door closure device A safety device for automatically closing a door in response to a predetermined condition, such as fire, is provided by a selectively disengageable brake operatively associated with a pivotable door closure arm. The brake includes a flexible cable wrapped... | 01/27/1976 |
