Famous Patents
The ice cream cone was invented at the St. Louis Worlds Fair by Ernest Hamwi in 1904. His waffle booth was next to an ice cream vendor who ran short of dishes. Hamwi rolled a waffle to hold ice cream and the cone was born.
PatentStorm News
Make the Most of Our Site
See this month's Top Inventors and Most Cited Patents.
Stay on top of the latest innovations by subscribing to an RSS feed.
Registered users: Manage your profile.
| Number | Title | Issue Date |
| 7293805 | Safety door central release device This invention relates to a type of safety door central release device which can be used to close the safety door automatically when electric power is disrupted. It comprises a cord that is tied to a mechanism having potential energy on one end, and extended to a fa... | 11/13/2007 |
| 7234201 | Door closer power adjusting device A door closer power adjusting device for a door closer having a spindle driven by a compressed spring with a movable plate for adjusting spring compression, or with a screw for adjusting spring compression, between a high and low level of compression. A powered unit... | 06/26/2007 |
| 7111359 | 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... | 09/26/2006 |
| 7051403 | Electromechanical swing leaf operator The invention relates to an electromechanical swing leaf operator having a door closer (1) with an eccentrically supported pinion (6) that presents a circular rolling curve and meshes with a toothed rack (5) being disposed at a piston (4)... | 05/30/2006 |
| 6997090 | Safety systems for power equipment A saw with a safety system is disclosed. The safety system includes a detection system adapted to detect contact between a person and a blade while the blade is moving. The safety system further includes a brake system adapted to engage the blade and to stop the bla... | 02/14/2006 |
| 6363575 | Door actuating system A door actuating system for the leaf of a fire door includes a safety fuse that detaches the fixture between the housing of the door actuating system and an arm on the door or the door frame, which then falls on the floor and are no longer in contact with... | 04/02/2002 |
| 6250326 | Dual temperature fire damper releasing system A mechanical dual temperature damper closing mechanism having a primary link that separates when the ambient temperature reaches approximately 74° F., closing the damper. The new mechanism provides a reliable means for reopening the damper to allow airfl... | 06/26/2001 |
| 6092334 | Door locking device for a door closer having a fire actuated mechanism for unlocking the door locking device A door locking device for locking a door in predetermined, opened positions and automatically unlocking the door from the open positions in the event of a fire. The door locking device comprises a rotating body which includes channels and a support body w... | 07/25/2000 |
| 5864920 | Door closer for the non-fire side of a fire-door safety installation A door control device for use on a non-fire side of a fire-door mounted in a door frame in a fire-door safety installation has a door closer assembly filled with a hydraulic damping fluid and attached to a non-fire side of the fire-door by at least one fa... | 02/02/1999 |
| 5709009 | Door closer for the non-fire side of a fire-door safety installation A door control device for use on a non-fire side of a fire-door mounted in a door frame in a fire-door safety installation has a door closer assembly filled with a hydraulic damping fluid and attached to a non-fire side of the fire-door by at least one fa... | 01/20/1998 |
| 5674027 | Exaggerated actuation and bearing-free rotational mobility in smart hinges The implementation of smart materials (shape-memory alloys (SMA) or piezoceramics) as integral actuating devices for single degree-of-freedom (DOF) hinges, thereby providing mobility as well as actuation to a wide range of mechanisms used in industrial, a... | 10/07/1997 |
| 5645128 | Fire safety grease seal The invention is a grease and dirt seal that is interposed in the connection between a flared tube and an adapter for engaging a support frame. The seal is circular with flat planar surfaces and a throughgoing aperture centrally positioned and adapted to ... | 07/08/1997 |
| 5393263 | Access door eliminator for curtain fire dampers A mechanism is provided to engage a resettable link in a curtain-type fire damper and release and reset that link so that the blades of the damper can unfold. The mechanism is actuated remotely and mechanically without the need for an access door.... | 02/28/1995 |
| 5222277 | Intermittently and reversibly operable hot wax energized hinge A powered hinge powered by a hot wax linear actuator, which can provide for bi-directional rotation of the hinge as the consequence of sequential and intermittent energizing and deenergizing sequence of the actuator.... | 06/29/1993 |
| 4967444 | Device for damping the closing movement of a dual door spring-loaded or closure and closure control therefor A double-winged door spring is biased for closing with a mechanism for damping of the closure movement and includes a closure sequence control, particularly of a fire-resistant door, in which the damping of the movable door portion is accomplished through... | 11/06/1990 |
| 4905344 | Heat actuated link A resettable heat actuated link having an associated releasable member comprises first and second gripping portions for acting cooperatively to engage the releasable member in a normal position and to release the releasable member in an activated position... | 03/06/1990 |
| 4842106 | Rate controllable damping mechanism A rate controllable damping mechanism is disclosed. The mechanism includes a chamber disposed within a housing; an element mounted for movement within the chamber; a damping material, preferably a low melting temperature metal alloy, in the chamber for pr... | 06/27/1989 |
| 4842136 | Dust-proof container having improved construction for holding a reticle therein A dust-proof container for keeping therein a mask or reticle usable to transfer a pattern onto a semiconductor wafer for the manufacture of integrated circuits, is disclosed. The container includes a casing within which supporting pins for supporting the ... | 06/27/1989 |
| 4817912 | Bi-metal operator for smoke, fire and air control damper A damper operator for use with a damper having a frame and a damper blade pivotally associated with the frame, which damper operator comprises a bi-metallic element provided with a heating pad which may be remotely activated to control the damper. The bi-... | 04/04/1989 |
| 4805261 | Resettable fire link A resettable fire link includes a first member (12) that pivotally supports a latch arm (20) thereon with a bi-metallic coil spring (30) interposed between the first member and the free end of the latch arm to normally bias the latch arm into a latched po... | 02/21/1989 |
| 4796420 | Fusible link construction A fusible link has a tubular housing having a recess in one side thereof in communication with a bore at one end of which one end of a thermally sensitive strut is seated. A yoke has at one end thereof an arm against which the opposite end of the strut se... | 01/10/1989 |
| 4763711 | Fire damper A fire damper having a temperature-sensitive link assembly designed to permit ease of maintenance of the damper. In one embodiment, the link assembly includes a fusible link that extends across and holds the blades folded. At each end, the link is coupled... | 08/16/1988 |
| 4715146 | Apparatus for closing fireproof doors An apparatus is disclosed for releasably locking a fireproof door in an open position. A latch mechanism includes a hook connected to the door. The hook is releasably engaged with an actuator plate swingable between a latching position and a release posit... | 12/29/1987 |
| 4706330 | Automatic closing activator This invention concerns a traction device such as a door closure made from memory alloy. In the preferred form the traction device comprises an elongated length of memory alloy, heating means operable to heat the element to restore it to its original shap... | 11/17/1987 |
| 4656690 | Fireproof door closer and holder having a solenoid and a toggle mechanism In an apparatus for closing a fireproof door, a holding device comprises a latch mechanism and a slider. The latch mechanism comprises an actuator member swingably supported in a housing which is provided with a tubular portion wherein a stopper is insert... | 04/14/1987 |
| 4598494 | Apparatus for closing fireproof doors In an apparatus for closing a fireproof door in case of emergency, the fireproof door and a release, which is secured to a door frame, are interconnected by a link mechanism comprising first, second and supplemental link arms. One end of the first link ar... | 07/08/1986 |
| 4555981 | Damper operator for use with air, smoke and fire dampers A damper operator for use with a damper having a frame and a damper blade pivotally associated with the frame, which damper operator comprises a drive rod; a pair of lever arms which are pivotally associated with each and which extend between the drive ro... | 12/03/1985 |
| 4536916 | Door holder-closer having a control signal operated hold-open function and a mechanical override facility A door closing apparatus is described which embraces a unit for generating a closing force, a lever attached thereto via a releasable clutch for actuating the door and a controllable blocking device. The releasable clutch consists of a threaded connection... | 08/27/1985 |
| 4506407 | Releasable hold-open device for a door closer A releasable hold-open device for a spring-impelled, regulated door closer has a door motion follower adapted to be releasably held in a door-open position. An actuator is arranged to retain or release the follower under control of a permanent magnet that... | 03/26/1985 |
| 4487214 | Damper blade actuating mechanism Damper blade actuator assembly for use in association with a damper having damper frame means adapted to be associated with an air duct system, and defining an air flow opening, and movable damper blade means operable for partially or completely obstructi... | 12/11/1984 |
| 4483043 | Automatic door closer An automatic door closer has an elongated fluid-filled housing having a closed end and an opposite open end, a plug closing the open end of the housing, a first piston reciprocatably arranged in the housing and dividing the latter into a first pressure sp... | 11/20/1984 |
| 4474167 | Latch for a butterfly damper An air/smoke/fire damper including a frame and a pair of damper blades pivoted for rotation within the frame between an open and a closed position, and comprising a heat responsive latch including mounting straps associated with each of the damper blades;... | 10/02/1984 |
| 4472999 | Damper operator for use with air, smoke and fire dampers A damper operator for use with a damper having a frame and a damper blade pivotally associated with the frame, which damper operator comprises a drive rod; a pair of lever arms which are pivotally associated with each and which extend between the drive ro... | 09/25/1984 |
| 4432609 | Radiation protection louver An improved radiation protection louver system is described which comprises a movable louver panel hinged to a rotatable shaft through a thermally sensitive closure hinge member comprising a martensitic structure alloy exhibiting the characteristic of cha... | 02/21/1984 |
| 4346554 | Fusible link construction A fusible link having two body members separably coupled to one another and normally prevented from separating by a collapsible strut. One body member has an opening in which the other body member is slideably accommodated, such other body member having a... | 08/31/1982 |
| 4301569 | Quadrant operator A novel operator for use with a damper is disclosed comprising a plurality of pivotally interconnected damper operator members which are pivotally associated with the damper blade linkage and frame, such that they may be moved to an over-center locking po... | 11/24/1981 |
| 4292707 | Frictional retainer for holding a door open A door in combination with a retainer which uses a frictionally restricted rotating disc to hold the door open. Closing of the door causes the disc to rotate and release the door.... | 10/06/1981 |
| 4287638 | Inside/outside link A releasable link is mounted on the wall of a duct, plenum, chamber or the like. The link releases in response to a predetermined increase of temperature within the duct. The link is resettable without having to gain access to the interior of the duct. In... | 09/08/1981 |
| 4287639 | Door closer permitting free-swing and regular-closer modes Door closer of the type which holds the door open until an associated electric circuit is opened or closed. Provides means for free swinging of the door when the door closer is "cocked". This is achieved by a drive plate interposed between the closer shaf... | 09/08/1981 |
| 4267619 | Controlled release door holder A controlled release door holder comprises a housing having a portion defining a cylinder for containment of a fluid, a piston received in the cylinder for movement axially thereof and dividing the cylinder into first and second chambers, and a linkage be... | 05/19/1981 |
