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| Number | Title | Issue Date |
| 7204291 | Modular lid and actuator for underwater pool cover drum enclosure The present invention is a modular lid system for an underwater swimming pool cover or other underwater enclosure. The modular lid has a rigid lid portion which has an overall buoyancy such that the lid portion closes the enclosure underwater by force of gravity. Th... | 04/17/2007 |
| 7178290 | Manhole cover having a locking crossbar A pit cover includes a casing, a cross bar and cover plate. The casing has a peripheral wall in the general shape of a rectangle, with open opposite ends and. The cross bar is coupled to and extends across the wall on an inside of the casing. The cover plate is conf... | 02/20/2007 |
| 6935000 | Gate hinge and method for mounting gate opener The disclosed device is directed toward a lifting gate. The lifting gate comprises a barrier member having a top and a bottom opposite thereof. A top bracket assembly is coupled to the top of the barrier member. The top bracket assembly includes a top bearing couple... | 08/30/2005 |
| 6551015 | Method of and system for venting out buildup of explosive gases in a manhole A method of and system used for venting out buildup of explosive gases in a manhole caused by an explosion and including a support frame, a two inch thick plate member positioned on top of the support frame, a plurality of restraining assemblies and a man... | 04/22/2003 |
| 6361430 | Balanced ventilation doors A pair of door-sections make up a mine ventilation door. The door-sections are hinged to the side-walls of the passage. One of the door-sections opens upstream and the other downstream, so one is blown open, and the other blown closed, by winds passing th... | 03/26/2002 |
| 6350081 | Manhole restraining system for venting out explosive gases in a manhole A manhole restraining system used for venting out explosive gases in a manhole caused by an explosion. The manhole restraining system comprises a support frame, a two inch thick plate member positioned on top of the support frame, a plurality of restraini... | 02/26/2002 |
| 6010277 | Road speed limiting device A variable speed bump apparatus comprising a pivoting ramp element hinged at one end, at least one piston and cylinder assembly supporting the pivoting ramp element and a first flow control valve and wherein the first flow control valve is operative to co... | 01/04/2000 |
| 5956901 | Gas driven hatch cover assembly A hatch assembly having a hatch cover biased to a normally closed position. The hatch cover is connected to an impeller contained and rotatable within a impeller chamber of a housing. When the cover is to be opened, pressurized gas is introduced into the ... | 09/28/1999 |
| 5927010 | Air-driven rotating window An air-driven rotating window assembly mountable to one side of a viewing window. The rotating window assembly faces toward the working or weather exposed area and slings off, by centrifugal force, any debris that contacts the rotating window so as to mai... | 07/27/1999 |
| 5623783 | Vented glass door A vented glass door includes a rectangular frame having a glass window fitted in the center thereof. At least one air passageway is provided commencing at the rear surface of the frame members, and passing through the frame members themselves and outwardl... | 04/29/1997 |
| 5520434 | Panel system with variable transparency A panel system with variable light transmissiveness is formed of two essentially parallel transparent panels, and a seal encircling both panels. A cavity, defined by the panels and the seal, communicates with a liquid reservoir, from which liquid can be c... | 05/28/1996 |
| 5282336 | Vehicle actuated fence gate The gate of this invention comprises a gate panel 10, a gate hinge mounting means 12 for mounting the gate panel to a hinge post 14 or the like, a gate latching closure means 16 mounted by the gate panel 10 for latching the gate in a closed condition to a... | 02/01/1994 |
| 5226256 | Window system for a building A window system is proposed in which windows (41) which can be both locked and tilted mechanically are connected via microprocessors (43) to a monitoring center (49) which can display the locking and closure status of the individual windows (41) via visua... | 07/13/1993 |
| 5115601 | Movable sky light The present invention presents a movable sky light assembly used on a opening of a roof comprising a fixed frame, a wing frame with a lighting member supported on the fixed frame, said fixed frame being equipped with a driving device to operate said wing ... | 05/26/1992 |
| 4514931 | Securing device for manhole cover The specification describes a pressure release device for use with a manhole cover for releasing excess fluid pressure within a manhole or the like, the device comprising a tubular member having a tubular wall, a fluid inlet at one end thereof, a fluid ou... | 05/07/1985 |
| 4351501 | Ram air enhanced relief valve A relief valve has a pair of poppet valves mounted to seal against each other when in the closed position and to uniformly move apart when opening to place one of the poppet valves outside configuration on an aircraft to create a ram air effect through th... | 09/28/1982 |
| 4180093 | Air pressure control apparatus for a hot or cold storage chamber A regulator of air pressure within a hot or cold storage chamber which comprises a damper and frames. The damper is disposed within an opening provided at a wall of the storage chamber defining an air passage, and the frames are airtightly in contact with... | 12/25/1979 |
| 4116213 | Air pressure control apparatus for a hot or cold storage chamber A regulator of air pressure within a hot or cold storage chamber which comprises a damper and frames. The damper is disposed within an opening provided at a wall of the storage chamber defining an air passage, and the frames are airtightly in contact with... | 09/26/1978 |
| 4042193 | Safety device for aircraft doors or hatches A door or hatch operating mechanism is blocked by a bolt when the aircraft moves in that dynamic pressure is sensed by a spring biased displaceable large piston moving a small piston which acts on a hydraulic link acting, in turn, on another spring biased... | 08/16/1977 |
