Patents Assigned to Design Technology, Inc.
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Patent number: 5553008Abstract: A method for accurately simulating the timing and power behavior of digital MOS circuits is provided. The method includes piece-wise linear modeling of transistors, dynamic and static construction of channel connected components, event driven simulation and current measuring capabilities for power supplies, grounds, and individual resistors and transistors.Type: GrantFiled: July 10, 1995Date of Patent: September 3, 1996Assignee: EPIC Design Technology Inc.Inventors: Xiaoli Huang, William H. Zhang
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Patent number: 5446676Abstract: A method for accurately simulating the timing and power behavior of digital MOS circuits is provided. The method includes piece-wise linear modeling of transistors, dynamic and static construction of channel connected components, event driven simulation and current measuring capabilities for power supplies, grounds, and individual resistors and transistors.Type: GrantFiled: March 29, 1993Date of Patent: August 29, 1995Assignee: EPIC Design Technology Inc.Inventors: Xiaoli Huang, William H. Zhang
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Patent number: 5322571Abstract: An improved method and apparatus for cleaning liquid-carrying hoses, and the like. A suitable cleaning solvent is passed under pressure through the hose. The pressure of the solvent delivered to the hose is measured and used to control the pressure of compressed air mixed with the solvent to maintain a turbulent flow of a predetermined mix ratio for various solvent pressures. The turbulent solvent/compressed air mixture increases scrubbing of the hose to reduce the cleaning time and the quantity of solvent required to clean the hose.Type: GrantFiled: March 11, 1992Date of Patent: June 21, 1994Assignee: Plummer Design & Technologies, Inc.Inventors: Raymond G. Plummer, Mike Kosmyna, Raymond J. Foley, J. Thomas Schaffer
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Patent number: 5287867Abstract: This invention concerns a system for insuring and accurately controlling the turbulent flow of a pressurized mixture of a gas and a cleaning fluid for purging and cleaning ducts. The pressures of cleaning fluid and the gas are continuously sensed and transduced into electrical signals for controlling valves for the pressurized gas to maintain and insure its pressure at a predetermined amount relative to the pressure of said cleaning fluid, so that when the gas and fluid are mixed in a turbulator, turbulent flow is insured. The improvements of this circuit include a pressure sensor transducer for sensing the pressure of the input of the air to the turbulator and feeding it back to the main air pressure transducer for accurately maintaining a predetermined ratio between the gas and cleaning fluid pressures within less than about 1 psi in at least pressures of 150 psi. A pressure warning signal indicates when the gas and/or cleaning fluid pressure is too low to produce effective turbulent flow.Type: GrantFiled: June 8, 1992Date of Patent: February 22, 1994Assignee: Plummer Design & Technologies, Inc.Inventors: Raymond G. Plummer, Raymond J. Foley, J. Thomas Schaffer
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Patent number: 5029822Abstract: A device for adjusting and locking the inclination of the backrest of a seat, for example an aircraft seat, comprises a gas compression spring which acts between the back rest and the frame of the seat and which is of the type which has a locking and release member, which, when pressed frees the spring to expand or to be compressed and when released locks the spring in any position in which it is set to lock the back rest. The locking and release member is operated by a button fitted in an arm rest of the seat. To enable the button to operate the locking and release member entirely mechanically, the button is connected to one end of a Bowden cable through a first lever and the other end of the Bowden cable is connected to the locking and release member through a second lever. The two levers together provide a mechanical advantage of 8:1 between the force applied to the button and that acting on the locking and release member.Type: GrantFiled: September 10, 1990Date of Patent: July 9, 1991Assignee: Aero-Design Technology Inc.Inventor: Gunther Selzer
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Patent number: 4593841Abstract: A pack cart convertible for use as a cart for wheeling a load over the ground, for use as a back pack for carrying loads on the back, or for carrying loads by hand comprises a lightweight tubular cart frame having quickly removable wheels and adapted to have a pack bag secured thereon. The pack bag member may be releasably attached to the cart frame by fabric fasteners and further secured by strap members. A lightweight tubular bag frame may be carried within the bag member for maintaining the bag in a predetermined shape and allowing the bag to stand on end independently or when secured to the cart frame. The pack cart frame includes a flexible strap handle for pulling the cart behind the user and a pair of shoulder straps, one being provided with a quick release buckle for allowing the pack cart assembly to be easily installed and removed from the shoulder mounted carrying position. The wheels may be quickly removed from the cart frame and stored in the pack bag.Type: GrantFiled: February 15, 1985Date of Patent: June 10, 1986Assignee: Underwater Design Technology Inc.Inventor: Roland Lange
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Patent number: 4479753Abstract: A lift is provided characterized by its ability to be simply retrofitted into a van or similar vehicle of virtually any style construction without requiring the modification of the existing structure. The unit comes in a small, neat package which is hinged on a vertical axis to a door post adjacent the hinge of one of the doors. The mounting plate of the unit which mounts the hinge also mounts a slide in its distal end which slides in a track in the door, so that as the door is opened the mounting plate is supported at one end by its hinge and at the other end in the slide. A horizontal carrier slides outwardly on tracks on the mounting plate, so that the unit clears the vehicle structure, and then a vertical carrier descends from the horizontal carrier by virtue of a hydraulic actuator.Type: GrantFiled: May 19, 1982Date of Patent: October 30, 1984Assignee: Transportation Design & Technology, Inc.Inventor: Graham R. Thorley
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Patent number: 4441850Abstract: An auxiliary step is provided principly for use with the type of wheelchair lift that mounts to buses and other passenger vehicles wherein the risers and horizontal panels of a step structure are extended horizontally to define a platform which can be raised up and down between the levels of the sidewalk and the floor of the passenger vehicle to permit the boarding and deboarding of passengers in wheelchairs. The lift structure for which the instant invention is primarily to be used defines two steps between the floor level of the vehicle and the sidewalk or passenger platform, and the instant invention defines a third auxiliary step which can be deployed above the highest step of the platform lift.Type: GrantFiled: April 9, 1982Date of Patent: April 10, 1984Assignee: Transporation Design Technology, Inc.Inventor: Graham R. Thorley
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Patent number: 4251179Abstract: A hoisting device particularly suitable for lifting handicapped persons with or without wheelchairs, into a vehicle. The lift can be installed into the door well of a public transit bus or of a railroad car. It could also be incorporated into a step structure inside a building. The lift platform is made of four hinged, parallel sections which in the stowed position of the lift fold back to form two steps. The first parallel section which in the uppermost position of the platform meets the vehicle floor, or the upper step landing in a building, rotates along its forward edge to form the back of the upper step in the stowed position. The second section becomes the tread of the upper step while the third section forms the riser between the upper and lower step.Type: GrantFiled: May 24, 1979Date of Patent: February 17, 1981Assignee: Transportation Design & Technology, Inc.Inventor: Graham R. Thorley
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Patent number: 4176999Abstract: A lift device particularly suitable for lifting handicapped persons with or without wheelchairs, into a vehicle or building. The lift can be incorporated into the doorway of any given vehicle, or into any step structure within a building. The lift, in its stowed position, forms the normal steps. The platform is made of four hinged parallel sections which can be withdrawn and folded into two steps. The second section which forms the upper step riser in the stowed position comprises two telescopically interconnected elements, and can be expanded to provide a wider platform. The fourth section which forms the lower step riser in the stowed position can be rotated to act as an access ramp along the forward edge of the platform and flipped upward to form an angle stop preventing the wheelchair from rolling backward during platform motion.Type: GrantFiled: March 13, 1978Date of Patent: December 4, 1979Assignee: Transportation, Design & Technology, Inc.Inventor: Graham R. Thorley
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Patent number: 4081091Abstract: A lift device particularly suitable for lifting handicapped persons with or without wheelchairs, into a vehicle or building. The lift can be incorporated into the doorway of any given vehicle, or into any step structure within a building. The lift, in its stowed position, forms the normal steps. The platform is made of three hinged parallel sections which can be withdrawn and folded into two steps. A ramp normally hidden under the steps slides forward to allow easy access to the extended platform and a safety flap housed in the ramp flips upward to form an angle stop preventing the wheelchair from rolling backward during platform motion.Type: GrantFiled: February 17, 1977Date of Patent: March 28, 1978Assignee: Transportation Design & Technology, Inc.Inventor: Graham Roy Thorley