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...When G.G. Hubbard learned of his future son-in-law's invention, he called it "only a toy." His daughter was engaged to a young man named Alexander Graham Bell.
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| Number | Title | Issue Date |
| 4671324 | Jack bolt assembly A jack bolt assembly for separating joined first and second flange members of a flange assembly including a longitudinally extending, generally rod-shaped jack bolt member adapted to extend between first and second flange members of the flange assembly an... | 06/09/1987 |
| 4655241 | Apparatus for sealing dampers An apparatus for sealing a flow control apparatus, such as a guillotine damper, is disclosed. The apparatus of the invention is particularly intended for dampers or other flow control devices utilizing pressurized sealing air to effect complete sealing. T... | 04/07/1987 |
| 4582296 | Composite blade for dampers for ducts of large cross sectional areas A damper for ducts of large cross sectional areas has an upstream seat surrounding the flow path and a blade which consists of upstream and downstream skins of a high quality nickel allow steel and an internal reinforcement. The thickness of the skins is ... | 04/15/1986 |
| 4561472 | Sliding blade closure apparatus with inflatable sealing ring A conduit closure apparatus, e.g., a damper, comprising a frame adapted for connection to a conduit in a position generally in registry with the conduit, a movable blade slidably mounted in the frame, means for moving the blade back and forth between an o... | 12/31/1985 |
| 4510959 | Method for installation of an extended header A header or other pipe under pressure which is blanked at its terminal end by a closure plate is extended without the need of a shutdown or the construction of bypass piping. In a series of steps in the method disclosed, alternate bolts in the ring of bol... | 04/16/1985 |
| 4503594 | Method for fabricating an orifice fitting for a gas pressure differential-measuring system An orifice fitting for a gas pressure differential-measuring system is constructed of a fabricated body. In the fabrication, two lengths of flared or flanged pipe are inserted through the internal bores of respective orifice blocks and circumferentially w... | 03/12/1985 |
| 4491144 | Flexible seals for sliding blade dampers A sliding blade damper is provided with an improved seal arrangement around the blade withdrawal aperture. Two pairs of flexible sealing strips are used, mounted on either side of the aperture and pressing against the opposite sides of the blade. The unat... | 01/01/1985 |
| 4478251 | Orifice fitting seal assembly An orifice fitting seal assembly is provided for use in an orifice fitting having a body structure defining a flow passage and opposed spaced sealing surfaces surrounding the flow passage. The improvement comprises a pair of internal seal rings of symmetr... | 10/23/1984 |
| 4474205 | Sliding blade apparatus for closing conduits A conduit closure apparatus comprising a main frame adapted for connection to a conduit in a position generally in registry with the conduit, a movable blade slidably mounted in the frame, means for moving the blade back and forth between an open position... | 10/02/1984 |
| 4452278 | Spectacle line blind with vent A spectacle line blind includes a pivotable or rotatable spectacle plate having at one end a conventional full opening providing little obstruction to flow of liquid or gas. On the other end of the spectacle valve plate a blank disc seals one of said inle... | 06/05/1984 |
| 4399708 | Orifice meter with rotatable isolation sealing member An orifice meter having a working housing with flow tubes and an isolation chamber for servicing the orifice. An annular member in the working housing isolated into one position to align an access opening with the isolation chamber to enable movement of a... | 08/23/1983 |
| 4394826 | Orifice meter with isolation valve on the carrier An orifice meter with an isolation valve plate pivotally suspended from the bottom of the orifice disc carrier. The valve plate is eccentrically mounted so that it drops to horizontal position when the carrier is raised free of the flow passage sealing su... | 07/26/1983 |
| 4394895 | Facilities for the examination of radioactive bodies A facility for the examination of radioactive bodies in which carriages, each transporting one or more radioactive bodies, travel along a shielded passage to bring the bodies to examination stations spaced along the passage. The transverse sectional dimen... | 07/26/1983 |
| 4343332 | Line blind A line blind includes seal rings on either side of a spectacle plate interposed in a pipe, and a special camming arrangement including two cooperating sets of longitudinally directed sloping teeth circularly arranged which operate on slight rotational mov... | 08/10/1982 |
| 4334550 | Sealing means for sliding gate valve A gate valve apparatus suitable for controlling the flow of fluids in a conduit, especially gases in high temperature applications, is disclosed. The apparatus includes a gate member adapted for sliding movement through an aperture in the gate valve assem... | 06/15/1982 |
| 4312704 | Shut-off device blocking spontaneous passage of spherical bulk material especially in quick emptying pipes of pebble bed reactors Grill gates respectively formed by oppositely moving, interfitting rod combs with gaps between the rods which are smaller than the particle diameter are so arranged so that each comb may be individually moved to the open position and shut again without al... | 01/26/1982 |
| 4271870 | Method and apparatus for blocking the flow of fluids through an elongated pipe section A method and apparatus are disclosed for blocking the flow of fluids through the interior of an elongated pipe section. The apparatus includes a pair of sectional housing members for interconnection around a flanged pipe joint to form an essentially airti... | 06/09/1981 |
| 4257447 | Gate valve A packingless gate valve comprises a housing having two opposed resilient sleeve units that compressibly engage end to end in valve open condition and engage opposite sides of the gate in valve closed condition. Each sleeve unit is a resilient annular bod... | 03/24/1981 |
| 4235256 | Damper assembly for gas duct A damper assembly for closure of a duct for conveying hot corrosive gases is disclosed. The damper assembly comprises a rectangular frame having vertical side members substantially coextensive with and secured to sides of the duct and extending both above... | 11/25/1980 |
| 4194721 | Plumbing test fitting A plumbing test fitting for waste or vent pipes and stacks extending between adjacent floors of a building having a closure plate adapted to be slidably fitted between a pair of spaced adjacent ends of a pair of pipes, the joint being sealed by a detachab... | 03/25/1980 |
| 4179038 | Self-sealing flange and method of installation thereof A self-sealing flange assembly includes an elliptical shaped hole in a blind wall, the greatest diameter of which is larger than the smallest diameter of an elliptical shaped inner flange. Attached at a right angle to the surface of the flange is an inter... | 12/18/1979 |
| 4119115 | Stopping fluid flow in pipes An apparatus for cutting into and stopping the flow of fluid in a plastic pipe including a cutting blade that is forced downwardly into a pipe by a hydraulic force. The blade is slightly larger than the internal diameter of the pipe and thus when located ... | 10/10/1978 |
| 4088146 | Apparatus and method for sealing dampers An apparatus and method for sealing a flow control apparatus, such as a damper, suitable for controlling the flow of fluids in a conduit, especially high temperature gases in flue ducts. The damper includes a closure member which may be removed entirely f... | 05/09/1978 |
| 4043534 | Sealing means for sliding gate valve Sealing means for a sliding gate valve with a frame having a bottom frame member, a top frame member with an aperture therein generally transverse to the direction of fluid flow through the valve, and parallel, rectilinear side frame members and a gate ha... | 08/23/1977 |
| 4036260 | Gate valve with expandable and contractable closure member A valve comprising: a housing having an opening therethrough around which is provided a seat; a closure assembly for blocking flow through the opening and for sealing engagement with the seat; and an actuator assembly connected to the closure assembly for... | 07/19/1977 |
| 4022241 | Damper sealing structure A mount for a damper which is inserted between duct sections. An assembly of bent plate spring duct seal members forms a seal assembly mounted on each duct section at adjacent ends of the duct sections. The damper plate advances between the seal assemblie... | 05/10/1977 |
| 4018420 | Slide valve for closing a large pressurized gas conveying pipe A housing, connectable to a pipe, has therein an opening, a chamber, a stationary sealing seat, and a movable sealing seat displaceable toward and away from the stationary sealing seat. A slide plate is movable from an open position, exterior of the housi... | 04/19/1977 |
| 4014366 | Orifice fitting conversion apparatus The present invention provides an apparatus for converting an orifice fitting for an orifice plate, of the type known as a "simplex" or "semi" orifice fitting, in a pipeline so that the orifice plate in the orifice fitting may be replaced or removed while... | 03/29/1977 |
| 4007911 | Packingless gate valve and actuator assemblies A packingless gate valve actuator assembly having a stepped through passage defined by respective half housings formed with passages of different diameter and respective bolt connector flanges disposed in face to face relation with spacer strips interpose... | 02/15/1977 |
| 3934813 | Concrete pump valve A valve for a concrete pump having a front valve closing portion which in the closed position prevents flow through a T-pipe section, a supporting structure secured to the T-pipe section and an annular sealing band carried by the supporting structure and ... | 01/27/1976 |
