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"That’s an amazing invention, but who would ever want to use one of them?"
President Rutherford B. Hayes ; Said in 1876, after Alexander Graham Bell demonstrated the telephone to him at the White House
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| Number | Title | Issue Date |
| 4475571 | Sewer relief valve An improved sewer relief valve which is vandal-proof and automatically opens responsive to a back flow of sewage and drain water within a plumbing system.... | 10/09/1984 |
| 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 |
| 4474209 | Solar heating check valve and flow indicator Disclosed is a pair of check valves for a home solar heating apparatus, one check valve for the solar collector supply line and one for the return line. The check valves have a transparent portion and an impeller which rotates during water flow and is loc... | 10/02/1984 |
| 4453569 | Check valve with inspection means A check valve incorporating inspection valve means therein for disclosing the presence or absence of fluid on the "upstream" side of the valve.... | 06/12/1984 |
| 4437482 | Water-sensitive probe valve for use with a gas leak detector A water sensitive cutoff valve shuts off upon detecting water to protect a gas leak detector. A transparent case threads into a base and houses a normally open valve mechanism. The valve includes a tapered post with an exit port and a shuttle that is capa... | 03/20/1984 |
| 4406303 | Gate valve with position indicator The invention relates to a gate valve (10) having both visual and electrical position indicating means for signalling when the valve is in the fully open and fully closed conditions. A position indicator housing (50) on the valve body (11) receives and ac... | 09/27/1983 |
| 4376447 | Hot water valve A valve comprising a body having a chamber therein, fluid inlet and outlet ports in communication with the chamber, an opening for a valve plunger, and a nipple extending into the chamber having a passage constituting one of said ports. A valve plunger ex... | 03/15/1983 |
| 4343326 | Apparatus for dispensing a liquid additive An apparatus is provided for dispensing a liquid additive to the surface of a receding liquid in a pressurized vessel, particularly for automatically dispensing a liquid oil spreading agent to the surface of ballast water contained in a pressurized tank o... | 08/10/1982 |
| 4327760 | Non-interrupting gas meter exchange system A method and apparatus for exchanging a gas meter without interrupting customer service. The apparatus preferably comprises a rigid frame for temporarily securing a meter to be exchanged independently of its mounting nuts, and an isolating enclosure adapt... | 05/04/1982 |
| 4304257 | Valve with flexible sheet member A valve that is particularly useful in biological fluid handling systems includes a body member that has a firm and stable support surface and a flexible sheet member that has a surface for conforming and mating engagement with the surface of the valve bo... | 12/08/1981 |
| 4273152 | Control valve assembly with onstream seal removal feature A control valve assembly for controlling fluid flow in a flowline with an onstream seal removal feature, the control valve assembly including a housing to be mounted with the flowline, flow control members mounted with the housing, seal members for preven... | 06/16/1981 |
| 4269211 | Steam manifold distribution system for providing equal quality of steam in two lines A method for equalizing the steam quality in a plurality of branch lines of a high pressure steam pipeline, as a tee joint comprises dividing the flow of steam entering the tee joint into the two branch lines with a perforated baffle plate rotatable in re... | 05/26/1981 |
| 4245749 | Safety device A safety device for a pressure vessel having an opening therein in which is positioned an upstanding base secured around the vessel opening with a frangible diaphragm covering the opening. A protective cap covers the base with the frangible diaphragm and ... | 01/20/1981 |
| 4244393 | Shut-off valve The present invention concerns a shut-off valve comprising a valve body with at least two flow ports, two shutters and a turning shaft. Said shutters are placed opposite each other on an annular spring which forms the lower part of the turning shaft and b... | 01/13/1981 |
| 4210174 | Positive pressure valves A positive pressure valve is provided having a valve member with a central magnetically attracted member spaced from and coaxial with a rod like magnet, said valve member and magnet being relatively movable to adjust the magnetic attraction between them a... | 07/01/1980 |
| 4184509 | Vacuum relief and access door assembly A vacuum relief and access door assembly, for use on a duct downstream of a fire or control dampers, comprises a frame including a duct facing surface with a seal member thereon, a closure member having side edges in sealing engagement with the seal membe... | 01/22/1980 |
| 4176683 | Flow regulator A presettable fluid flow regulator having a body in the form of an elongated sleeve of flexible material and a core within the sleeve having a recess of varying cross section on its outer surface along its length. A ring on the outside of the sleeve havin... | 12/04/1979 |
| 4140149 | Plug cock Plug cock equipped with a rotating plug, which comprises a cylindrical body pivoting about an axis perpendicular to the axis of the cylinder and through which passes a conduit for the passage of fluid, which body comprises, at least one of its two axial e... | 02/20/1979 |
| 4140151 | Vacuum relief door assembly A vacuum relief and access door assembly, for use on a duct downstream of a fire or control dampers, comprises a frame including a duct facing surface with a seal member thereon, a closure member having side edges in sealing engagement with the seal membe... | 02/20/1979 |
| 4137048 | Insulating foam producing and delivering apparatus, and foam gun therefor Insulating foam producing and delivering apparatus includes foaming agent and resin supplies, means for delivering the foaming agent and resin and also air under pressure and a foam gun for generating the foam and mixing the foam with the resin. The foam ... | 01/30/1979 |
| 4131131 | Valve construction A gate valve construction is provided and comprises, a valve body having an inlet and a discharge orifice, a flexible gate for the discharge orifice, and a mechanism for supporting and moving the gate in front of and away from the orifice with the gate be... | 12/26/1978 |
| 4114635 | Method of monitoring ratio of flowing mixture A solution dispensing proportioner utilizing a varyingly pressurized solvent and a solute having a vagrant negative gauge pressure and a tracer that is detectable in proportion to its concentration. The proportioner aspirates the solute and tracer through... | 09/19/1978 |
| 4108205 | Valve arrangement A valve arrangement for amplifying the effect of the application or removal of atmospheric pressure upon a fluid pressure responsive actuator element such as a pneumatic cylinder or bellows comprising superposed chambers one connected to the atmosphere an... | 08/22/1978 |
| 4086937 | Dual hose A unitary supply means for two separate liquids comprising a flexible supply hose unit defining at least two conduits generally of different sizes, one of which preferably is transparent, having an integral common wall reinforcement of extra thickness bet... | 05/02/1978 |
| 4070903 | Outflow meter for measuring surface drainage characteristics An outflow meter for measuring the drainage characteristics of a surface comprising a disc having a surface engaging face which is disposed in contact with the surface during use of the meter, an orifice extending through the disc and terminating at the s... | 01/31/1978 |
| 4070161 | Double seal gate valve structure A gate valve structure is shown embodying an elongate slide member movable within an elongate housing. The slide member carries a pair of annular seals spaced apart along the length of a valve body and has a bore therein extending through the valve body a... | 01/24/1978 |
| 4022421 | Delayed release valve for a fire hydrant The invention is a delayed release valve for a fire hydrant which permits the fireman to couple a fire hose with the valve in place to a fire hydrant, the valve being released subsequent to the coupling operation either by a timer which is set at the time... | 05/10/1977 |
| 4022245 | Sight check valve A swing type check valve is connected by a double compression coupling to an irrigation pipe. The compression sleeve over the valve is transparent so that the valve may be sight checked or visually inspected.... | 05/10/1977 |
| 3974857 | Device for monitoring and adjusting the temperature of multiple cooling circuits A device for monitoring and adjusting the temperature of multiple cooling circuits in which a monitoring unit with a float-type flow gauge, a temperature gauge and a throttle valve is associated with each cooling circuit, and several units are assembled i... | 08/17/1976 |
| 3974856 | Distributor panel or board for compressed air monitoring systems A distributor board or panel for compressed air monitoring systems including an integral die-cast distributor housing and a plurality of flow detectors. The housing has a longitudinal opening and surrounding structure to which the flow detectors are mount... | 08/17/1976 |
| 3938550 | Continuous flow ratio monitor A solution dispensing proportioner utilizing a varyingly pressurized solvent and a solute having a vagrant negative gauge pressure and a tracer that is detectable in proportion to its concentration. The proportioner aspirates the solute and tracer through... | 02/17/1976 |
