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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.
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| Number | Title | Issue Date |
| 4863142 | Electromagnetic solenoid valve with variable force motor A solenoid valve which includes a valve body having a central bore from which fluid passages radially extend. A valve spool is axially slidably captured within the valve body bore to control passage of fluid among the valve body passages. An electromagnet... | 09/05/1989 |
| 4753263 | Electrohydraulic regulating valves A pressure regulating valve which will give a constant pressure output comprises a housing of soft magnetic material such as low carbon steel, an armature of soft magnetic carbon steel in the housing and having an outlet exhaust passageway therethrough pr... | 06/28/1988 |
| 4674536 | Electrohydraulic valves for use in a system Electrohydraulic valves for use in high fluid pressure systems such as automotive anti-skid brake systems, power steering systems and machine tool systems comprising a valve body of magnetic material, a valve seat member of magnetic material having a non-... | 06/23/1987 |
| 4617968 | Electrohydraulic control of a spool valve for energizing a heavy duty automatic transmission clutch An electrohydraulic control system comprising a spool valve including a body having a bore. A spool is positioned in the bore for reciprocating movement within the bore. The valve body has an inlet, an outlet and an exhaust port. An electrohydraulic three... | 10/21/1986 |
| 4595035 | Solenoid valve A pulse width modulated valve comprising a valve housing including a transverse wall, an extension extending axially from the transverse wall and a peripheral wall extending axially from the periphery of the transverse wall in a direction opposite to the ... | 06/17/1986 |
| 4570904 | Solenoid valve A pulse width modulated solenoid valve having a housing and includes a pole member including a pole piece extending axially inwardly of the housing, and a transverse wall extending radially outwardly into engagement with a peripheral wall. The pole piece ... | 02/18/1986 |
| 4556085 | Solenoid valve A solenoid valve comprising a housing including a first transverse wall, a first axial extension extending from the transverse wall, and an integral peripheral wall extending axially in the opposite direction from the periphery of the transverse wall. A c... | 12/03/1985 |
| 4553421 | Ring compressor tool This invention relates to a tool for uniformly compressing a non-resilient metal ring to a smaller diameter which comprises an outer hollow receiver provided with a handle for manually holding the receiver against turning, a threaded shaft in the receiver... | 11/19/1985 |
| 4509340 | Accumulator-dehydrator assembly for an air conditioning system An accumulator-dehydrator assembly for an air conditioning system comprising an accumulator housing defining an enclosed chamber including an inlet and an outlet in the upper end and a refrigerant and oil accumulator in the lower end, and a vapor drier ca... | 04/09/1985 |
| 4472861 | Mounting arrangement for plastic workpieces A mounting arrangement for clamping plastic workpieces such as replacement engine and transmission covers in the automotive aftermarket. The mounting arrangement includes a metal eyelet crimped over an annular bead on the workpiece and having a flat centr... | 09/25/1984 |
| 4450081 | Transmission fluid filter and method of manufacture An improved transmission fluid filter and a method of assembly wherein the filter comprises a plastic first member having a planar peripheral lip, and a sheet metal second member with a planar ledge and a continuous peripheral flange crimped over the cove... | 05/22/1984 |
| 4417383 | Method of assembling pipe joint In an oil pump inlet screen assembly adapted to be immersed in an oil sump and comprising a filter screen including a housing and a lift pipe adapted to be inserted at one end into an oil pump opening, the improvement wherein the housing and lift pipe are... | 11/29/1983 |
| 4402827 | Transmission fluid filter In the fluid circulation system of a transmission having a prespecified minimum operating temperature and a minimum fluid flow requirement for operation at the minimum operating temperature, a transmission fluid filter comprising a housing having a fluid ... | 09/06/1983 |
| 4361120 | Roller tappet and method of making same A roller tappet includes a body defining an elongated recess opening through the lower end thereof. A roller is rotatably mounted within the recess. The recess is dimensioned to substantially encircle and enclose said roller. The tappet body is cast from ... | 11/30/1982 |
| 4351550 | Metal-to-plastic pipe joint In an oil pump inlet screen assembly adapted to be immersed in an oil pump and comprising a filter screen including a housing and a lift pipe adapted to be inserted at one end into an oil pump opening, the improvement wherein the housing and lift pipe are... | 09/28/1982 |
| 4264443 | Transmission fluid filter A transmission fluid filter comprising a metal base pan and a filter frame of thermoplastic construction which supports a filter medium in spaced relation to the base pan. Axially aligned openings in the frame and base pan received bolts for mounting the ... | 04/28/1981 |
| 4256318 | Piston ring A parted annular piston ring having an outer periphery for engaging a cylinder wall of an internal combustion engine. A band of hard, wear-resistant material is secured in a groove which extends circumferentially completely around the outer periphery. The... | 03/17/1981 |
| 4247972 | Method of manufacturing a piston ring A parted annular piston sealing ring and a method for manufacture thereof wherein an inwardly facing ring surface adapted to be engaged by an expander-spring for expanding the ring into sealing engagement with a cylinder wall is hardened in a zone immedia... | 02/03/1981 |
| 4224161 | Oil pump inlet screen assembly In an oil pump inlet screen assembly adapted to be immersed in an oil sump and comprising a filter screen including a housing and a lift pipe adapted to be inserted at one end into an oil pump opening, the improvement wherein the housing and lift pipe are... | 09/23/1980 |
| 4214781 | Pipe joint and method of assembly A pipe joint specifically adapted for an oil lamp inlet screen, and a method of assembly therefor, comprising a metal pipe adapted at one end to be connected to an oil pump housing and a filter screen including a molded plastic screen housing having an ap... | 07/29/1980 |
| 4204688 | Oil control ring spacer-expander with improved slip latch In a parted corrugated spacer-expander for use in a piston oil control ring of the type which includes a circumferential series of alternating inner and outer crowns successively connected by radially diverging spring legs having oil drain openings formed... | 05/27/1980 |
| 4161321 | Piston ring and method of manufacture A parted annular piston sealing ring and a method for manufacture thereof wherein an inwardly facing ring surface adapted to be engaged by an expander-spring for expanding the ring into sealing engagement with a cylinder wall is hardened in a zone immedia... | 07/17/1979 |
| 4136011 | Transmission fluid filter and method for manufacture thereof A transmission fluid filter having a fluid outlet comprising a sheet metal base member with a plurality of upstanding spaced support bosses. A polyester fiber mesh is molded into a plastic filter frame which includes a peripheral edge for attachment to th... | 01/23/1979 |
| 4129503 | Oil pump inlet screen assembly A pipe joint specifically adapted for an oil pump inlet screen, and a method of assembly therefor, comprising a metal pipe adapted at one end to be connected to an oil pump housing and a filter screen including a molded plastic screen housing having an ap... | 12/12/1978 |
| 4111437 | Oil control ring spacer-expander with improved slip latch In a parted spacer-expander for a piston oil control ring of the type which includes an array of alternating inner and outer crowns connected by generally diverging spring legs and a support pad extending radially from each inner crown and connected there... | 09/05/1978 |
| 4059278 | Piston ring spacer-expander with overlap-preventing expander joint In a parted corrugated spacer-expander for a piston oil control ring, an improved expander end joint for preventing installation of the expander should overlap occur between the expander ends in which the respective expander ends are each formed in a mult... | 11/22/1977 |
| 4053164 | Spacer-expander for a piston oil control ring In a spacer-expander for a piston oil control ring of the type which includes a circumferential series of alternating inner and outer crowns successively connected by radially diverging spring legs and a support pad extending radially outwardly from each ... | 10/11/1977 |
| 4045036 | Piston oil control ring In a composite oil control ring for reciprocating piston internal combustion engines which includes a relatively soft parted cast iron ring and an expander-spring disposed internally of the ring to bias the same into sealing engagement with a cylinder wal... | 08/30/1977 |
| 4009696 | Hydraulic lash adjuster with internal oil pressure control A hydraulic lash adjuster for use with an internal combustion engine having an overhead cam, includes a stationary body received within a cylinder head bore and a plunger reciprocal within the body. The plunger includes a central cavity defining an oil re... | 03/01/1977 |
| 3998572 | Spacer-spring for rotary piston engines An oil seal for rotary piston internal combustion engines, and method of making the same, comprising a spacer-spring disposed in a circular groove in the rotary piston end face, and a pair of annular oil scraping rails radially spaced from each other with... | 12/21/1976 |
| 3977370 | Roller tappet One end of the hollow valve lifter body is bifurcated forming two spaced supports. A roller is rotatably supported between the supports by a shaft and the circumferential edge rotates in a recess in the body end formed by plunge milling the wall portions ... | 08/31/1976 |
| 3967359 | Loading device for installation of rotary engine oil sealing rings A loading device for installation of rotary engine oil sealing rings into paired concentric circular grooves in a rotor end face comprising an annular sleeve having an inside diameter equal to the outside diameter of the radially inner groove and an outsi... | 07/06/1976 |
