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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 |
| 6955747 | Cam driven paddle assembly for a plating cell The present invention overcomes the drawbacks and limitations described above by providing a paddle assembly having a paddle that moves in a bidirectional fashion for agitating solution in a container of a plating cell. A follower is coupled to the paddle. The follo... | 10/18/2005 |
| 6244289 | Vent system A vent assembly for a double case, rotary positive displacement meter permits venting of the outer housing chamber and inner mechanism chamber simultaneously through a single port in the outer housing to prevent damage to the rotor of the inner mechanism.... | 06/12/2001 |
| 5440926 | Folding-unfolding rotary vane meter-motor-pump A positive displacement fluid machine comprises a body including a circular cylindrical cavity with two closed ends and two port openings respectively open to the two opposite halves of the cylindrical cavity respectively located on two opposite sides of ... | 08/15/1995 |
| 5257919 | Dual revolving vane meter-motor-pump A positive displacement fluid handling apparatus comprises a pair of cylindrical cavities with circular cylindrical walls connected to one another by a connecting flow passage and respectively open to an inlet and an outlet flow passages, wherein each of ... | 11/02/1993 |
| 5172593 | Volumetric meter for liquids and/or gases A volumetric meter for liquids and/or gases in which rolling rollers are mutually repelled magnetically to press in a sealed manner against the inner surface of the outer casing of the meter, said rollers being housed in circumferential grooves in the rot... | 12/22/1992 |
| 5131270 | Sliding rotor pump-motor-meter An apparatus for generating and/or measuring fluid flow and/or generating power from fluid flow comprises two combinations of a cylindrical cavity and a divider member rotatably disposed in the cylindrical cavity about an axis of rotation parallel and ecc... | 07/21/1992 |
| 5027654 | Volumetric meter for liquids and/or gases A volumetric meter for liquids and/or gases, in the radial cavities of the rotor of which there are housed rolling rollers which, by undergoing mutual repulsion by the action of magnets embedded in them, are urged radially into a sealed state against the ... | 07/02/1991 |
| 4836021 | Fluid flow meter A flow meter having a housing with an inlet, an outlet and a cylindrical housing chamber fluidly connected in series between the inlet and the outlet. A cylindrical rotor is rotatably mounted within the housing chamber about an axis which is eccentric wit... | 06/06/1989 |
| 4640125 | Rotary metering device useful with abrasive fluids The present invention is directed to an apparatus useful for measuring the flow of an abrasive fluid. The present invention comprises a rotary metering device particularly useful for the measurement of oil well production fluids including sand and other a... | 02/03/1987 |
| 4468964 | Liquid meter A vane-type liquid meter in which fluid input to and output from an annular measuring space are directed parallel to the rotational axis of a rotor. The fact that a separation block within the annular space is kept in place in a self-adjusting way gives t... | 09/04/1984 |
| 4272982 | Fluid flow meter for mixed liquid and gas A fluid flow meter for a fluid containing mixed liquid and gas. It has positive displacement structure that incorporates density measurement of segments of the mixed liquid and gas, while the linear velocity of both components is the same. There may be me... | 06/16/1981 |
| 4056002 | Component flow rate measurement in two-phase systems Process and apparatus for accurately measuring the volume or mass flow rate of each component phase of a two-phase mixture. In particular, mixtures of crude oil and natural gas in changing proportions and having fluctuating differential flow velocities ar... | 11/01/1977 |
