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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 |
| 4082959 | Liquid level detector In an optical detector which comprises on U-shaped transparent bar, a photoemitting diode disposed at one end of the bar and a phototransistor disposed at the other end of the bar, means for ensuring light-transmission is provided.... | 04/04/1978 |
| 4080172 | Zone refiner automatic control Disclosed is a method and apparatus for the automated growing of a floating zone refined, monocrystalline semiconductor rod. Two images of the molten/solid interface are separately positioned on two sensor arrays which, in addition to providing positionin... | 03/21/1978 |
| 4070575 | Measurement of flow of particulate material by sensing the shadow profile A portion of a beam of light directed towards a flow of particulate material is interrupted with an edge such that the edge casts a shadow across the material. The shadow profile is sensed and a signal indicative of the sensed shadow profile is derived an... | 01/24/1978 |
| 4069838 | Fiber optic liquid level sensor A liquid level sensor for use when filling containers with hydrocarbons or other liquids is disclosed. A fiber optic bundle is arranged to form a flow path for a light beam in such a manner that the flow path is interrupted when the liquid level reaches a... | 01/24/1978 |
| 4061016 | Method and apparatus for measuring the foam life on an effervescent beverage In order to measure the life of the foam of an effervescent beverage a predetermined quantity of the liquid is held in an upper vessel. This liquid is then allowed to fall rapidly into a lower vessel formed of transparent material and rotated about a vert... | 12/06/1977 |
| 4051726 | Electro-optical liquid level indicator A liquid level indicator consisting of a transparent rod within which is embedded a plurality of infrared emitters and photosensors. The infrared emitters and photosensors are mounted to a substrate which places the emitters and sensors in such a geometry... | 10/04/1977 |
| 4050853 | Rain-responsive control A small well fills with rain water and a float in the well rises to interrupt a light beam that falls on a photoelectric cell. The photoelectric cell keeps a control circuit open as long as it is exposed to the light beam and closes the control circuit in... | 09/27/1977 |
| 4045668 | Method and apparatus for immiscible liquids measurement A device for measuring the proportion of a first liquid in a lower refractive index second liquid with which the first liquid is immiscible, such as oil in water. An unclad optical fiber, having an index of refraction between those of the two liquids but ... | 08/30/1977 |
| 4039845 | Optical-electrical liquid probes An optical-electrical liquid probe for sensing the presence or absence of a liquid comprises a light emitter and a light receiver housed within a translucent hollow body. When there is no liquid adjacent a sensing part of the body, the light rays from the... | 08/02/1977 |
| 4035635 | Method of and apparatus for measurement of flow of particulate material by sensing the shadow profile A beam of light is directed at a flow of particulate material discharging from a conveyor in a curved path. The lower part of the light beam is interrupted by the material as it follows the curved path, the shadow profile being sensed to give an indicatio... | 07/12/1977 |
| 4015128 | Device for and method of controlling the level in appropriate containers of a liquid which will emit infra-red rays and, in particular, the level of molten metal A device for controlling the level in a container of a liquid which will emit infra-red rays and particularly molten metal is described. The device comprises a housing, at least one longitudinal window at one end of the housing and arranged so that when i... | 03/29/1977 |
| 4006988 | Photo-electric depth or turbidity meter for fluid suspensions An instrument functioning as either a turbidimeter or as a depth meter for measuring the distance from the instrument to the level of a turbid fluid. A light source provided with an optical system emits a beam of light to the fluid, and the volume or "bea... | 02/08/1977 |
| 3995167 | Fiberoptic fluid level sensing mechanism A fiberoptic fluid level sensing mechanism is provided which is operable for performing fluid level sensing as applied particularly to a mixing and dispensing device. The mechanism embodies light projecting means supported in the device so as to be positi... | 11/30/1976 |
| 3995168 | Electro optical fluid measurement system A device for the outside display of the level and specific density of a liquid contained within a tank, particularly for inflammable liquids, characterized by a plurality of paired light pipes having optical interface means therebetween located at interva... | 11/30/1976 |
| 3995169 | Optical liquid level gauge An optical liquid level gauge is described for sensing and indicating the height of a liquid within a container, such as within a fuel tank. The gauge includes an optical liquid probe that has a plurality of U-shaped light pipes to be inserted into a tank... | 11/30/1976 |
| 3969227 | Photoelectric inspection of transparent or translucent medicinal capsules In a capsule filling machine, capsules held pneumatically against the periphery of a transporting disc are photoelectrically inspected by two light beams, both oblique with respect to the disc axis. Electrical gating and delay circuitry effects pneumatic ... | 07/13/1976 |
| 3958129 | Automatic crystal diameter control for growth of semiconductor crystals Apparatus for automatically controlling, by stationary optical means, the diameter of a crystal from seed to final taper in a Czochralski crystal pulling method is disclosed. The diameter control has a feed back loop including diameter sensing means which... | 05/18/1976 |
| 3947692 | Digital transducers A digital transducer comprises a container having two disparate materials therein defining an interface, the interface being movable through the container responsive to a force, or forces, applied to one, or both, of the materials. A plurality of sensors ... | 03/30/1976 |
