Famous Patents
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 |
| 4331222 | Method for reducing brake noise in oil-immersed disc brakes Lubricating oils containing oil soluble C8 -C28 alkane-1,2-diols have been found to reduce brake noise for oil-immersed disc brakes.... | 05/25/1982 |
| 4290511 | Load-carrying strut construction A load-carrying, shock absorbing strut is provided comprising an outer tube for carrying a wheel axle journal. There is slidably accommodated in the tube a shock absorber cylinder which is connected with the chassis frame. A downwardly emerging piston rod... | 09/22/1981 |
| 4287978 | Annular friction disc with radial grooving An annular friction disc has a flat friction surface on each side of a flat steel plate with each friction surface having a plurality of radially extending grooves formed therein. Each groove has a flat bottom portion which extends between the inner and o... | 09/08/1981 |
| 4212345 | Device for forming holes in a foundry sand mold A device for forming a sprue or vent hole in a foundry sand mold. The device includes a body having a central bore and having an air outlet in the upper end of the body communicating with the bore. An axial opening in the lower end of the body has a small... | 07/15/1980 |
| 4175647 | Hydrodynamic retarder for vehicles, especially for motor vehicles A hydrodynamic retarder for vehicles, especially for motor vehicles, with an internal working circulation within a working space having at least one rotating blade wheel and at least one stationary blade wheel, with an external cooling circulation that ca... | 11/27/1979 |
| 4164994 | Hydraulic eddy brake A hydraulic eddy brake has a rotor and a stator both forming an eddy chamber. Liquid supply conduits lead to the center of the eddy chamber. The rotor shaft is sealed relative to the housing formed by the stator. The sealing is accomplished by noncontacti... | 08/21/1979 |
| 4061207 | Modulating arrangement for servo-motor actuated disc brake Pressurized oil is delivered into the space containing the friction surfaces of a servo-motor actuated disc brake, such delivery being momentary and in response to the delivery of pressurized fluid to the servo-motor itself. Such oil into the space serves... | 12/06/1977 |
| 4023656 | Wet type band brake apparatus A wet type band apparatus characterized by the construction that, in the wet type band brake apparatus provided on the outer periphery of the brake drum with the lining fixed on the inner periphery of the brake band, a groove is cut on the contact surface... | 05/17/1977 |
| 3987873 | Brake mechanism A brake mechanism, applicable to the braking of trailer vehicles, has an electro-magnetic arrangement which is disposed between the inner ends of coaxial wheel supporting shaft units to selectively and individually control the rotation thereof. Each shaft... | 10/26/1976 |
| 3951242 | Hydraulic brake for heavy vehicles A non-exhaustable permanent brake for a vehicle motor, which includes a fluid operable braking unit arranged in the housing of the vehicle motor and comprising a pump wheel which is drivingly connected to the crankshaft of the motor and is interposed in a... | 04/20/1976 |
