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...that after Walter Hunt patented the safety pin in 1849, he sold the rights to it for $400?
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| Number | Title | Issue Date |
| 4002881 | System for controlling electrical power in an internal wire impedance heating system An apparatus for heating fluids includes a pipe through which the fluid to be heated flows having a ferromagnetic pipe attached in heat-transmitting relationship thereto. An insulated wire extends longitudinally through the ferromagnetic pipe and is elect... | 01/11/1977 |
| 3983372 | Apparatus and method for a digital readout of distance traveled, fuel consumed and miles per gallon of a moving motor vehicle The apparatus gives a simultaneous readout of the semi-instantaneous rate of fuel consumption, expressed in terms of miles per gallon; the distance traveled; and the total amount of gallons consumed since the apparatus was last reset for a moving vehicle ... | 09/28/1976 |
| 3983360 | Means for sectionally increasing the heat output in a heat-generating pipe A heat-generating pipe is made up of a ferromagnetic pipe having an electrically insulated wire extending through the pipe to a given point so that the pipe and first wire may be electrically connected in series with an alternating current supply to gener... | 09/28/1976 |
| 3983034 | Apparatus and method of removing debris floating on a body of water A skimmer for removal of liquid and debris, such as skimming oil spills from water, comprising three pontoons, one located in each of the corners of a triangle made up of interconnecting structural members floating on a body of water. The corner pontoons ... | 09/28/1976 |
| 3975167 | Transportation of natural gas as a hydrate A method and apparatus is described for transporting a natural gas in the form of a hydrate. The method utilizes the pressure and temperature conditions of a submerged vessel to facilitate the formation and maintenance of natural gas as a hydrate during t... | 08/17/1976 |
| 3972199 | Low adhesional arctic offshore platform A method and apparatus for reducing ice forces on a marine structure erected in a body of water which becomes frozen through natural weather conditions. The structure has a low-ice-adhesional wall forming its perimetrical surface in the zone where natural... | 08/03/1976 |
| 3943775 | Method and apparatus for predicting the explosiveness of a volume containing inert gas and hydrocarbon vapors when mixed with air A method is disclosed for changing the inert gaseous content of a volume including hydrocarbon vapors to air without producing an explosive mixture. First a sample is obtained from the volume and then mixed with air to form a gas mixture. During the mixin... | 03/16/1976 |
