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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 |
| 7044732 | Rolling process cover A cover for the opening of a process tube of a furnace used in semiconductor manufacturing is comprised of a substantially continuous sheet of metal so that it may be rolled opened and closed while being against the opening of the process tube by a guide frame. The ... | 05/16/2006 |
| 6168427 | Apparatus for guiding the removal of a processing tube from a semiconductor furnace A processing chamber tube used in a semiconductor furnace is guided during its removal from the furnace by a plurality of circumferentially spaced guides. The guides are mounted for adjustable radial movement on a ring-shaped plate. The plate is secured o... | 01/02/2001 |
| 5915960 | Direct gas-fired heating and ventilation system with passive control damper A gas-fired heating and ventilation system includes a blower which draws air through a recirculation damper from a building and through a direct gas-fired burner from a fresh air inlet. A passive control damper is mounted to bypass air around the burner a... | 06/29/1999 |
| 5269370 | Thermal cycling device A thermal cycling apparatus having an upper heat chamber and a lower cold chamber positioned vertically beneath the upper heat chamber and vertically coaxial therewith whereby a material to the thermal cycle tested can be transferred between the upper hea... | 12/14/1993 |
| 5000682 | Vertical thermal processor for semiconductor wafers Semiconductor wafers within a supporting vertical wafer tower are positioned within a vertical process chamber through a lower gate valve fixed to a supporting framework. The gate valve is sealed to a similar gate valve at the upper end of a movable load ... | 03/19/1991 |
| 4664624 | Metal melting installation A metal melting installation in which a movable carrier has a kiln door fixed at its front end for closing an entrance opening of the kiln and a crucible provided forwardly of the door so as to lodge in the kiln when the entrance opening is closed. A driv... | 05/12/1987 |
| 4655978 | Method and tunnel furnace for sintering blanks Method for sintering blanks into fuel pellets, in which the blanks are moved through the muffle of a tunnel furnace by pushing the blanks through the muffle on a guiding device which goes through the muffle and protrudes therefrom at least on the input si... | 04/07/1987 |
| 4413977 | Apparatus for taking material to be treated into and out of high pressure tank An apparatus for taking a material to be treated into and out of a treating high pressure tank such as a heating sterilization tank comprises a conveyor passage interconnecting the high pressure tank and a water tank and constituted by two or more partial... | 11/08/1983 |
| 4090622 | Rotary retort furnace A rotary retort furnace wherein the retort is supported for rotation at only one end outside of the heated furnace shell such that the retort is cantilevered into the shell. The rotary retort has a charging door mechanism that cooperates with a skip hoist... | 05/23/1978 |
| 4059398 | Food oven An oven is disclosed having an inner shell forming a heatable oven chamber, a conveyor within the oven chamber, a layer of insulation around the inner shell, an exterior cabinet shell spaced outward from the insulation, and a fan for moving a flow of cool... | 11/22/1977 |
