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"The wireless music box has no imaginable commercial value. Who would pay for a message sent to nobody in particular?"
David Sarnoff, American radio pioneer ; 1921
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| Number | Title | Issue Date |
| 6996874 | Air jet for machine tool to clean cutting dust An air jet for a machine tool to clean cutting dust has a housing with a hole and an outlet. An eccentric member has a cam and is provided in the housing which the eccentric member is driven by a power resource of the machine tool for rotation. An annular transmissi... | 02/14/2006 |
| 6966934 | Gas reclaiming equipment A gas reclaiming equipment capable of separating SF6 gas from a mixed gas efficiently and shortening reclaiming work under reduced pressure. A gas separation equipment is provided between a gas insulated equipment and a gas liquefaction system. The gas se... | 11/22/2005 |
| 6666910 | Air filtration system and method of use An air filtration system for filtering air drawn into a substantially enclosed environment, such as a room, having an access opening includes a box having sidewalls, a flexible sheet of substantially air-impermeable material sized to cover the access open... | 12/23/2003 |
| 6328775 | Protection system against the penetration of contaminated air and blast waves into a protective space The invention provides a compact, portable system for protection against the penetration of contaminated air into a protected space. The system includes a gas filter and an air-intake unit. There is also a blower for sucking air through the filter into th... | 12/11/2001 |
| 4571250 | Ash container This ash receiving device is designed to prevent ash dust from entering a room when ashes from a fireplace or wood stove are dumped into the device. Primarily, the device consists of a container with a removable ash receiving receptacle on its interior. I... | 02/18/1986 |
| 4371322 | Combination air pump and air filter A two stage air filter adapted for use on an air pump as used in a motor vehicle for emission requirements, has a cylindrical, coarse filter element mounted along one end to a broadside of a thin, rigid baffle plate and a cylindrical, fine filter element ... | 02/01/1983 |
| 4306895 | Coal stacking tower dust control system An improved stacking tower is equipped with a dust pollution control system which maintains a negative pressure within the tower and comprises an exhaust means, dust collection and removal means and movable closure means for closing the discharge openings... | 12/22/1981 |
