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Sir William Preece, chief engineer, British Post Office ; 1878
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| Number | Title | Issue Date |
| 7287268 | Video-on-demand system which builds transmission control lists and uses such lists to send video data packets with respective subgroups of internet protocol headers A video-on-demand system is comprised of a supervisor processor and a co-processor which are intercoupled via a bus. The supervisor processor has a supervisor memory and the co-processor has a co-processor memory. A supervisor control program is in the supervisor me... | 10/23/2007 |
| 7066106 | Reverberating mechanical siren A small light mechanical siren for mobile emergency equipment which utilize spiral rebound ramps in the rotor to produce a loud penetrating square form spiral sound wave, enabling effective warning without contributing to noise pollution. ... | 06/27/2006 |
| 6810992 | Sound producing vehicle exhaust system A sound producing vehicle exhaust system comprises a housing positionable over an exterior end of a vehicle tailpipe. A turbine has at least one support plate. The support plate is rotatable about a central axis of rotation with the housing and has a plurality of an... | 11/02/2004 |
| 6578511 | Pneumatic signaling device for divers The present invention relates to an all-purpose, pneumatic powered signaling device including a first component capable of transmitting signals above water and a second component capable of transmitting a signal beneath the water. The first component incl... | 06/17/2003 |
| 6294984 | Air horn assembly An electro-pneumatic air-horn assembly comprises a horn assembly, an electrically powered air-compressor assembly, a mounting bracket, and a rigid metal conduit. The horn assembly includes an elongated trumpet. The air-compressor assembly is adapted to pr... | 09/25/2001 |
| 5335655 | Suction control valve A suction control valve is disclosed which includes a primary suction device access and an ancillary suction device access. The valve includes an actuator which is movable between a first position in which the primary access is closed against suction pres... | 08/09/1994 |
| 4554531 | Omnidirectional siren The stator of the sound generator in the siren of this invention is mounted on struts that diverge upwardly from the top of an upright post, with its axis coinciding with that of the post. The coaxial rotor of the sound generator is driven by a motor moun... | 11/19/1985 |
| 4336857 | Vehicle speed-control system and actuator device A motor vehicle speed-control system includes a bellows chamber having a movable wall connected to the engine throttle. The pressure of the gas in the chamber is controlled by two electromagnetic valves, the first electromagnetic valve being energized wit... | 06/29/1982 |
| 4215646 | Low pressure differential detecting whistle A whistle audibly responsive to extremely small pressure differentials is described. The whistle has a cylindrical inlet portion, a cylindrical outlet portion and a cylindrical constriction that form a passageway between said inlet and outlet portions. Th... | 08/05/1980 |
