A pulsed combustor comprising at least one aerodynamic diode, a diffuser, fuel injectors, combustion chamber/duct, igniters, and muffler providing plug type flow with successive ignition and wave generation at the hot gas interface of the previous pulse. The downstream wave of each pulse propagates through the muffler whereas the upstream wave of each such pulse is at least partially reflected downstream with the diode(s) and diffuser minimizing reverse flow and maximizing pressure gain in the c...

To permit smaller cross section of thermal lances, in which a plurality of core wires are inserted in a jacket tube with space between the core wires and the jacket tube for the supply of oxygen, the relative dimensions of the elements of the lance are selected as follows: The outer diameter of the jacket tube is between 3 mm and 10 mm; 8 to 16 core wires are used; the ratio of the diameter of the space to form a duct for oxygen to the overall diameter of material is between 1 : 4 to 1 : 10; the...

A coupling piece for carrying out digital transmissions between an electrical interface of a first device and an electrical interface of a second device. The devices each use different voltage levels for distinguishing between the two logical states "high" and "low". An internal circuit is provided for converting the voltage levels of the first device to the voltage levels of the second device, which correspond to the state. The higher voltage level is conveyed to this internal circuit by one of...

The present invention is a pipe heater that uses a combustible gas burner to provide heat to the pipe. The gas burner permits the heater to be portable and to be used in remote locations where a source of electricity is not readily available. The heater comprises a body adapted so that a pipe can extend therethrough and a burner to bend the pipe. Positioned between the burner and the pipe within the heater is a baffle having a plurality of holes therein. The baffle redirects the heat from the bu...

A helmet for emergency fire use fitted with air supply means supported at the forward section of the helmet that is led to the user through a mouthpiece from a container of pressurized air. The mouthpiece, when gripped by the user, for breathing purposes, serves as a structural support of the worn helmet.

A supplied air respirator system is described for use in an enclosed work area wherein an asbestos abatement action is being conducted. A conventional air filtration unit is provided and which has its discharge side in communication with a clean air box. Positioned within the clean air box is a HEPA filter intake box having a HEPA filter contained therein with the discharge side thereof being connected to one or more air pumps. The discharge side of each of the air pumps is connected to an air c...

In a plasma processing method, a plasma is generated using a process gas, and an electron beam is injected into the plasma to control an electron energy distribution in the plasma. Then, a semiconductor substrate is processed using the plasma with controlled electron energy distribution.

A supplied air snorkeling device is provided. This device includes a flotation vest coupled with a tank holder. This flotation vest contains flotation material that cannot be deflated and substantially prohibits a user from submerging. A tank cover is positioned within the tank holder for holding an air tank. Still further, a hose retainer is coupled with the vest. In use, an air tank is placed within the tank cover which is then placed within the tank holder. A hose extends from the air tank th...

A squeegee with a pump supplied sponge comprising a handle having a hollow interior, the handle having an inboard region, an outboard region, an upper surface and a lower surface, the interior of the outboard region including a reservoir for the retainment of fluid, the reservoir having a fill spout to permit the receipt of fluid, the inboard region having a fluid pump positioned therein, a trigger formed in a cylindrical configuration being operatively coupled to the pump, the user depressing t...

The specification discloses a supplied air respirator system for delivering air to a painter who is using a compressed air line leading to a hand-held paint spray unit. A supply tap is located in the compressed air line for removing a supply of compressed air for delivery to the painter. The tap is located in the compressed air line proximate to the hand-held paint spray unit and is configured to be oriented generally vertically above the air line so that the tendency of particles to be drawn in...