Thin-walled anesthesia needles are disclosed which include blunted pencil point tips and each contains a built in mechanism for directing the motion of a catheter through a side opening in the needle wall for positive location of a catheter in a patient for the delivery of required medications, or for directing the flow of directly injected medications perpendicularly to the axis of the needle.

The present invention relates to a lightweight and durable flexible-walled adsorber vessel that may be a freestanding unit, may be hung from an overhead support frame or ceiling, may float or be submersed in a body of liquid, or otherwise be suspended during use. The flexible adsorber of the present invention utilizes an internal screen, mesh, pallet or similar means to support carbon or other porous filter media so as to permit the pressurized or unpressurized removal of undesirable vapors, liq...

Certain polyether-based or polyester-based polyurethaneureas in solutions of organic solvent at a 12 to 20% concentration are particularly suited for use in a mandrel-dipping process for producing thin-walled elastic articles, such as surgical gloves, which are more resistant to puncture and tear than conventional surgical gloves made from rubber latex.

An improved double wall hose and the method of forming the hose characterized by the hose comprising a helically wound member having a center part with extensions extending in opposite directions so that when adjacent turns of the member are joined together, a plurality of cavities are formed with one of the cavities containing a helical reinforcing member. Preferably, the reinforcement is of a material harder than the material forming the rest of the member and the turns of the member when join...

A plurality of multi-walled bags of flexible plastic material is formed by taking a longitudinally folded flat web of a first flexible plastic film; at least partially separating the superposed plies of said first flexible plastic film at the edge opposite the fold line and moving the film past a corona discharge electrode between the separated plies of the film to pre-treat at least a part of the inwardly facing surface of each of said two plies; taking a longitudinally folded flat web of a sec...

A semiconductor integrated circuit device in which the side surfaces of an emitter of an oxide isolated bipolar transistor are surrounded with insulating compounds or regions so that the capacitance between the emitter and base is lowered and a base is formed by the self-alignment so that the influence of an active base between an external base and the emitter can be made negligible. Thus the base resistance and parasitic capacitance are lowered.

Transformer having an active part thereof disposed in an oil-filled, smooth-walled tank having side walls braced by ribs secured by welding and subdivided into wall-high panels, the panels, respectively, including a sheetmetal wall having a resonance frequency f.sub.o smaller according to the function f.sub.o =(S.multidot.k.sub.f)/B.sup.2 then twice line frequency, wherein S is the thickness of the sheetmetal in cm, B the net panel width in cm, and k.sub.f a constant having an absolute magnitude...

A double walled riser extends from a platform to a subsea well and is connected, through a suitable connector, to the top of the wellhead housing. The wellhead housing has annulus access passageways therein. The connector has passageways therethrough which communicate at one end with the annulus access passageways in the wellhead housing and at the other end with small diameter annulus access tubes carried between the two walls of the double walled riser. The inner wall of the double walled rise...

A double walled tank is provided for the storage of hazardous materials. The tank comprises an internal tank substantially contained inside an external tank, and substantially reduces the use of internal reinforcements between the two tanks that would disrupt the flow of fluids through the interiors of the tanks. The tank is also provided with a pair of spill boxes that surround access openings to the double walled tank and catch and contain any hazardous material that should leak or spill when ...

A double walled masonry with an interior insulating layer of mineral wool or the like and a free space between the insulating layer and outer wall for airing the masonry.