Other

Bayer Aktiengesellschaft

Hans Muller

Hermann Suerbaum

Kuno Wagner

Klaus Konig

Pramod Gupta

Harro Traubel

Lothar Preis

Gerhard Henes

Alfred Nierth

Joachim Zirner

Bruno Zorn

In an apparatus for the extra-corporal treatment of blood wherein blood is supplied from a body to a vacuum bottle via a conduit and an insertion spike, the insertion spike is in communication, by way of a gas hose, with a pressure compensation bag from which a predetermined amount of gas can be supplied to the insertion spike for foaming the blood in the vacuum bottle, whereby no excess pressure can be generated in the vacuum bottle. The blood conduit further includes a quartz glass portion to permit UV irradiation of the blood while passing therethrough.

Apparatus for treating blood

For an apparatus for the extra-corporal treatment of blood wherein blood is supplied from a body to a vacuum bottle via a conduit, an insertion spike for piercing a closure plug of a vacuum bottle has a front end with a pointed tip and includes a first passage extending from the front end to a connecting piece for connection to a gas supply means, the front end having a perforated side wall for the diffused discharge of gases admitted through the first passage and a second passage having means for connection to a blood conduit and extending to an opening in the side of the insertion spike adjacent the perforated side wall.

In an apparatus for the irradiation of body fluids by ultraviolet light in a containment for receiving the body fluids which is disposed in the radiation range of an ultraviolet light source, the containment includes baffle means arranged so as to subject the body fluids circulated through the containment to turbulence whereby the body fluid in the containment is uniformly exposed to the UV radiation.

Apparatus for the irradiation of body fluids by ultraviolet light

An invertible tubular substrate of resin-permeated fibrous material is surrounded by an impermeable tubular film which, in turn, is surrounded by an impermeable tubular calibrating element. One end of the substrate is inserted into one end of a pipe which is to be lined from the inside, and the assembly of substrate, film and calibrating element is thereupon inverted into the pipe wherein the substrate is immediately adjacent the internal surface of the pipe and surrounds the film. The calibrating element is separable from the film and can be withdrawn from the interior of the inverted film by a flexible cord. The resin in the substrate sets upon inversion and maintains the inverted substrate in contact with the internal surface of the pipe.

Invertible liner for internal surfaces of fluid conveying pipes and the

A method of repairing a damaged (e.g., cracked) portion of a buried sewage pipe by permeating one or more layers of fibrous material with a hardenable plastic compound (such as epoxy resin), convoluting the thus obtained mat around a radially expandible length of hose to permit frictional engagement between the internal surface of the mat and the external surface of the hose, introducing the hose into a selected defective portion of the pipe, expanding the hose and the convoluted mat so that the mat engages the internal surface of the pipe, deflating the hose, and withdrawing the hose from the pipe, preferably after the plastic compound has set wherein a film of polyethylene is inserted between the external surface of the hose and the internal surface of the convoluted mat to enhance friction and to thus compel the hose to turn in the course of the expanding step. Expansion of the hose results in expulsion of some plastic compound beyond the peripheral surface of the convoluted mat; such compound bonds the expanded convoluted mat to the pipe and at least partially fills the crack or cracks in the adjacent portion of the pipe. Some plastic compound is also expelled at the axial ends of the convoluted mat to form a smooth transition between the internal surface of the pipe and the internal surface of the expanded convoluted mat.

Method of repairing buried sewage pipes

The method for lining a pipe laid in the ground, especially a sewer conduit made from concrete, asbestos cement or stoneware, comprises making a lining tube for the pipe with an outer layer and an inner layer made from fiber fleece and a barrier layer impermeable to fluid located between the inner layer and the outer layer. The outer layer is soaked with a stress-free hardenable plastic resin adhering well to the pipe in one or more regions of over its entire length and the inner layer is soaked with the same or another plastic resin having reduced shrinkage not impairing the outer layer. The lining tube is introduced into the pipe and pressed on the inner surfaces of the pipe to be sanitized. The plastic resin is hardened to form an adhesive bond between the pipe and the outer layer. Advantageously the outer layer is soaked with epoxy resin and the inner layer is soaked with polyester resin. The product of this method, a sanitized conduit, is also described.

Method for lining a pipe laid in the ground

Diarylguanidines can be isolated from the crude melt from the reaction of arylamines and cyanogen chloride in excellent quality and yield by dissolving the hot melt in water, extracting this solution with at least one polar, water-insoluble, organic compound, and precipitating from the purified aqueous solution the diarylguanidine by adding alkali metal hydroxide.

Process for isolating diarylguanidines

A method of salvaging a pipe conduit which has a predetermined inner diameter and is buried under ground, especially a sewer pipe includes the steps of soaking a resin-absorbing inner layer of a lining hose which further includes an impermeable outer layer that outwardly adjoins and surrounds the inner layer and has an outer diameter which is slightly smaller than the inner diameter of the pipe conduit to be salvaged with an amount of a resin that exceeds that needed for saturating the inner layer. The outer layer is perforated to form a plurality of flow-through openings for the resin therein. The lining hose is subsequently introduced in its collapsed state into the pipe conduit. Finally, the lining hose is shaped to conformingly line the pipe conduit by causing a fluid to flow at a superatmospheric pressure into an auxiliary hose at least partially received in the lining hose and including a turned-over region with attendant gradual advancement of the turned-over region of the auxiliary hose into the lining hose and escape of the excess amount of the resin through the flow-through openings.

Method of salvaging a pipe conduit buried under ground

A method of salvaging a pipe conduit which is buried under ground, especially a sewer pipe, includes soaking a resin-absorbing inner layer of a lining hose, which further includes an impermeable outer layer that outwardly adjoins and surrounds the inner layer, with a first resin. The lining hose is then placed into the pipe conduit. A surface region of a calibrating hose which is to contact the inner layer of the lining hose is provided with a layer containing a second resin. The lining hose is then shaped to conformingly line the pipe conduit. Such shaping involves introducing the calibrating hose into the lining hose in such a manner that the resin-containing layer of the calibrating hose contacts the inner layer of the lining hose and pressing the calibrating hose against the lining hose to urge the latter against the pipe conduit. Finally, at least one of the first and second resins is hardened. Preferably, the other resin contains a substance which chemically reacts with at least the one resin to cause the same to harden during the hardening step upon contact of the resin-containing and inner layers.

A cleaning cassette for the read/write heads of magnetic tape recorders is disclosed in which an interchangeable cleaning device 23 is mounted to a supporting member 16. This supporting member can be moved back and forth manually or by means of a driving force being internal to the cassette, such as a spring.

Cassette for cleaning the heads of a magnetic tape recorder

A lightweight construction with sandwich elements consisting of core and covering surfaces may be produced in that high-strength hollow profiles are fixed to a molded frame at a spacing from each other, the remaining space around the hollow profiles is filled with a pressure-resistant casting compound which supports the profiles, and the top layers which determine the bending resistance of the elements are applied thereto. In this manner multidimensionally curved covering surfaces of unlimited size, such as the bodies of boats, can be economically produced.

Lightweight constructions of increased strength and dimensional stability

This invention is concerned with a process for producing microporous coatings comprising (1) mixing an NCO-prepolymer prepared from polyisocyanates with compounds containing at least two isocyanate-reactive hydrogen atoms with about 3 to 40% by weight, based on the NCO-prepolymer, of a substantially inert, non-migrating liquid organic compound miscible with said NCO-prepolymer as a plasticizer; (2) adding about 3 to 300 weight % of water, based on the NCO-prepolymer, into the NCO-prepolymer-plasticizer mixture to form a water-in-oil emulsion; (3) adding a polyamine in a quantity substantially equivalent to the isocyanate groups; (4) applying a coating of the water-in-oil emulsion to a substrate; and (5) hardening the coating by evaporating the chemically unbound water from said coating.

Reactive polyurethane coatings

This invention relates to a new process for the production, in inert organic solvents, of physiologically compatible polyisocyanates containing isocyanurate groups which have a monomeric diisocyanate content, based on solids, of at most 0.7%, by weight. The process uses Mannich bases as the trimerizing catalyst at temperatures below 60.degree. C and the reaction is terminated at the desired degree of trimerization by thermally decomposing the catalyst or by deactivating with a catalyst poison.

Process for the production of polyisocyanates containing isocyanurate

Cross-linkable diisocyanate polyaddition products containing uretdione groups statistically distributed in the products prepared by reacting:

Polyurethane polyureas which contain uretdione groups

Formaldehyde and a polyaddition product of an organic diisocyanate and an organic compound having hydrogen atoms determinable by the Zerewitinoff method are reacted in a mixture of a tertiary alcohol and an inert organic solvent to form N-methylolated diisocyanate polyaddition products for use, inter alia, as coatings, lacquers and the like.

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Munchen, Germany

Hans Muller