CENTRIFUGAL LYOPHOBIC SEPARATOR NASA Case No. LAR-10194-1 Canada, Great Britain, France, Address inquiries to: Mail Code: 313 Langley Station Hampton, VA 23665 [Corresponding to U.S. Patent No. 3,828,524] This is a centrifugal separator for the separation of aerosols from a mixed stream of gas and liquid. The invention utilizes both centrifugal force and a lyophobic filter, the combination of which presents several advantages. This invention relates to a centrifugal separator and more particularly to a separator of aerosols from a mixed stream of gas and liquid utilizing both centrifugal force and a lyophobic filter. The use of lyophobic filters to separate liquid aerosols from a gas stream is known in the art. Using both lyophobic filtration and centrifugal force however, has several advantages over the use of either method of separation by itself. In the strength of material testing of any specimen the ultimate goal is the acquisition of accurate and reproducible results. This invention is an improved method for the tensile testing of metal foil specimens and to an aligning apparatus for use in the method. Accurate, reproducible results in the tensile testing of thin metal foils are obtained by a method which comprises, before placing the test specimen in a tensile testing machine, working the side edges of the test specimen until the edges are parallel and flaw-free. METALLIC INTRUSION DETECTOR SYSTEM NASA Case No. ARC-10265-1 Great Britain, France, Canada, West Germany, Netherlands, Japan Address inquiries to: Mail Code: 200-11A. [Corresponding to U.S. Patent No. 3,676, 772] A system is described for determining the intrusion, relative size, and the physical characteristics of a metallic object in a predetermined space. Transmitter and receiver coil assemblies are arranged to define a space through which a metallic object is expected to pass. The assemblies are adapted to generate an electromagnetic field of predetermined energy per unit volume, with the receiver coil coupled to the energy source to indicate the intrusion of a metallic object into the electromagnetic field, whether the object is ferrous or nonferrous, and the size of the object. The subject matter of this invention is directed to a fire retardant polyisocyanurate foam which is resistant to high temperatures and which has exceptional dimensional stability. In general, the present invention is carried out by reacting an organic polyisocyanate in the presence of a blowing agent and catalyst with a low hydroxyl number, high molecular weight linear polyether polyol comprising a condensation product of a multi-functional polyol and propylene oxide with grafted polyacrylonitrile branched side chains. Thus the crux of the present invention is the employment of a polyol having grafted acrylonitrile side chains which cyclize at elevated temperatures to form stable heterocyclic structures. By employing the polyol having a high molecular weight and low hydroxyl number, only small amounts of the isocyanate groups are consumed to form urethane linkages. *Exclusively licensed to Avco Corporation. Please direct inquiries to: Fire Protection Materials, Avco Corporation, Avco Systems Division, Lowell Industrial Park, Lowell, Massachusetts 01851. POLYMERIC VEHICLES AS CARRIERS FOR NASA Case No. ARC-10325 *See address below. Canada, Japan, West Germany, Great Britain [Corresponding to U.S. Patent No. 3,663,464] Intumescent coatings when applied to the surface of an article provide protection from fire and heat. Many applications of the coatings (or paints) are envisioned which include use in schools, homes, office buildings, ships, spacecraft, aircraft, etc. This invention relates to an intumescent agent which contains the ammonium salt of 4-nitroaniline-2-sulfonic acid and a polymer of the mercaptan type which may contain disulfide linkages or polyoxyalkylene linkages. The adhesion and char resistance of such compositions can be further improved by the addition of epoxy resins. The composition exhibits high hydrolytic stability. *Exclusively licensed to Avco Corporation. Please direct inquiries to: Fire Protection Materials, Avco Corporation, Avco Systems Division, Lowell Industrial Park, Lowell, Massachusetts 01851. |