Abstract: A linear motor comprising a stator core and/or a mover. The stator core of said linear motor comprising an inner perimeter, an outer perimeter essentially encircling the inner perimeter, a first and a second tooth being arranged along one of the inner perimeter or the outer perimeter, a slot for receiving a stator coil, said slot being a cavity arranged within the stator core, wherein said stator core is divided into a first stator part and a second stator part, said first stator part including the first tooth, being arranged to partially define the slot, and being made of soft magnetic powder, and said second stator part including the second tooth, being arranged to partially define the slot, and being made of soft magnetic powder.

Abstract: Magnetic motor component sleeves (209) for motor components with the sleeves (209) having various helpful magnetic characteristics, such as high magnetic permeability; magnetic saturation; residual (or remanent) magnetization; anisotropic magnetic properties. Method for making a magnetic linear motor shaft (202), including thermal treatment to temporarily change the dimensions of various shaft components to allow tight assembly.

Abstract: An improvement in the production of methotrexate as set out in Ellard U.S. Pat. No. 4,080,325. It has been found that magnesium oxide facilitates the coupling reaction by acting as an acid acceptor. The dense grade of magnesium oxide is preferred in molar proportions of 2 to 4 moles of magnesium oxide per mole of 2,4-diamino-6-hydroxymethylpteridine. Further, the triphenylphosphine oxide which is generated by hydrolysis of the protecting groups is removed from the reaction stream by utilization of toluene or BTX-type solvents.

Abstract: In a method of preparing methotrexate from a coupling of 2,4-bis(triphenylphosphazino)-6-bromomethylpteridine hydrobromide with ethyl N-(p-methylamino)-benzoyl-L-glutamate to produce the phosphazino derivative of methotrexate ester and subsequently hydrolyzing the phosphazino and ester groups to produce the free methotrexate, the pteridine synthesis step wherein molecular oxygen is substituted for reaction air and the pH throughout the pteridine synthesis is regulated to between 2.5 and 5.4, the preferred pH being about 3.0 and producing from tetraaminopyrimidine and dihydroxyacetone the isomer 2,4-diamino-6-hydroxymethylpteridine over 2,4-diamino-7-hydroxymethylpteridine in a ratio of about 20:1. Exemplary of other situations involving pteridine where the molecular oxygen may be substituted for reaction air are: in the production of folic acid, tetrahydrofolic acid, etc.

Abstract: Fire-resistant organic materials including foams, are made by heating at temperatures sufficient to cause polymerization and elimination of nitrogen and sulfur precursor aromatic polymers having sulfonamide linkages and aromatic compounds capable of forming said polymers, e.g. sulfamyl-type aminoaromatic compounds such as sulfanilamide, sulfaguanadine and the like. Preferred compounds are those providing para linkages in the sulfonamide polymer chain, those which are substantially free of oxidizing substituents, for example nitro groups, and those which are not fused-ring aromatic. Preferred foams are the high expansion foams, i.e. those having expansion ratios of at least about 3:1, more preferably at least about 8:1. The precursors of these fire-resistant organic materials can be incorporated into polymers such as polyvinylidene chloride, polyisocyanates, aminoplasts, and the like either physically by mixing or by chemical reaction to give improved fire-resistance.

Abstract: The present invention consists of three process improvements in the so-called multi-step Piper-Montgomery process designed especially to produce the antifolate methotrexate which is closely related to both aminopterin and folic acid. 2,4,5,6-tetraaminopyrimidine sulfite is one starting material and is usually produced in the form of the bisulfite in an acetate buffer. The present modification positively produces the hydrochloride from the bisulfite and eliminates the acetate buffer utilized in prior art processes. Subsequently, a pteridine ring is formed from the pyrimidine hydrochloride using dihydroxyacetone at pH 5.5.+-.0.2 to form the second ring. This strict pH control together with the use of hydrochloride salt minus the acetate buffer assists in preferentially favoring the formation of 2,4-diamino-6-hydroxymethylpteridine.

Abstract: Intumescent compositions are described which when deposited on a substrate protect the substrate against heat and fire damage for an appreciable time, and these compositions are readily removed from the substrate by water washing or water scrubbing both before and after intumescing. Another advantage of these compositions is that they give off very little smoke when exposed to heat and fire. The most effective of these compositions comprise monoammonium phosphate and/or diammonium phosphate as a heat- and fireproofing agent, urea and/or cyanoguanidine (dicyandiamide) as a gas forming or gas generating agent to promote the intumescence, sucrose (sugar) together with the phosphate to promote initial intumescence at low temperature and titanium dioxide as a heat-reflecting agent. Certain possible alternatives to the compounds named above are also named.