Abstract: Silicon diimide having a carbon content of at most 0.5% by weight and a chlorine content of at most 20 ppm is prepared by reacting ammonia with organyl amino silane at 50.degree.-300.degree. C. at elevated pressure and is useful as an intermediate for high grade silicon nitride.

Abstract: Silicon boron nitride ceramics are produced from polyborosilizanes obtained from polymerized Cl.sub.3 Si--NH--BClX wherein X is --Cl or --NH--Si--Cl.sub.3.

Abstract: A fluid swivel is described, which enable the measurement and the adjustment of separation of seal surfaces. The fluid swivel includes inner and outer walls that are rotatably coupled about an axis and that form an annular chamber and a pair of gaps extending from the chamber. A hollow region is formed along each gap for holding a face seal, and the gap forms an extrusion gap portion extending radially from each hollow region. The inner and outer walls form axially-spaced wall surfaces adjacent to the hollow region, and one of the walls has a gage-passing passage leading from the outside of the wall to the space between the wall surfaces to pass a gage for measuring the separation gap between the wall surfaces. One of the walls includes a plurality of parts and also includes shims between the parts for enabling slight adjustment of the spacing between the seal surfaces, depending on the thickness of the shims.

Abstract: Silver salts, preferably AgClO.sub.4, AgBF.sub.4, and AgPF.sub.6 are oxidized electrolytically at -15.degree. to +10.degree. C. and a pH between 4.5 and 7.5 with a current density of 40 to 200 A/m.sup.2 to produce pure silver (III) oxide.

Abstract: Silver salts, preferably AgClO.sub.4, AgBF.sub.4, and AgPF.sub.6 are oxidized electrolytically at -15.degree. to +10.degree. C. and a pH between 4.5 and 7.5 with a current density of 40 to 200 A/m.sup.2 to produce pure silver (III) oxide.