Pigment-containing granules for use in coloring cement. The granules comprise at least one pigment selected from the group consisting of maganese oxide and iron oxide and a binder. The binder is a hydrophilic clay, and is preferably pozzolan.

Metal oxide coated mica pigments are provided with enhanced light and moisture stability by providing on the particle surfaces a coating of hydrous aluminum oxide.

Iron oxide-coated micaceous pigments having a chroma enhancing amount of a coating of a colorless metal oxide which has a refractive index of at least about 2.0 exhibit intensely colored effects.

Nacreous pigments which have improved stability to weathering and are based on mica flakes coated with metal oxides, are provided with a stabilizing, chromium-containing second coating which comprises a combination of metal salts. To form the second layer, iron and/or manganese are deposited on the starting pigments in the form of the hydroxide, carbonate or phosphate and chromium is deposited on the starting pigments in the form of the hydroxide, carbonate or phosphate or as methacrylato-chromi...

Golden colored nacreous pigments are produced from mica flakes coated with a layer of TiO.sub.2 and/or ZrO.sub.2 by a process comprising the precipitation of an iron hydroxide thereon from an aqueous iron salt solution by precipitating the iron hydroxide at a pH of above 5 from an aqeous ferrous salt solution and thereafter converting the thus-precipitated layer of iron hydroxide on the coated mica flakes to Fe.sub.2 O.sub.3.

A rotary vane apparatus where the rotor has a rotational axis and carries at least one vane which is supported by a vane guide apparatus for rotation about a stator axis which is spaced from the rotor axis a preselected amount and where both the rotor and vane have axial flat surfaces which are rotated adjacent to stationary flat surfaces of a stator or stator endplates, the invention provides axial adjustment of the vane with respect to the flat surface of the stator endplates and independently...

The present invention discloses a rotary machine, such as a motor or a pump, which works with a fluid in the form of a gas or a liquid. The rotary machine comprises a housing, an annular passageway arranged in the housing, and at least two rotor-driven blades which run in the annular passageway and which are movable radially in the rotor. The passageway includes a fluid inlet, a fluid outlet and a constriction located therebetween in the passageway. The radial movement of the blades is guided fo...

A cylindrical casing has a rotor mounted for rotation within the casing on an axis which is radially offset from the axis of the casing and the rotor drives a number of angularly spaced blades which have their center of rotation defined by the central axis of the casing. The mounting for the blades includes radial adjustment clearance from the confronting surface of the casing and the mounted radially inner portions of the blades are adapted to move chordally relatively to their mounting means a...

Improved pearlescent pigments are prepared by combining an aqueous, divalent metal salt solution with an aqueous solution comprising an alkali metal biphosphate or ammonium phosphate and a reducing agent. The combination of solutions yields metal acid phosphate or metal ammonium phosphate in crystalline form with a portion of the metal reduced to the free metallic state. The metal acid or ammonium phosphate crystals are plated onto the surface of mica or similar material at the time of formation...

Non-bleeding, non-agglomerated, lustrous colored combination pigments constitute a platy substrate and absorption colorant bound thereto with metal hydroxides and one or more hydrolyzed silane coupling agents.