In order to correct non-linearities inherently existing in the relation between the value of a hydraulic fluid parameter controlled by a proportional valve and an operating signal controlling the valve, in an arrangement in which the setting of the valve is controlled by effecting a comparison between the operating signal and a feedback signal representing the valve movement, a memory is provided ...

A filament separatory module characterized in which the module is a coreless substantially cylindrical bundle of thread-like small diameter hollow bore filaments disposed in spaced relationship over the major portion of length and sealed at the ends into common manifolds.

A preferred bundle geometry providing a tight winding of filaments interlaced in such a manner that there is an even distribution of interfilament voids in connected tortuous paths and evenly distributed throughout the bundle, so that the fluid flow outside the filaments will have equal access to the surfaces of all the filaments is accomplished by helically winding the filaments with a rapid trav...

A sonic apparatus for bonding an orthodontic bracket to a tooth, comprising a pincer-type element having arms for holding the bracket and an attached sonic transmission line for applying a sonic frequency to the bracket through the arms of the pincer element.

A prewhirl construction for the compressor of a turbocharger. The periphery of the compressor input opening is provided with a plurality of slanted spin vanes which impart a tangential velocity to air entering the compressor. The air is thus provided with a velocity component similar to the compressor's impeller velocity. The input duct to the compressor carries a butterfly valve whose setting con...

A new metal-containing high siliceous porous crystalline material related to the structure of zeolite beta, a method of making same and the use thereof in catalytic conversion of organic compounds. The anhydrous form of the new metal-containing crystal has a calculated composition, expressed in terms of moles of anhydrous oxides per 100 moles of silica, as follows: (W)Q2O . (X)M2/nO . (y)L2O3 . 1...

The mechanism provides a disc brake assembly with zero drag when released. It controls the retractive movements of the caliper housing and the actuating piston, relying on predetermined dimensional and mechanical properties for functional repeatability. It uses friction rings and spring washers.

A slurry composition and method of using the same is provided which is particularly useful in filling spent in situ oil shale retorts to form a strong load bearing mass which minimizes surface subsidence. The slurry is formed by mixing spent oil shale with 50 to 300 weight percent water and at least one material selected from the group consisting of lignosulfonate, sodium silicate, and sodium gluc...

The low temperature stability of an additive product for imparting desirable properties such as water repellency, set-retardation, etc., to hydraulic cement compositions and Portland masonry cements in particular, is improved by the addition of a small amount of certain low molecular weight, water soluble, non-ionic organic materials (e.g. alcohols, ketones, amides, and aldehydes) to the additive ...

Cellulose fibers are treated with vinyl chloride polymer, a plasticizer and an isocyanate bonding agent. Composites are made from cellulose fibers dispersed in a matrix of plasticized vinyl chloride polymer, and bonded thereto with an isocyanate bonding agent. The composites can be molded or extruded to produce useful articles.

An actuator for a shoe drum brake has a body containing a tappet engaging one of a pair of brake shoes, and a split tappet of which the outermost piston engages the other brake shoe. A mechanical wedge actuator acts between the tappets for emergency and parking operation. The piston cooperates with an automatic adjuster of which a component normally engages an abutment member which bears against a...

A.F. Lurbak et al 11-1-2-4x SOLVENT SYSTEM FOR CELLULOSE Cellulose is activated by penetration of the cellulose with a polar medium and mixed at a temperature at which no significant degradation occurs with an amide selected from the group consisting of dimethylacetamide, 1-methyl-2-pyrrolidinone and mixtures thereof and from 3 to 15% by weight of lithium chloride. The cellulose is then dissolved ...

An improved method for dispersing an inorganic pigment uniformly in polyphenylene ether resins, A polyphenylene ether composition having an inorganic pigment uniformly dispersed therein is obtained by intimately mixing a polyphenylene ether resin and the inorganic pigment in a weight ratio of from 0.5.1 to 2:1 by a high-speed mixer to form a pre-blend, and then mixing the pre-blend intimately with...

In a process for aftertreating thermally presintered polymers of tetrafluoroethylene the optionally comminuted powders are subjected, at temperatures below +80.degree.C, to the action of a gas jet mill. Preferred starting materials are tetrafluoroethylene polymers containing a small proportion of a modifying monomer. By the aftertreatment the bulk density and the flow index of the powders are cons...

FIRE RESISTANT FOAM INSULATION This invention provides cross-linked, flame retarded poly(p-methylstyrene) foam insulation. It also provides a method for preparing it, that comprises incorporating a flame retarding amount of flame retardant material into poly(p-methylstyrene), foaming the resultant composition, and cross-linking.

An electronic control for a vehicle transmission having a clutch, the engagement of which is controlled in response to a clutch engagement signal. An electronic speed ratio logic for selection of the appropriate transmission gear ratio can produce a disengagement signal which overrides the engagement signal to cause disengagement of the clutch. A limiter is activated by a gear change signal from t...