An X-ray examination apparatus, for example, for dental use, comprises an extraoral radiation entrance screen which is displaceable in a plane which is transverse with respect to a normal thereto. Consequently, distortion-free imaging can be performed for the entire set of teeth and the adjoining regions of the jaws.

An automatic transmission with a torque converter for use with an internal combustion engine in which the ignition timing is changed over to an advancing timing region or a retarding timing region in response to the operating condition of the engine. Two different speed shifting characteristics are provided in response to whether the ignition timing is in the advancing timing region or in the reta...

A centrifuge for separation of two liquid phases of different specific gravities to be removed separately; the separation chamber has a first subset of openings communicating with a skimmer and a second subset of openings communication with a collector. In one position, a movable barrier plate covers the inner portion of the first subset and the outer portion of the second subset to direct the hea...

The invention provides an electric lead-acid storage battery of maintenanceless type, preservable charge with only the acid absorbed in the plates and separators. The battery is characterized in that the grids are made of an alloy of lead free of antimony, particularly lead-calcium-tin, and carry active material provided by pastes containing organic inhibitors, such as ligninsulphonic acids, and i...

Appts. for splicing yarns mechanically, operates to untwist yarn tails while the are mutually positioned spaced apart, and then bring the tails together for retwisting when trimmed to length. The appts. comprises opposed rings which are brought together and rotated in opposite directions to untwist the yarns and trim the tails to length. The yarns are then brought together and retwisted, at least ...

Thread retainer in the form of a tube (34) having a slot (36) and balls (40,44) which contact each other within the slot and are relatively movable along the tube axis to permit access of a thread to a passage (38) at the inner end of the slot, and removal of the thread from said passage.

1. Claims for the Contracting States : BE, CH, DE, FR, GB, IT, LI, LU, NL, SE Glues based on aqueous latex of plasticised vinyl acetate polymer containing at least one polyvinyl alcohol as a protective colloid, characterised in that, in the latex, the concentration in respect of dry materials is from 50 to 70% by weight, the size of the particles of vinyl acetate polymer having a molecular mass by...

The invention provides an offshore tower structure comprising a base structure for positioning on the sea bed, a central enclosed tubular column 20 containing services such as conductors and risers and extending from the base structure to above the water level, in use, for supporting a service platform 21 and at least three tubular support legs 22, 23, 24 each extending between the base structure ...

Herbicidal compositions containing a bipyridylium quaternary salt and an alkyl pyridine odourant.

A dual microprocessor computing system is used to control an engine in a motor vehicle. Each system contains a Personality Programmable Read Only Memory (PPROM) containing system calibration data that is transferred from the PPROM to the read-write memories in the microprocessors. In order to identify each PPROM a byte of memory contains a check sum and a byte of the microprocessor memory contains...

An apparatus for the comminution of concrements such as kidney stones, and including a source of shock waves partially surrounded by an ellipsoidal reflector, is improved in that the open end of the reflector for sound wave transmission is additionally defined by a plurality of sound attentuating rings diminishing in internal diameter with distance from the source of shock waves; additional featur...

1459285 Cyclopropane carboxylic acid esters IMPERIAL CHEMICAL INDUSTRIES Ltd 21 Nov 1975 [3 Dec 1974] 52231/74 Heading C2C The invention comprises a process for the preparation of an ester of 3-(2,2-dichlorovinyl)- 2,2 - dimethylcyclopropane carboxylic acid which comprises the steps of (a) causing an ester of glycine in the form of a water-soluble acid addition salt to react with an alkali metal n...

An improved annular shaped tire liner which is adapted to fit inside of, around and in contact with a casing of a pneumatic tire and in compression by the casing and a method for preparing the tire liner is described. The liner has a thickness which provides substantial protection against penetration of the tire to the inside of the casing. The tire liner is characterized by having a section which...

A process for preparing light-weight, insulating and semi-rigid or rigid elements, essentially comprises impregnating a porous supple material having an internal structure with preferentially open cells, with the desired quantity of a solution of a compound selected from the group comprising isocyanates, and having consequently in its formula at least a -NCO group, the material optionally having t...

A laminated self-destructing sealing cover (10) has a container cover area (14) and pull tab (16). Protrusions (18) extend from the outer edge of the cover area (14) to promote proper use of the cover (10). A slit (20) may be into the protrusion (18) or the outer edge of the cover area (14) to promote tearing of the cover upon removal of a container. The bottom side of the cover (10) engaging the ...

A modified low-density flexible polyurethane foam product having a relatively high degree of firmness as well as commercially acceptable dielectric heat sealing characteristics. The product formulation includes an intermediate constituted by a mixture of polyol and a polymer/polyol in a ratio imparting to the product a predetermined degree of firmness, and a thermoplastic additive whose dielectric...

For use in a tubeless pneumatic tire having puncture-sealing characteristics, an inner liner comprises a puncture-sealing laminate having two outer halobutyl polymer-containing layers and an inner butyl polymer-containing layer, the laminate having been irradiated such that the inner layer has a Mooney (ML 1+4 at 100 DEG C) of less than 12.

This invention comprehends a new and unique means for preventing the crowns (forward projections of the pleats) of a backflushable filter element from splitting due to the cyclic aciton that is experienced during cleaning and backflushing. In one embodiment, a plurality of spacers, preferably wedge shape, is positioned between the outwardly projecting pleats of the filter media thereby preventing ...

Compatible blends of an ethylene/methacrylic or ethylene/acrylic acid dipolymer or a terpolymer with n-butyl or isobutyl acrylate with an ethylene/X/Y terpolymer, where X is vinyl acetate or an alkyl acrylate and Y is CO or SO2, with an elastomer, a blowing agent, and a curing agent can be readily formed into stiff foamed articles having very good physical properties, especially split tear and ten...