A light curing composition for dental restoration comprises (a) a polymerizable compound containing at least one ethylenically unsaturated double-bond, (b) at least one photo-polymerization initiator selected from ketal base compounds defined hereinafter, (c) at least one photopolymerization initiator selected from thioxanthone base compounds defined hereinafter, (d) a reducing agent and (e) a fil...

An improved bone cement is comprised of a particulate biocompatible calcium phosphate ceramic and particulate resorbable calcium salt dispersed in a cross-linked biodegradable polyester matrix. The polymer/salt-particle composite exhibits good biomechanical strength/modulus characteristics with surgically acceptable cure times. When used for sustained release of biologically active agents in a phy...

This invention relates to a tag useable with an electronic article surveillance system and comprises of planar conductive material cut into a pair of inverse, first and second spiral conductors wrapped about each other and positioned for capacitive and inductive coupling. The invention also relates to method of making tags wherein conductors are cut from a planar web of conductive material in a co...

A method is provided for bridging between disjointed contour elements in an image by searching for an optimum bridging path between the facing ends of disjointed contour elements in the image. The method of the steps of defining a search window between each of the facing ends of the disjointed controur elements, considering in the window the different image points as nodes on a graph, determining ...

This specification discloses an improved electrically heated vision unit in which heat can be concentrated in a selected zone or zones thereof. The unit includes at least one sheet of a relatively rigid transparent material (12) having a ceramic enamel (14) bonded to and extending along at least two opposite edges on one surface thereof. A pair of electrically conductive bus bars (16) are provided...

The stringers of two sets of stringers crossing orthogonally to form a skeleton stringer pallet have edge forkway notches, ends of which notches are formed by crossing stringers so that the upright faces of such crossing stringers serve as a guide for the prong of a forklift inserted into the forkway notches.

A pallet is constructed of two parallel lower beams on edge and four parallel upper beams on edge crossing the lower beams and connected to the lower beams by notched joints which provide clearance for the fork of a forklift beneath the upper beams at two sides of the pallet, and above the upper edges of the lower beams and below the upper edges of the upper beams at the other two sides of the pal...

A simple, less costly prepolarizing prism assembly for a four color liquid crystal light valve image projector is disclosed. The invention is a unitary assembly which provides a combined beam of light having a first component of a first color and first polarization state and a second component of a second color and a second polarization state. The invention includes a first color filter for reflec...

A blended hydraulic cement composition, curable at low temperatures, including temperatures below the freezing point of water, is composed of portland cement, slag, pozzolans including metakaolin, and admixtures including potassium carbonate and water reducing compositions. The cement is particularly useful in producing concrete compositions which achieve high strength in a brief period of time, a...

The invention is directed to a method for producing a cement product for the terminal storage of tritium water wherein activated bentonite capable of swelling is dispersingly mixed with the tritium water and the suspension obtained thereby is subjected to a swelling operation. The swollen suspension is dispersingly mixed with cement. The cured product has a water content of over 75% by weight.

An aerobic biodegradation method is provided utilizing a biologically pure culture of a strain of Pseudomonas putida which is capable of degrading PCBs free of vicinal hydrogen atoms as well as congeners unchlorinated in either a 2,3 position, a 3,4 position, or both 2,3 or 3,4 positions.

A method of encapsulating an electronic device on a substrate comprises depositing a radiatively curable barrier wall to contain a subsequently deposited encapsulant. Alternatively, an encapsulant comprising a majority of radiatively curable material is used in the absence of a barrier wall.

An integrated circuit chip mounting and packaging assembly is described. The assembly comprises a spreader having one or more chips centrally mounted thereon. A plurality of leads are disposed outward of the integrated circuit chip on the same side of the spreader as the chip. When fully assembled, the spreader is positioned, chip side down, over a cavity in a printed circuit board-like substrate....

PURPOSE:To prevent the generation of a crater by the generation of a spark by welding with the beam projection by superposing the initial welding part of the needle main body welded by at least bean projection and a pipe. CONSTITUTION:An eyeless needle is manufactured by integrally joining a needle main body 1 and pipe 2 linearly by projecting the laser light 6 of small power to these weld zone (a...

PURPOSE:To improve work efficiency in a host access system by excluding the terminal having a switch request from a data receiver for the host computer serving as the hitherto data offerer and switching the host computer of the data offerer against said excluded terminal. CONSTITUTION:When either one of terminal equipments 12-1-12-m sends a switch request to a terminal controller 13 for host compu...

Process for producing agglomerates which are resistant to leaching out A process for the production of agglomerates which are resistant to leaching out, from finely divided waste materials, is characterised in that a hydraulic binding agent is dissolved in water under a condition of forced mixing until it substantially no longer sediments, the resulting aqueous colloidal solution is combined with ...

An integrated circuit package having a substrate of ceramic material having a cavity therein, a resilient seal rim connected to the substrate, a lid that may be inserted within said rim and a band of shape-memory alloy surrounding the rim to compress the rim into contact with the lid to seal the package.

An improved thermal efficiency power plant for converting fuel energy to shaft horsepower is described. The conventional combustor of a gas tubine power plant is replaced by a direct contact steam boiler 8, modified to produce a mixture of superheated steam and combustion gases. Combustion takes place preferably at stoichiometric conditions. The maximum thermal efficiency of the disclosed plant is...

A method and apparatus for coating a fastener, particularly a fastener with a head portion and shank portion, with a coating material is provided. The invention includes the steps of and apparatus for supporting the fasteners such that the fasteners are positioned for coating. The fasteners are conveyed such that the fasteners are moved through a plurality of operation stations and pass through a ...

Electrically conductive microparticles characterized by high conductivity and low density are comprised of electrically nonconductive microspheres having an electrically conductive coating of a metal. When dispersed in an electrically nonconductive matrix, an electrically conductive composite material is formed in which the microparticles form a network of contacting particles throughout the matri...