A method for the production of a printed wiring board according to this invention includes applying a preflux represented by the following general formula (1): ##STR1## (wherein R.sub.1 stands of H or an alkyl group of one to 17 carbon atoms, R.sub.2 for H or an alkyl group of one to six carbon atoms, and n for an integer in the range between 0 and 3) or the following general formula (2): ##STR2## (wherein R.sub.3 stands for H or an alkyl group of one to six carbon atoms, R.sub.4 for H or an alk...

A biologically persistent, water-soluble, substantially non-immunogenic, substantially non-antigenic conjugate of superoxide dismutase is prepared by coupling one to five strands of a polyalkylene glycol which is polyethylene glycol or polyethylene-polypropylene glycol copolymer, wherein said polyalkylene glycol has an average molecular weight of about 35,000-1,000,000.

A bubbler device is disclosed, which comprises of a suitable number of bubbling portions and is located on the bottom in a rinse vessel for washing semiconductor materials set in a carrier. The respective bubbling portions have a filter consisted of a fine mesh which enables passage of gas but hinders penetration of liquid, to thereby generate bubbles through the filter so as to promote the washing of semiconductor materials without penetration of the liquid. The filter is releasably mounted on ...

A balance shaft is comprised of cylindrical members provided inside a golf shaft at appropriate points to give the golf-shaft an ideal whippiness and ensure the club-head makes accurate contact with the ball.

A method of manufacturing lead fibers and radiation shielding materials using the lead fibers so manufactured as disclosed. The fibers contain 50 to 500 ppm of tin and preferably are below 60 microns in diameter. The fibers are produced by melt spinning through a spinneret. Radiation shielding materials can be made by dispersing the fibers homogeneously into a resin, which may be formed into sheets or which may be processed into woven, knitted or spin-bonded fabrics.

An alternate mechanism comprising a plunger (4) supported for a linear movement, a rotary cam (71) rotatably supported by the plunger, a spring (43) for biasing the plunger toward an original position (P.sub.1) of the plunger, a first stationary cam (76) which as the plunger is pushed to a first position (P.sub.2, P.sub.3) against the spring, is adapted to be engaged with the rotary cam so as to rotate the rotary cam by a predetermined angle, and a second stationary cam (32) which as the plunger...

A water-soluble covalent polysaccharide-diphtheria toxoid conjugate having a molecular weight between 140,000 and 4,500,000 dalton and a ribose/protein ratio between 0.25 and 0.75, capable of producing T-cell dependent antibody response to polysaccharide from H. influenzae b, prepared by mixing a derivatized diphtheria toxoid in a substantially cyanogen halide-free solution with a cyanogen halide-activated capsular H. influenzae b polysaccharide hapten consisting of approximately equal parts of ...

1,8-Dihydroxy-9-anthrone derivatives, substituted in the 10-position by an unsaturated radical, are described which have utility as ingredients in human and veterinary pharmaceutical and cosmetic preparations and which are compounds of the structural formula ##STR1## wherein R.sub.1 represents a hydrogen atom or a --CO.sub.2 R'.sub.2 radical, R.sub.2 and R'.sub.2 identical or different, represent a hydrogen atom, a linear or branched chain alkyl radical having 1 to 6 carbon atoms, a cycloalkyl r...

A novel trifluoropropyl derivative of mono-substituted benzene represented by the general formula: ##STR1## wherein R is halogen atom, hydroxy, trifluoromethyl, n-octyl, n-dodecyl, or phenoxy group not substituted or mono-substituted by 3,3,3-trifluoropropyl group, and n is an integer of 1, 2 or 3, with the proviso that the total number of 3,3,3-trifluoropropyl group of the derivative of mono-substituted benzene is at most 3, and a process for producing the derivative of mono-substituted benzene...

An improved process for preparing m-alkylhydroxybenzene which comprises heating alkylbenzene or an isomeric mixture of alkylbenzenesulfonic acid in the presence of sulfuric acid and an inorganic salt at a temperature of from 150.degree. to 210.degree. C. to form an isomeric mixture of alkylbenzenesulfonic acid which is rich in the m-isomer, selectively hydrolyzing the isomers of alkylbenzenesulfonic acid other than the m-isomer, and caustically fusing the unhydrolyzed alkylbenzenesulfonic acid.