An arrangement for calibration, an ovalness gauge, for pipes, boreholes or the like, especially calibration of constrictions by measuring of the smallest diameter of the constriction, comprises a body designed to be moved through the hole, an even number of sensors emerging from the body and able to expand against the wall of the pipe, and a mechanical-electrical signal transmitter arranged in the...

The herbicide phenmedipham is prepared from meta-aminophenol by reaction with phosgene in an alkyl alkanoate solvent to make meta-hydroxyphenylcarbamic acid chloride, followed by reaction of the chloride with methanol and then reaction of the obtained methyl meta-hydroxyphenylcarbamate with meta-tolyl isocyanate, to obtain the required methyl 3-m- toylcarbamoyloxyphenyl-carbonate.

Polyisocyanurate foams are prepared by reacting together an organic polyisocyanate, a blowing agent, a trimerization catalyst, and a minor amount of a polyol mixture prepared by digesting polyalkylene terephthalate, particularly polyethylene terephthalate, with a polyol, especially a glycol. Laminates of such foams exhibit a high degree of fire resistance, low smoke evolution on combustion, low fo...

A method of scrubbing reaction products resulting from flame burning of fuels containing impurities such as sulfur compounds, chlorine compounds, and fluorine compounds. The scrubbing is accomplished by the addition to the fire chamber of additives which bind the impurities. The additives are supplied to the burner flame by way of a gaseous and/or liquid carrier medium flow, accompanied by the for...

PURPOSE:To simplify the work and construction by assembling and connecting both links of a lifter inside both side frames so that the lifter and frame are assembled simultaneously. CONSTITUTION:Link mechanisms 5, 6 are assembled inside both side frames 3, 4. The front link portion consists of a front link 11, sector gear 12, center gear 13, and the sector gear 12 is pivoted on the side frames 3, 4...

A ladder set comprises a number of mutually interconnectable sections whereby the effective length of the ladder may be varied. Each section comprises two uprights 1 and a number of rungs 2 removably fixed therebetween, both uprights 1 and rungs 2 being in the form of profile sections. Each upright 1 has a longitudinal substantially enclosed pocket 4 for accommodating longitudinal projection membe...

The invention provides a composite carbon or graphite having desirable properties such as corrosion and wear resistance. The invention combines a graphite substrate with a protective porous zone of silicon carbide. The whole body of graphite plus silicon carbide then is infiltrated with aluminum phosphate. An adhered barrier of silicon carbide, ranging in thickness between 0.015 and 0.050 inch thi...

A tubular supply container for use in a medical syringe to dispense bone cement has a pipe formed tube with a slidable plunger. A smaller diameter injection pipe is removably secured to the forward end of the pipe formed tube. A funnel may also be applied to the forward end of the tube to assist in filling the container or may be placed on the rear end to serve as a stand.

PURPOSE:To form a nitride film having good quality and to improve the rate of growth by conducting the activated nitrogen formed in an electric discharge chamber disposed separately from a reaction chamber through a non-straight transport pipe to the reaction chamber and nitriding a sample directly. CONSTITUTION:The gas contg. nitrogen supplied through a gas introducing port 21 into a vacuum vesse...

This invention relates to silanes of the general formula RnSi(OCR21COZR)4-n where R represents the same or different monovalent hydrocarbon radicals or substituted monovalent hydrocarbon radicals, R1 is hydrogen or the same as R, Z is oxygen or the group where R1 is the same as above, n is 0 or 1 and oligomers thereof. These silanes are prepared by reacting silanes of the general formula...

NEW MATERIAL:An organocyclotetrasiloxane of formula [X is a group of formula II; Y is -OSi(CH3)3; R<1> is 1-8C hydrocarbon; R<2> and R<3> are H or 1- 6C (substituted) hydrocarbon; n is 2 or 3]. USE:A crosslinking agent capable of providing an organopolysiloxane composition having improved curing characteristics at room temperature without generating gases having a bad smell. PROCESS:One mole tetra...

The present invention provides a process for the preparation of 4-hydroxy-3-(heterocyclocarbamoyl)-2H-1,2-benzothiazine-1,1-dioxides of the general formula: wherein R1 is a hydrogen atom or a methyl radical, R2 is a nitrogen-containing heterocyclic radical and R3 is a hydrogen or halogen atom or a methyl radical, and of the alkali metal, alkaline earth metal and amine salts thereof, by...

The present invention provides compounds of the general formula I (I) wherein R1 and R2, which are the same or different, are unsubstituted or substituted aromatic rings, Alk is a straight-chained or branched lower hydrocarbon chain and Z is a hydrogen atom, with the proviso that when Alk is a straight-chained hydrocarbon chain, Z can also be a lower alkylamino radical of the general for...

PURPOSE:To form a flared inner hole of the end part of a glass pipe having the inner hole and make it suitable to a component for a connector of optical fibers, by covering the outer surface other than the end of the glass pipe having the inner hole with a corrosion-resistant coating, and treating the end part with a solution corroding the glass. CONSTITUTION:The outer surface 13 other than the en...

PURPOSE:To prepare a solution of sodium hexametaphosphate in a short time, by adding a solution of sodium bicarbonate, potassium bicarbonate, potassium carbonate or sodium carbonate to powdery sodium hexametaphosphate. CONSTITUTION:The powdery sodium hexametaphosphate used as the raw material is prepared by weighing a definite amount of the powder having a purity of >= about 75%, and sterilizing w...

1496454 Piperidine compounds SANKYO CO Ltd and CIBA-GEIGY AG 19 May 1976 [28 May 1975] 20635/76 Headings C2C and C2P [Also in Division C3] Piperidine compounds have the formula wherein Ra and Rb are each H, lower alkyl, alkenyl, alkynyl or aralkyl provided that both are not simultaneously H; Rc and Rd are each C 1-7 alkyl groups; Re is alkyl; Rf is alkyl, phenyl, aralkyl or a 5- or 6-membered het...

PURPOSE:After an amorphous or polycrystalline silicon film is converted into single crystal by laser beam annealing, the film is flattened by the mechanochemical polishing, thus producing a single crystal silicon film with extremely reduced surface roughness. CONSTITUTION:A polycrystalline silicon film 2 is accumulated by the CVD method on a quartz substrate 1 with grooves on its surface and annea...

1. Method for the control of the purification process in the purification of the filter material of textile rejection filters, preferably of the bag filter type, wherein the contaminated gas of a filter chamber is led in via a raw gas inlet and the filter material installed in the filter chamber, passes under the deposit of dust on the filter material and is drawn away from the filter chamber thro...