Part of the flue gases from the gas or oilfired glass melting furnace is used to preheat the frit. The other part is used in a radiation recuperator to preheat the air of combustion. The two parts are then merged and used in a convective recuperator for an initial preheating of the air of combustion. One part of the flue gases from the melting furnace is directed to the preheater for frit in which...

PURPOSE:To bond leads and a sealing resin excellently by selectively forming a film consisting of a metallic oxide to the surface of a section being in contact with the sealing resin for an inner lead section in a lead frame. CONSTITUTION:Lead section 1 are sealed, a metal easy to be oxidized more than a lead-frame structure material such as nickel is plated and formed previously to sections excep...

PURPOSE:To receive semiconductor chips in size extending over a wide range by a lead frame of one kind by fitting a lump consisting of a conductor or an insulator at the nose section or a section in the vicinity of the nose section of an inner lead on the chip loading side of the lead frame. CONSTITUTION:Pillowy lumps 7 composed of a metal, ceramics or the like are fitted to sections under wires 5...

Compounds of the formula wherein R1 is hydrogen, an optionally substituted aromatic hydrocarbon radical, an aralkyl radical or an optionally substituted aliphatic hydrocarbon radical having up to 45 C atoms, R2 is an optionally substituted aromatic hydrocarbon radical, an aralkyl radical or an optionally substituted aliphatic hydrocarbon radical having 5-50 C atoms, X is O, S, NH or NR...

In the encoder an audio input signal is firstly given an adaptive pre-emphasis characteristic by a pre-processing circuit (16) and is then converted to a digital signal for transmission by a delta-modulator (22). In order to minimise the digital bit rate the delta-modulator (22) is rendered adaptive by deriving a step-size control signal in a circuit (18) responsive to the slope of the input signa...

PURPOSE:To make a fast, accurate file search by providing a means which reads search data regardless of variation in the running speed of a magnetic tape during the fast search. CONSTITUTION:Search data for specifying the map of respective data blocks recorded on the magnetic tape on a cassette deck 5 as an external storage device are inserted into the data blocks while modulated at a low frequenc...

A carbonaceous article, e.g., a carbon or graphite crucible or mold, is provided with an oxidation prohibitive coating comprising a rigid, glassy, ceramic, refractory material containing mullite and silicon carbide or boron carbide or both. The carbonaceous article has a coefficient of thermal expansion which is greater than about 1.5x10-6 inch/inch/ DEG C.

PURPOSE:To load chips in size extending over a wide range by a lead frame of one kind by bending the nose section of an inner lead in the lead frame toward the loading side and supporting a metallic fine wire for a connection by the nose of the inner lead. CONSTITUTION:The noses of inner lead sections 3 in a lead frame 1 are bent toward the direction of loading of a semiconductor chip, and recesse...

PURPOSE:To reduce the level fluctuation of the carrier chrominance signal by securing the voltage whose level changes according to the level of the burst signal given from the addition circuit.

An automatic gain control circuit for an AM receiver uses a signal having the same wavelength but reversed in phase with the signal in the antenna circuit. A variable resistance attenuator element such as a biased FET or PIN diode is used in the external antenna circuit having a winding to selectively attenuate the input signal to the tuning circuit including a secondary winding. Gain control is p...

PURPOSE:To obtain a single-polarization optical fiber having favorable characteristics by bringing a stress applying layer close to a core by reducing the thickness of a clad so as to produce efficiently large stress in the core. CONSTITUTION:A prescribed composite base material is heated and drawn to form a preform rod 33 having a clad material 27 around a core material 25 and a stress applying l...

PURPOSE:To obtain the titled product constituting of at least one kind among alkyl glycerylether phosphate and partly or completely neutralized product thereof using a basic substance and to obtain a product having superior safety, affinity to skin and excellent emulsifying effect. CONSTITUTION:The product is constituted or alkyl glyceryl ether phosphate expressed by the formula wherein R1 is 8-32...

PURPOSE:To prevent an optical fiber from shifting and reduce connection loss by tapering the connection-side end surface of the optical fiber insertion hole of a ferrule attached to an optical connector into a tapered opening part, fusing the projection part of the inserted optical fiber to a larger diameter, and then fixing the optical fiber in the opening part of the ferrule. CONSTITUTION:The ta...

PURPOSE:To eliminate the formation of foam in curing and prevent an increase in transmission loss by applying a curing accelerator to an optical fiber element wire connection part and surfaces of optical fiber element wires on both sides thereof, and injecting high polymer resin and curing the connection part. CONSTITUTION:Optical fiber cores 1 and 1' to be connected have coating layers 2 and 2' r...

Special adjusting apparatuses are not yet commercially available for monomodal optical transmitters. Adjusting apparatuses conceived for other purposes are not only very expensive, but also too bulky. The adjusting apparatus according to the invention requires a space of approx. 50 cm<3>, i.e. an axial length of approximately 40 mm and an area of approx. 12.5 cm<2>. It consists essentially of a ba...

PURPOSE:To make a fusion of tube into inside tube plate feasible securing perfect airtight by a method wherein a small welding torch reflecting laser beams only is inserted into inside of a tube. CONSTITUTION:After setting up a tube 3 and a small tube 4, a welding torch for laser welding is inserted into the tube 3. The welding torch with a reflector 5 at the end bends incident laser beams 11 proj...