Abstract: A laminate comprising glass fiber woven fabrics impregnated with thermo-setting resin and superposed one on another while heated and pressed and said glass fiber woven fabrics having warps and wefts which are of components different from each other and of coefficients of thermal expansion different from each other.

Abstract: Glass fiber for non-woven fabric base material of a laminate having a surface treated by sizing agent essentially comprising silane coupling agent and dispersing agent, and said silane coupling agent including epoxy-silane and styryl amino-silane.

Abstract: A lead acid storage battery comprises a group of electrode plates, wherein a negative plate is enclosed in an enveloped separator joined together at its both edges by welding or mechanical sealing and a glass mat is separately provided between the separator and a positive plate, the glass mat having a width at least equal to the width of the separator except its both edges.

Abstract: A phenol resin toothed wheel having a toothed portion formed of meta-aromatic polyamide fiber spun cloth impregnated with phenol resin blended with epoxy resin.

Abstract: An Sn or Pb/Sn alloy heat-treated at 170.degree. C. or higher for a given period of time is applied to the surface of a collector to make a lead storage battery which is improved in terms of its chargeability upon left overdischarged.

Abstract: An epoxy resin laminate comprising a center base layer of glass fiber woven cloth and outer base layers of sheet-like material more expansible and compressible than glass fiber woven cloth provided on both faces of the center base layer and integrally impregnated with composite produced by reacting polybutadiene-acrylonitrile copolymer having carboxyl groups at its terminal with epoxy resin having more than two functional groups.

Abstract: A metal foil covered laminate comprising a sheet-like base formed of at least two of meta-aramid fiber, polyethylene terephthalate fiber and glass fiber and impregnated with epoxy resin including acrylonitrile/butadiene copolymer having terminal carboxyl groups and a metal foil covering on the sheet-like base.

Abstract: An enclosed type lead battery comprises in combination:a cap formed of a synthetic resin, which is integrally formed with anodec and cathodec terminals formed of lead or a lead alloy inserted therein and an exhaust portion to which a safety valve is attached,a plate stack having its ears connected to said terminals, andan enclosure formed of a film or sheet made of a synthetic resin, in which said plate stack is placed, and which is thermally fused at the peripheral edge of its opening to said cap.

Abstract: This invention relates to an oscilloscope in which waveforms can be indicated on a matrix type plane display such as a liquid-crystal display or plasma display as well as on a CRT (cathode-ray tube). The oscilloscope of the invention comprises a memory in which waveform data can be written or from which it can be read, a writing control circuit to control writing the waveform data on the memory, a reading control circuit to control reading the waveform data from the memory and a display to indicate the read waveform data. The writing and reading control circuits have a predetermined writing prohibition period during which writing is prohibited after writing all the data of one waveform. The writing period during which data of one waveform is written has a minimum uniform length, and a period during which the data can be availably read from the memory becomes longer as the writing frequency becomes longer.

Abstract: This invention relates to a waveform observation apparatus such as an oscilloscope, and more particularly to a waveform observation apparatus suitable for a liquid crystal oscilloscope having a liquid crystal display of low power consumption.The waveform observation apparatus comprises at least a waveform memory in which a waveform data is to be written, an input circuit to control the waveform memory to write the waveform data therein and a power supply circuit to drive the waveform memory and the input circuit. The power supply circuit includes means to only intermittently apply the power supply voltage for at least part of the input circuit for a time necessary for writing a waveform. This causes the power consumption to be lowered.

Abstract: This invention relates to a process of producing a plate for a lead storage battery. A plate grid of lead material such as lead or lead alloy is formed by casting and a frame of acid-resisting plastic material is formed by molding which is to surround the plate grid. A plate substrate is formed by placing the plate grid into the frame. The plate substrate is filled with paste of lead oxide on both sides of the plate substrate, and then the paste filled in the plate substrate is partly dried. Thereafter, the plate substrate filled with the paste is covered with an acid-resisting fiber mat which is thermally adhered to the frame of the plate substrate. This invention also relates to a plate for a lead storage battery produced by the aforementioned process.

Abstract: This invention relates to a process of producing a plate for a lead storage battery. A plate grid of lead material such as lead or lead alloy is formed by casting and a frame of acid-resisting plastic material is formed by molding which is to surround the plate grid. A plate substrate is formed by placing the plate grid into the frame. The plate substrate is filled with paste of lead oxide on both sides of the plate substrate, and then the paste filled in the plate substrate is partly dried. Thereafter, the plate substrate filled with the paste is covered with an acid-resisting fiber mat which is thermally adhered to the frame of the plate substrate. This invention also relates to a plate for a lead storage battery produced by the aforementioned process.

Abstract: This invention relates to a process of producing plate grids for a lead acid storage battery. The process of the invention comprises the step of striking hard particles against surfaces of grid material to form roughness on the surfaces of the plate grids. The hard particles may be struck against surfaces of a lead alloy strip which the plate grids are to be made of by expanding or punching. They may be struck against surfaces of a mesh-like lead alloy strip which is formed by expanding or punching a lead alloy strip. Otherwise, they may be struck against the surfaces of a lead alloy strip and then against the surfaces of the mesh-like lead alloy strip which is formed by expanding or punching the roughened lead alloy strip.

Abstract: This invention pertains to an electric storage battery and more particularly to a connector for electrically connecting adjacent cells of the electric storage battery with each other.The electric storage battery comprises a battery case having partition walls provided to form compartments therein, cell components disposed within the respective compartments and including a plurality of positive and negative plates alternately arranged with insulating separators disposed between the adjacent positive and negative plates, and connectors provided between the adjacent cell components for electrically connecting them. Each of the connectors comprises first plate lugs of the positive plates for one of the adjacent cell components and second plate lugs of the negative plates for the other of the adjacent cell components, the first and second plate lugs facing each other through the corresponding partition wall of the battery case and being deformed to be gathered together and being welded integrally with each other.

Abstract: A system for measuring the state of charge of a storage battery is disclosed which corrects charging and discharge electrical quantities of the battery in view of temperature and charging efficiency of the battery, and the like to precisely measure the state of charge thereof by digital-operation. There is also disclosed a system correcting, by digital-operation, the variation in capacity of the battery due to the variation in life of the battery and/or the self-discharge thereof as well, to thereby measure the state of charge with higher precision.

Abstract: This invention relates to a printed wiring board having two electrically conductive circuit layers on an insulating laminate. The insulating laminate includes a first insulating layer having a thickness of 0.01 to 0.5 mm, and metal foils are provided on both sides of the first insulating layer. Metal foil circuit layers of predetermined patterns are formed by printing and etching the metal foils. Thereafter, through holes are formed in the first insulating layer across the facing metal foil circuit layers, and then electrically conductive members are applied over the through holes and the metal foil circuit layers at their ends. After that, a second insulating layer is attached onto one of the sides of the first insulating layer on which the connected metal foil circuit layers are provided.

Abstract: This invention relates to a process of producing a printed wiring board having first and second electrically conductive circuit layers provided on an insulating laminate. The insulating laminate includes a first insulating layer having metal foils provided on both sides thereof and a second insulating layer which is attached to one of the sides of the first insulating layer so as to place one of the electrically conductive circuit layers between the first and second insulating layers. The first electrically conductive circuit layer is formed in a predetermined pattern by printing and etching one of the metal foils. Then, connecting through-holes are formed in the first insulating layer across the first electrically conductive circuit layer and the remaining metal foil. The second insulating layer is attached onto the first insulating layer so that the first electrically conductive circuit layer is covered with the second insulating layer.

Abstract: An electric storage battery comprising a closure sealed with a battery casing and having gas venting means which allows gases from cells to be vented out of the storage battery, but which prevents electrolyte mist and water steam from the cells carried together with the gases to be leaked out of the storage battery. A gas cooling chamber is provided on a battery cover of the closure and has a water returning cylindrical portion provided on a bottom of the gas cooling chamber and having a water returning lateral port adapted to return the water. A gas filter chamber is provided adjacent to the gas cooling chamber to communicate with the gas cooling chamber through an opening in the wall of the gas cooling chamber at the top thereof and has an explosion-proof gas filter of porous ceramics provided to vent gases therethrough.

Abstract: In a process for casting a plate grid for a lead-acid storage battery comprising the steps of preparing a casting die assembly including two interengagable die halves between which is formed a casting cavity to cast a plate grid therein and pouring a molten metal of lead or lead alloy into said casting cavity to form said plate grid therein, an air in said casting cavity is vented through gaps between said die halves and then through a narrow air passage in at least one venting member received in either of said die halves so that said venting member is flush with the casting surface of the corresponding die half, said venting member at the top surface having cavity forming portions operatively associated with said die halves.

Abstract: An indicator in use with a lead storage battery comprising a case and battery elements disposed in said case, said battery elements including electrolyte and a set of plates, said indicator adapted to indicate the overdischarge of said storage battery and also the lowered level of said electrolyte beyond minimum allowable level. The indicator comprises a cylindrical hollow body of transparent material with the upper end of the body exposed to the top of the case and with the lower end of the body positioned substantially at the minimum allowable level of the electrolyte, said lower end of the body communicating the electrolyte within the case. A colored float is disposed within the cylindrical body for vertical movement therein, said float having a specific gravity less than that of the electrolyte when the storage battery is charged at predetermined degree and greater than that of the electrolyte when the storage battery is discharged beyond the minimum allowable degree of charging condition.