Akira Usami has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
Abstract: The present invention provides a low alloy steel and a weld joint thereof excellent in hydrochloric acid corrosion resistance and sulfuric acid corrosion resistance, said low alloy steel containing, in mass, C: 0.001 to 0.2%, Si: 0.01 to 2.5%, Mn: 0.1 to 2%, Cu: 0.1 to 1%, Mo: 0.001 to 1%, Sb: 0.01 to 0.2%, P: 0.05% or less, and S: 0.05% or less, with the balance consisting of Fe and unavoidable impurities; and the acid corrosion resistance index AI of said low alloy steel being zero or positive. Here, said AI is given by the following expression, AI/10,000=0.0005+0.045×Sb %?C %×Mo %, where % means mass %.
Abstract: An e-mail delivery apparatus enabling a user sending e-mail to designate a time the e-mail is delivered to a user to whom the e-mail is sent, including a receiving unit for receiving e-mail and transmission time information designating the time the e-mail is to be sent to the mail destination, a memory for storing the received e-mail and the transmission time information, and a transmission unit for reading the e-mail stored in the memory means based on the transmission time information and sending information in accordance with the read e-mail to the mail destination.
Abstract: A lumped element circulator having a plurality of operation bands, has a circulator element with a plurality of signal ports and a grounded terminal, and resonance circuits connected between the signal ports and the grounded terminal, respectively, each of the resonance circuits having a plurality of resonance points. The number of the operation bands is equal to the number of the resonance points of each of the resonance circuits.
Abstract: The present invention has an object to provide a steel for a chimney or a gas duct, which is excellent in pitting resistance and rust adhesion in a corrosive environment caused by combustion waste gas in a plant in which the combustion of natural gas occurs. Pitting resistance and rust adhesion are remarkably improved in the steel of the present invention which steel is prepared by using a 5% Cr steel as the base, while reducing an impurity sulfur to not more than 0.010 wt. %, adding titanium within a range of 0.005 to 0.05 wt. %, and further adding nickel alone within a range of 1.0 to 2.5 wt. %, or adding molybdenum alone within a range of 0.10 to 1.0 wt. %, or adding in combination therewith trace amount of copper or molybdenum within a range of 0.10 to 1.0 wt. %.
Abstract: The invention relates to a steel plate which exhibits a good resistance to a corrosive atmosphere, containing weakly acidic condensed water comprising SO.sub.2, Cl.sup.- ion, and CO.sub.2 such as the exhaust gas from a boiler which burns LNG.The steel plate having a good corrosion resistance to condensed water characterized in comprising a low C content, a low Mn content and a medium amount of Cr content, and further 0.01% or less of S in an unavoidable impurity, or further comprising at least one element of Si, Al, Cu, Ni, Mo, Nb, V, Ti, Ca, and B. More, the steel plate having a good corrosion resistance to condensed water comprising carbonic acid gas and chloride ion characterized in comprising a low C content, a low Mn content, P, Cu and Ni, and further 0.01% or less of S in an unavoidable impurity, or further comprising at least one element of Si, Al, Mo, Nb, V, Ti, Ca and B.
Abstract: Applying a first light (.lambda.=950 nm) to a Si wafer to generate electron-hole pairs, a microwave is emitted to the Si wafer and the amount of reflection of the microwave is measured. In like manner, applying a second light (.lambda.=633 nm), the amount of reflection of the microwave is measured. The two amounts are normalized by intensities of the lights respectively. In order to cancel an error resulting from geometrical position between a measuring apparatus and the Si wafer, a normalized finite difference is calculated through subtraction between the normalized amounts. The difference may be obtained by another calculation so that it stays in a specified width when a uniformly doped Si wafer is measured.
Abstract: This invention discloses a method for contactless evaluation of characteristics of semiconductor wafers and devices. The method includes the steps of (a) continuously irradiating focused microwaves on a surface of a semiconductor specimen; (b) continuously receiving reflected microwaves reflected from said surface; (c) irradiating a focused laser beam pulse on the specimen, energy of the pulse being in excess of the band-gap energy of the semiconductor material; (d) measuring lifetime .tau..sub.m from the time-history of the characteristics of the reflected microwaves; and (e) calculating the surface recombination velocity S and bulk lifetime .tau..sub.b. The focused microwaves and focused laser beam can improve the resolution during measurement.
March 13, 1989
Date of Patent:
August 14, 1990
Mitsubishi Kinzoku Kabushiki Kaisha, Japan Silicon Co., Ltd.
Abstract: A sanitary napkin comprising a filler including a water-permeable layer of hydrophobic fibers for passing the body fluid therethrough and an absorbing layer underlying the layer for absorbing the fluid, and a water-permeable covering which covers the filler. The napkin is used with the water-permeable layer in contact with the human body. The water permeable layer has outstanding water permeability and functions to prevent reverse flow, permitting the absorbing layer to readily absorb the body fluid while preventing the fluid from returning toward the body. The napkin therefore has an agreeable feel at all times during use without feeling wet or sticky. The cushioning property of the water-permeable layer also gives a comfortable feel.
Abstract: An absorbent material comprising cellulose acetate fibers has a good capacity to absorb water and a slow speed of water absorption, so that it can be successfully used to make sanitary products such as disposable diapers and sanitary napkins. The sanitary products prepared with the absorbent material provide improved comfortableness and leakproof properties.
Abstract: An N/P type silicon solar cell is doped with copper and encased in an aluminum sheath to form a probe. A heavy metal foil means is inserted in the probe to accomplish a solid state ionization chamber of silicon PN-junction type.