baber/WOPTO huggingface dataset:
Patent JP-2000193203-A (JP)
Title: Steam turbine
Inventor: OKU AKIO
IPC: F22D11/02
Filed: 1998-12-22
Abstract: PROBLEM TO BE SOLVED: To provide a steam turbine small in the number of constitution elements such as pipings and an oil pressure generating device, simple in system, and high in reliability. SOLUTION: This steam turbine device comprises a steam generator 1 to generate high temperature high pressure steam, a main turbine 3 to receive steam to effect an external work, a condenser 5 to receive steam brought into a low temperature low pressure at the main turbine, and a feed water piping 6 to re-feed condensate of a condenser to a steam generator. In this case, the steam turbine device comprises a motor-driven feed water pump 10 arranged on the feed water piping and drive by an electric motor, and a main turbine- driven feed water pump 13 axially coupled to the main turbine and arranged on the feed water piping in parallel to the motor-driven feed water pump and driven by the main turbine 3.
Patent JP-H04233467-A (JP)
Title: Method and apparatus for measuring speed of motor
Inventor: BIN SHIYUNKI
IPC: H02P29/00
Filed: 1990-12-14
Abstract: PURPOSE: To measure the speed of a motor in a wide range by a simple algorithm, by reading measurement pulses changed in frequency in accordance with the revolution number of the motor and generating reference pulses of a frequency larger than that of the measurement pulses. CONSTITUTION: A frequency generator 20 generates a measurement signal in accordance with the rotation speed of a capstan motor 10. A measurement pulse-generating means 30 converts the measurement signal of the generator 20 into a rectangular wave and generates a measurement pulse. A reference pulse-generating means 40 generates a reference pulse of a larger frequency than that of the measurement pulse. A start signal-generating means 50 is activated by the measurement pulse, and a sampling time-setting counting means 70 sets a sampling time. An end signal-generating means 60 is started by the measurement pulse. An operation means 100 determines a rotation number of the motor according to a predetermined formula from a count of reference pulses and a count of measurement pulses measured by a reference pulse- counting means 80 and a measurement pulse-counting means 90.
Patent JP-H04214822-A (JP)
Title: Method for treating surface of structure in nuclear reactor
Inventor: NAKASHIRO NORIYUKI
IPC: G21C5/00
Filed: 1990-12-14
Abstract: PURPOSE:To eliminate a chromium lacking layer in a welding zone and to improve the structure of the surface into a one excellent in intergranular corrosion cracking resistance by irradiating the surface of a welding zone in contact with furnace water in a structure in a nuclear furnace with a laser beam, melting it, rapidly cooling the melted zone and forming an amorphous layer. CONSTITUTION:The surface of the welding zone in the welding metal object 25 of a structure made of austenitic stainless steel or a nickel base alloy in contact with furnace water 15 in a nuclear reactor pressure vessel 1 is irradiated with the laser beam and is melted. The above-mentioned laser beam is generated by a laser oscillator 16 and is irradiated from an induction tube 23 and an emitting part 18. Next, this melted zone is rapidly cooled to form an amorphous layer preferably of about 80mum. This rapid cooling is executed by injecting liquid nitrogen via a feeding tube 28 and a nozzle 29. Thus, a chromium lacking layer in a range low in intergranular corrosion cracking resistance in the above- mentioned welding zone is eliminated, and the intergranular corrosion cracking resistance of the surface structure is improved.
Patent JP-H04218728-A (JP)
Title: Weight-measuring device of walking animal
Inventor: TAKEYAMA ICHIRO
IPC: G01G17/08
Filed: 1990-12-19
Abstract: PURPOSE:To enable working efficiency of a weight-measuring to be improved by closing an entrance side gate when a measurement data exceeds a setting value which is set based on a peak value which is measured after the gate at the entrance side is opened. CONSTITUTION:First, date and measurement conditions are set by starting control, thus enabling an entrance side gate 5 to be opened and an exit gate 6 to be closed for initial state. Then, sampling of a weighing value data W (t) is started and the weighing value data W (t) when a first peak exceeding a specific value is obtained is set as a reference value WP. Then, when the weighing value data W (t) exceeds a value which is 1.2 times larger than a reference value WP, it is judged that a cow is on a weighing stand 7 completely and the entrance side gate 5 is closed, namely a value WS which is 1.2 times larger than the reference value WP corresponds to the setting value. Then, the weighing value data W (t) is sampled for a certain amount of time and an averaging is performed. Then, the operation result is displayed on a display part as a weight of the cow, thus enabling animals to be separated one by one positively and weight to be measured.
Patent JP-H04220288-A (JP)
Title: Controller of electric washing machine
Inventor: ADACHI KAZUTOSHI
IPC: D06F33/02
Filed: 1990-12-19
Abstract: PURPOSE:To correctly set the washing water level in accordance with the cloth quality, in the washing machine. CONSTITUTION:A motor 1 drives a stirring blade provided in a washing tank, and a voltage detecting circuit 17 for detecting a terminal voltage of a capacitor 4 is connected in parallel thereto. Also, a water level detecting device 16 detects a water level in the washing tank, and outputs of the voltage detecting circuit 17 and the water level detecting device 16 are inputted to a control circuit 14. The control circuit 14 detects a prescribed water level before washing, detects the water level again after stirring for a prescribed time, decides the cloth quality, based on a water level difference between the prescribed water level and sets an inversion time of a washing water flow. Since the washing machine is provided with the above constitution, washing can be executed in an optimal level conforming to the cloth quality and the washing performance can be improved.
Patent JP-H04221823-A (JP)
Title: Substrate processing device
Inventor: SATO JUNICHI
IPC: H01L21/30
Filed: 1990-12-21
Abstract: PURPOSE:To prevent the occurrence of a temperature difference between sections of one substrate by providing a heat conductor to which the rear surface of each substrate is stuck in a chamber and performing plasma processing. CONSTITUTION:A substrate arranging jig 8 is composed of an aluminum punched plate, etc., which is made of a material having a good heat conductivity and constituted of a plate-like section 11 and leg sections 12. A plurality of clicks 13 are formed on both surfaces of the section 11 at regular intervals and a plurality of substrates K are stuck to both surfaces by engaging edges of the substrates K with the clicks 13. Electrodes 9 and 10 generate plasma by causing a reactive gas introduced into a chamber 7 in a pressure-reduced state to make electrolytic dissociation by high-frequency discharges and, at the same time, heat the substrates K by the heat radiated by the high-frequency discharges. In such constitution, the occurrence of a temperature difference between each substrate K or between sections of one substrate K is prevented by the movement of the heat through the plate-like section 11 and plasma ashing batch processing can be carried out under an extremely uniform temperature condition.
Patent JP-H04222746-A (JP)
Title: Roof panel and installing structure thereof
Inventor: YAMADA MITSUHIRO
IPC: E04D3/362
Filed: 1990-12-25
Abstract: PURPOSE:To provide a roof panel and its installing structure which can be piled up in transportation and storage and can easily placed even on a roof of steep slope. CONSTITUTION:A protruding portion 2 for nailing which protrudes upward is disposed on the surface side at the ridge end of panel body 1, and a recess portion 3 into which the protruding portion 2 for nailing is inserted when piled up is disposed on the back side. The lower roof panel A1 is fixed by driving a nail 6 from the protruding portion 2 for nailing to the roof bed 7 in the eaves ridge direction. The longitudinal portion 4a of locking recess 4 of upper roof panel A2 is engaged with the protruding portion 2 for nailing of tone lower roof panel A1. The locking member 5 installed at the ridge end of the lower roof panel A1 is locked to the transverse portion 4b of locking recess portion 4 of the upper roof panel A2.
Patent JP-H04222619-A (JP)
Title: Method and apparatus for wet desulfurization of exhaust gas
Inventor: NAKAO MOTOYUKI
IPC: B01D53/34
Filed: 1990-12-25
Abstract: PURPOSE:To reduce installation cost and operation cost by cooling exhaust gas to specific temp. or less by a cooler and using condensed water as water for a calcium compound slurry and separating and removing gypsum generated in the slurry by the absorption of sulfur oxide in an absorbing tower. CONSTITUTION:A cooler 22 is arranged to the inlet part 31 of a desulfurizer 30 to cool the temp. of exhaust gas to 40 deg.C or less. Formed condensed water is received in an absorbing tower tank 7 to be mixed with a limestone slurry. The limestone slurry is sprayed into an absorbing tower 6 to be reacted with SOx in the exhaust gas. An oxidized gypsum slurry is conc. or solidified to be recovered in a hopper 28. By this method, the system and equipment of the desulfurizer can be simplified and operation cost can be reduced.
Patent JP-H04223608-A (JP)
Title: Wide band amplitude equalizer
Inventor: KAGAMI OSAMU
IPC: G01R23/00
Filed: 1990-12-25
Abstract: PURPOSE:To enable the equalizing processing of the signal of a wide band in which plural notch frequencies are present by outputting control information corresponding to a corresponding notch frequency and sharpness to each equalizing circuit. CONSTITUTION:A notch detector 11 searches the number of notches, notch frequency, and sharpness by a fading in the prescribed band from an input signal, and transmits the information to an equalizing circuit control part 15. The equalizing circuit control part 15 switches a corresponding changeover switch 12 to an output B side so that equalizing circuits corresponding to the number of notches can be operated, transmits the information of each notch frequency and sharpness to corresponding equalizing circuits 16, and prepares the reverse characteristic of a falling characteristic by the fading. And also, the control of a variable gain amplifier 13 is simultaneously operated.
Patent JP-H04225336-A (JP)
Title: Stroboscopic device
Inventor: KOMATSU NOBUO
IPC: G03B7/16
Filed: 1990-12-27
Abstract: PURPOSE:To make the distance of a light control limit long and to irradiate only a main object with auxiliary light by detecting the brightness of every specified range of a photographic image plane and condensing the irradiating range of strobe light on the center in the case of judging that it is a rear light state. CONSTITUTION:A photometric element 19 performs divisional photometry by the use of respective photodetectors which divide the image plane into four, and a microcomputer 13 judges based on the difference of the light quantity whether or not it is the rear light state. When it is the rear light state, the microcomputer 13 controls a zoom stroboscope driving circuit 24, a zoom stroboscope motor 25 and a zoom stroboscope position detector 26, and controls the position of a strobe light emitting tube to a central condensing position according to the focal distance of the lens. At the same time, control for the object in a right-and-left direction is performed through strobe light emitting direction varying control mechanisms 27-29.
Patent JP-H04225058-A (JP)
Title: Unsaturated polyester resin composition
Inventor: TAKESHIMA MASAHARU
IPC: C08L67/06
Filed: 1990-12-27
Abstract: PURPOSE:To obtain an unsaturated polyester resin composition improved in molding shrinkage. CONSTITUTION:An unsaturated polyester resin composition is obtained by blending an unsaturated polyester resin composition containing about 0.1wt.% ethanol with tert. butyl peroxy-2-ethylhexanoate and tert. butyl peroxyisopropyl carbonate and further conventionally used additives, preparing a thermosetting unsaturated polyester resin paste, impregnating staple fiber prepared by cutting glass rovings with the resultant paste, producing a sheet molding compound(SMC), hot-press molding the produced SMC into a molded product in the form of a bathtub. Since a curing catalyst of a medium-temperature curing system is used, molding cycles are shortened and productivity is improved as compared with those in using a curing catalyst of a high-concentration curing system. Furthermore, molding shrinkage is improved by action of the ethanol and cloudiness and waviness due to the molding shrinkage are not caused in the molded product in the form of the bathtub.
Patent JP-H04210439-A (JP)
Title: High strength copper alloy having satisfactory hot workability
Inventor: EGUCHI TATSUHIKO
IPC: C22F1/00
Filed: 1990-12-11
Abstract: PURPOSE:To prevent the cracking of a Cu-Ni-Si based alloy at the time of hot working and to enhance the yield of hot rolled products by regulating the P content of the alloy to a specified range and the grain size of a casting of the alloy to a specified value or below. CONSTITUTION:The P content of a Corson alloy having a compsn. consisting of 2.0-4.0wt.% Ni, 0.4-1.0wt.% Si and the balance Cu is regulated to 0.01-0.05wt.%, 0.05-1.0wt.% Zn is incorporated into the Cu alloy as necessary and the grain size of a casting of the Cu alloy is regulated to <=10mm. The hot rollability of the Cu alloy is improved to prevent cracking at the time of hot rolling and the yield of electrical and electronic equipment parts made of the alloy is considerably enhanced.
Patent JP-H04215251-A (JP)
Title: Nonaqueous electrolyte secondary battery
Inventor: OGINO TAKAO
IPC: H01M4/505
Filed: 1990-12-10
Abstract: PURPOSE:To obtain a nonaqueous electrolyte secondary battery with a high discharge capacity, high voltage and excellent charge/discharge cycle characteristics. CONSTITUTION:In a nonaqueous electrolyte secondary battery having a positive electrode, a negative electrode which can adsorb or desorb lithium, and a nonaqueous electrolyte containing lithium ions, a lithium-vanadium composite oxide expressed by LixV2O5 (0.03<=x<=0.15) and having main peaks at 2theta=17.0 deg.+ or -0.5 deg., 20.2+ or -0.5 deg., 21.7 deg.+ or -0.5 deg. respectively in the X-ray diffraction by CrKalpha rays as shown by C-E in the figure.
Patent JP-H04213986-A (JP)
Title: Amplifier for catv system
Inventor: NAKADA MINORU
IPC: H04N5/00
Filed: 1990-12-12
Abstract: PURPOSE:To offer the amplifier for CATV system able to offer information to a communication line system even for a long time power failure in excess of the compensation time by a spare power supply device. CONSTITUTION:A bypass circuit 2 is provided to the amplifier, which bypasses a signal as it is not through an amplifier circuit 1. The bypass circuit 2 consists of a path line 5 short-circuiting the input and output and a bypass relay 6 switching the signal path to the position of the amplifier circuit 1 or the position of the pass line 5. Moreover, the bypass circuit 2 is provided to both the amplifier circuit for a trunk line and the amplifier circuit for a branch line.
Patent JP-H04279832-A (JP)
Title: Physical quantity measurement device
Inventor: UIRIAMU UEIN MOORII
IPC: G01D5/353
Filed: 1990-12-21
Abstract: PURPOSE: To design a sensing device having a simple construction, manufacturable at a cheap cost, usable easily, and capable of reliable operation by using a single optical fiber containing a large number of buried Bragg lattices in which data representing a monitoring quantity are buried, and remarkably increasing the number of positional stresses which can be reliably collected. CONSTITUTION: A physical quantity measuring device is composed of a thin and long optical fiber 10 having wave-guide cores and containing Bragg sensing lattices G1 -Gm , a means for applying a longitudinal-direction stress depending on the range of the shift of each physical quantity under monitoring, a means for emitting a light pulse to the cores having a means for controlling its light emitting time so as to coincide with at least all the central wavelengths, a means for guiding a light echo to a detecting position separated from the optical fiber 10, a means for detecting the light echo when the light echo reaches the detecting position and responding it and outputting a series of detected signals, and a means for allocating the detected signals to the sensing lattices G1 -Gm and the longitudinal-direction stresses.
Patent JP-H04225351-A (JP)
Title: Process control method for processing photosensitive material
Inventor: NAKABAYASHI HIROMITSU
IPC: G03C1/00
Filed: 1990-12-26
Abstract: PURPOSE:To judge processing ability of each step of process for processing photosensitive material simply and accurately. CONSTITUTION:A magnetic recording in a standard film F for control strips which is settled of exposure is read by a record reading head 14 and a temperature control means 28, a supplementary equipment 29 and a drying part 24 in each processing vessel are controlled by a control equipment 30 based on the magnetic recording. After the standard film F for control strips is developed, finished state is judged by a judging means 31 comparing informations of standard finished state magnetically recorded in standard film F for control strips and critical finished state, and processing ability in each step of process is judged.
Patent JP-H06226507-A (JP)
Title: Cutting work device for forming cylindrical face on workpiece
Inventor: BIRUFURIITO GERUKU
IPC: B23B19/02
Filed: 1990-12-28
Abstract: PURPOSE: To adjust a position of a cutting tool for forming a desired accurate cylindrical machining surface in the axial direction and the circumferential direction. CONSTITUTION: An inclination angle adjusting means for inclining a cutting tool holder 4 is mounted between the bite holder 4 on which a cutting tool 12 is mounted and a support means connected with the cutting tool holder 4. The desired controlled pressure PST is generated by a pressure adjusting means 20 to which the pressurized fluid is supplied at all times on the basis of a signal from a stroke.rotary angle detecting means 56 detecting the feeding amount and the rotation angle of the cutting tool 12. The controlled pressure acts on the inclination angle adjusting means for displacing the cutting tool 12 by a unit of several μm. Whereby a cylindrical hole 18 formed on a work 16 and an outer surface of a rotary body can be precisely cut.
Patent JP-S63501709-A (JP)
Title: ガスノズル組み立て体
IPC: F26B13/20
Filed: 1986-11-28
Abstract: (57)【要約】本公報は電子出願前の出願データであるため要約のデータは記録されません。
Patent JP-S63501454-A (JP)
Title: データプロセッサ制御装置
IPC: G06F9/46
Filed: 1986-11-10
Abstract: (57)【要約】本公報は電子出願前の出願データであるため要約のデータは記録されません。
Patent JP-H10501563-A (JP)
Title: 発泡性ビーズのための被覆組成物
IPC: C08J9/228
Filed: 1995-06-02
Abstract: (57)【要約】
本発明は、発泡性ビーズ、特に発泡剤を含有するビニル芳香族化合物のポリマーよりなる発泡性ビーズを被覆するための、２００〜１５，０００の範囲の重量平均分子量（Ｍ w ）を有するビニル芳香族化合物の低分子量ポリマーの使用に関するものである。さらに本発明は、この種のビーズのための被覆組成物、被覆された発泡性ビーズおよび被覆された発泡性ビーズの予備発泡により作成される予備発泡ビーズ、並びに発泡剤の沸点およびポリマーの軟化点よりも高い温度で熱処理してこれらビーズを発泡および融合させることにより作成される物品に関するものである。
Patent JP-H03500048-A (JP)
Title: 癌、自己免疫疾患または感染症の診断、モニター、治療および／または予防のための抗イディオタイプ抗体を選択するための方法および手段ならびにその用途
IPC: G01N33/569
Filed: 1988-11-30
Abstract: (57)【要約】本公報は電子出願前の出願データであるため要約のデータは記録されません。
Patent JP-2002509451-A (JP)
Title: キレート剤ベースの防臭系を有する通気性吸収製品
IPC: A61L15/18
Filed: 1997-05-23
Abstract: (57)【要約】
本発明は、通気性バックシートを有し、且つキレート化材を含む防臭系を備えた、生理用ナプキンおよびベビー用おむつのような通気性吸収の吸収性製品に関する。通気性および防臭系の組み合わせは、改善された防臭特性を与える。
Patent JP-H06510364-A (JP)
Title: 改良形小形トランスポンダ
Inventor: ZIRBES GLEN LEO
IPC: H01Q7/08
Filed: 1992-06-05
Abstract: (57)【要約】本公報は電子出願前の出願データであるため要約のデータは記録されません。
Patent JP-H06504878-A (JP)
Title: 珪素ウェーハ中の析出状態を制御する方法
IPC: H01L21/02
Filed: 1991-11-11
Abstract: (57)【要約】本公報は電子出願前の出願データであるため要約のデータは記録されません。
Patent JP-H06501599-A (JP)
IPC: H04R/
Filed: 1991-11-07
Abstract: The disclosure describes a contact transducer assembly (98) for an electromagnetically driven hearing device such as a hearing aid or other audio signal reproducing device worn by a user. The contact transducer assembly (98) includes a transducer (100) which is attached to a biocompatible support (102). This assembly is supported on the tympanic membrane of the wearer by surface adhesion, such that it can be readily inserted and removed in a manner similar to that of a conventional contact lens worn on the eye.
Patent JP-H04503681-A (JP)
Title: 新規１―トリアコンタノール誘導体
IPC: A61P3/00
Filed: 1990-12-18
Abstract: (57)【要約】本公報は電子出願前の出願データであるため要約のデータは記録されません。
Patent JP-H06508553-A (JP)
IPC: C12N1/00
Filed: 1992-06-17
Abstract: Disclosed is a method of decontaminating soil by applying to the soil an oxygen delivery vehicle such as peroxides of calcium, potassium or magnesium or mixture thereof in an amount which substantially increases the population of microorganism in the soil that digest pollutants. Preferably, a surfactant and an oxygen releasse rate modifier are also included.
Patent JP-H04506374-A (JP)
IPC: C09D17/00
Filed: 1990-12-17
Abstract: PCT No. PCT/EP90/02211 Sec. 371 Date Jul. 28, 1992 Sec. 102(e) Date Jul. 28, 1992 PCT Filed Dec. 17, 1990 PCT Pub. No. WO91/09917 PCT Pub. Date Jul. 11, 1991.In order to increase the stone chip resistance of automobile finishes aqueous electrocoating paints are used which are produced by the use of a pigment paste which contains as grinding resin an at least partially protonated epoxide-amine adduct which is obtainable by reacting (A) a glycidyl ether of a polyphenol which contains on statistical average at least one epoxide group in the molecule, or a mixture of such glycidyl ethers, (B) a polyglycidyl ether of a polyol which contains on statistical average more than 1.0 epoxide groups in the molecule, or a mixture of such polyglycidyl ethers, and (C) a compound which contains a primary amino group in the molecule or a mixture of such compounds with each other in such a stoichiometric ratio that an epoxide-amine adduct is obtained in which on statistical average at least 2.0 primary amino groups of the component (C) are incorporated in a chain-extending function with the formation of tertiary amino groups and the resultant epoxide-amine addict is at least partially protonated.
Patent JP-H10513613-A (JP)
Title: デュアルラッチのクロックドｌｓｓｄおよび方法
IPC: H03K3/037
Filed: 1994-04-22
Abstract: (57)【要約】
少なくとも３つの動作モードで動作するように、スレーブラッチ（１４）に結合されるマスタラッチ（１２）を含むデュアルラッチのクロックドＬＳＳＤ（１０、Ｅ）が設けられた、ディジタル集積回路。好ましくはデュアルラッチのクロックドＬＳＳＤの３つのモードは、機能モード、捕捉モード、およびシフトモードを含む。機能モードにおいては、デュアルラッチのクロックドＬＳＳＤはエッジトリガフリップフロップ記憶素子として動作する。捕捉モードにおいては、デュアルラッチのクロックドＬＳＳＤは、システムクロック（ＣＬＫ）、２つのスキャンクロック信号のうちの１つ、および好ましくはテストモード入力信号によって制御されるレベルセンシティブラッチ記憶素子として動作する。シフトモードにおいては、デュアルラッチのクロックドＬＳＳＤは再びレベルセンシティブラッチ記憶素子として動作するが、１対のシフトクロックによって制御される。機能モードから捕捉モード分けることによって、デュアルラッチのクロックドＬＳＳＤは捕捉モードおよびシフトモードの両方においてスキュー問題に対し非常に耐性がある。
Patent JP-H09502300-A (JP)
Title: 低圧ナトリウム放電ランプ
IPC: H01J61/74
Filed: 1995-06-12
Abstract: (57)【要約】
低圧ナトリウム放電ランプは、中にＵ字状の放電管（10）が収容されている外被（１）を有する。放電管のステムつまみ（11）が延在する穴（21）を有する雲母円盤（20）がその放電管を中心に維持する。雲母円盤（20）はそれの周辺に歯（22）を有し、それらの歯はランプ口金（５）に向かって曲げられて外被と締めつけるように噛み合う。この雲母円盤は外被に対して滴下密封処理で朝顔形に広がった管（３）へ融合されることを許容し、幾つかの付加的な特徴を与える。
Patent JP-H10509331-A (JP)
Title: 生理的な波形の電子的表示方法及び装置
IPC: A61B5/044
Filed: 1995-06-08
Abstract: (57)【要約】
生理的な信号を電子表示する装置は、生理的な信号を検出する手段（２０）と、心電図記録用紙又は他の生理的な記録用紙の表記を有する２次元格子形状のパターンを生成し、且つ生理的な信号を格子形状のパターン上に重ねるコンピュータ手段（２２）と、生理的な信号を格子形状のパターン上に表示するビデオ表示スクリーン（２４）とを備える。
Patent JP-H04500991-A (JP)
Title: デユアル機能作動器を備えたターボチヤージヤ
IPC: F02B37/24
Filed: 1989-02-09
Abstract: (57)【要約】本公報は電子出願前の出願データであるため要約のデータは記録されません。
Patent JP-2000512983-A (JP)
IPC: C07D311/76
Filed: 1997-05-21
Abstract: PCT No. PCT/GB97/01391 Sec. 371 Date Dec. 14, 1998 Sec. 102(e) Date Dec. 14, 1998 PCT Filed May 21, 1997 PCT Pub. No. WO97/48692 PCT Pub. Date Dec. 24, 19973-Isochromanone is prepared by reacting o-tolyacetic acid with sulphuryl chloride in the presence of a free radical initiator, e.g. AIBN, followed by ring closure of the 2-chloromethylphenylacetic acid so formed with a base, e.g. potassium bicarbonate.