baber/WOPTO huggingface dataset:
Patent IT-1249827-B (IT)
Title: Materiale composito per il filtraggio dell'aria
Inventor: MASUDA TAKUICHIRO
IPC: D04H1/498
Filed: 1991-08-02
Granted: 1995-03-28
Abstract: Un materiale di filtrazione dell'aria scambiabilmente attaccato ad un filtro dell'aria per uso domestico o di una automobile comprende un tessuto non tessuto di tipo a getto d'acqua ad un lato di uscita dell'aria e un altro tipo di tessuto non tessuto o complesso di fibre ad un lato di ingresso dell'aria. Questi fogli in tessuto non tessuto vengono laminati l'uno sull'altro mediante punzonatura ad aghi. Il tessuto non tessuto di tipo a getto d'acqua è fabbricato a partire da fibre più sottili affollate, e i morsetti formati in esso dalla penetrazione degli aghi di una macchina di punzonatura ad aghi possono essere riempiti muovendo centripetamente fibre che circondano i morsetti.
Patent IT-1250970-B (IT)
Title: Memory card with capacitive coupling and interface circuit to be used in it and in co-operation with it
Inventor: MAROTTA GIULIO
IPC: G06F/
Filed: 1991-12-19
Granted: 1995-04-24
Abstract: The subject of the invention is a memory card comprising a small number of resistive contacts for the application of dc voltages and the clock signal, as well as a plurality of capacitor plates to which go a similar plurality of interface circuits, which plates and which interface circuits co-operate with an identical plurality of mirror-image capacitor plates and interface circuits provided in the card driver associated with the apparatus with which the memory card is to be used. The interface circuits comprise a receiving-transmitting assembly RXTX, followed by a demodulation assembly consisting of two demodulator circuits in parallel DEMOD, DEMODB, with the outputs combined in an OR arrangement via a NOR gate circuit NOR1 and an attached inverter circuit INV6. (Figure 1) <IMAGE>
Patent IT-1263008-B (IT)
Title: Procedimento per aumentare la resa negli impianti di produzione di melammina.
Inventor: CASSARINO SALVATORE
IPC: C07D/
Filed: 1992-10-15
Granted: 1996-07-23
Abstract: Per migliorare la resa negli impianti di produzione della melammina, la corrente gassosa di ammoniaca, è inviata ad una colonna di frazionamento multistadio, nella quale detta corrente gassosa viene a contatto in controcorrente con l'urea fusa utilizzata come materia prima per la produzione di melammina. Detta corrente gassosa di ammoniaca è inviata alla colonna di frazionamento ad una temperatura supercritica compresa nell'intervallo da 130°C fino a 160°C, preferibilmente da 138°C a 150°C, mentre la portata è compresa tra i valori da 0,1 fino a 1,0 Nm3 per Kg di urea, e di preferenza da 0,15 a 0,35 Nm3 per Kg di urea. Durante il contatto tra ammoniaca ed urea fusa, la acqua presente nell'urea fusa viene rimossa dall'ammoniaca gassosa e l'assenza di acqua nell'urea fusa inviata al reattore di sintesi della melammina riduce la formazione di sottoprodotti con conseguente aumento dell'efficienza di conversione a valori compresi tra il 94 ed il 97%.
Patent IT-1261447-B (IT)
Title: Dispositivo di regolazione della pressione di frenatura per ottimizzare l'usura delle guarnizioni in un autoveicolo.
IPC: F16D66/02
Filed: 1993-04-21
Granted: 1996-05-23
Abstract: Viene descritto un dispositivo di controllo della pressione frenante con una valvola del freno di esercizio per la guida della pressione da una sorgente di riserva e tramite un regolatore di forza frenante (regolatore ALB) automaticamente - dipendente dal carico - ai cilindretti dei freni delle ruote di un assale posteriore e da una sorgente di riserva ai cilindretti dei freni delle ruote di un assale anteriore di un autoveicolo che, inoltre, presenta sensori di usura per il rilevamento dei rispettivi spessori residui delle guarnizioni dei freni, dove i segnali di uscita dei sensori di usura vengono inviati ad un sistema elettronico di comando che, in presenza di usura differente delle guarnizioni di entrambi gli assali, genera un segnale per l'attivazione di una valvola elettromagnetica, mediante la quale la pressione frenante dei freni delle ruote di un assale può essere corretta. Invece di eseguire una correzione della pressione frenante di volta in volta sui freni delle ruote dell'assale, che rispetto ai freni delle ruote dell'altro assale presentano una usura più forte, secondo l'invenzione una correzione della pressione frenante ha luogo sempre soltanto sui freni delle ruote di un assale (VA oppure HA), dove solo a questo assale è associata una valvola elettromagnetica.
Patent IT-1260611-B (IT)
Title: Materiale di carburo di tungsteno ad alta resistenza per l'impiego in punte per trivellazione
IPC: C22C29/08
Filed: 1993-02-26
Granted: 1996-04-22
Abstract: Pastiglie di metallo duro sinterizzato destinata all'impiego nelle punte per trivellazione che comprende dall'80 al 94% in peso di parti celle di carburo di tungsteno, dal 5,4 al 18% in peso di particelle di cobalto e da 0,6 a 2,0% in peso di particelle di nichel, in cui il rapporto ponderale tra cobalto e nichel è all'incirca di 9:1. Questi materiali vengono prodotti secondo le tecniche convenzionali di metallurgia delle polveri ottenendo una pastiglia sinterizzata dura destinata all'impiego nelle punte da trivellazione e che presenta proprietà superiori nelle applicazioni alla perforazione.
Patent IT-1260623-B (IT)
Title: Elemento profilato di protezione per spazzole tergicristallo.
IPC: B60S1/38
Filed: 1993-03-10
Granted: 1996-04-22
Abstract: L'elemento (10) presenta una configurazione a ? o Y, con due rami laterali (12) destinati ad abbracciare in rapporto di aggancio saldo l'elemento tergente (6) della spazzola (4) tergicristallo ed una parte appendicolare (12) destinata, nell'uso, ad estendersi verso il cristallo in funzione di elemento tergente. Di preferenza, l'elemento è ottenuto per coestrusione di un materiale plastico destinato a costituire i rami laterali (12) di aggancio alla spazzola (5) e di un materiale simile alla gomma, tipicamente una gomma termoplastica, destinata a costituire la suddetta parte appendicolare (12).(Figura 3)
Patent IT-1259761-B (IT)
Title: Tacking machine for plates to be drawn
IPC: B23D/
Filed: 1992-04-29
Granted: 1996-03-26
Abstract: A punch for reducing the thickness and width of a plate P, automatically, characterised by the fact that it includes: an entrance station 1 for the head of the laminate P with means for cutting it with vertical shears (2,21-210,22) to make a straight diagonal or tapered cut by removing a corner from the end of the laminate P1; a rolling station 3 for the said plate in a fixed position, produced by a rolling cage moving alternately in a longitudinal direction 30 and fitted with rolling rollers 34-35 caused to rotate to produce rolling at the end of the said plate P2-P3, by means of advancing the said cage 30 that produces a peripheral rotation speed of the said rolling rollers 34-35 equal to the speed of advance of the said cage 30 and the rolling rollers 34-35 being provided with a portion of reduced radius so as not to interfere with the advance of the plate being inserted between the said rollers after the said cutting of the taper, when the said cage 30 is moved upwards. (Fig. 4) <IMAGE>
Patent ME-01365-B (ME)
Title: Data carrier and method for producing same
Inventor: CHRISTEN PAUL
IPC: B42D15/10
Filed: 2000-03-09
Abstract: The data carrier is preferably an identity card or payment card and is provided with at least one layer forming a card body, a transparent outer layer laminated thereon and a planar security element that is arranged between two laminated layers and that is covered by a protective layer. At least one of the laminated layers is transparent. The security element laminated therein is provided with especially holographic or kinegraphic information and is particularly protected against damage.
Patent MX-167421-B (MX)
Title: Procedimiento para la obtencion de fosgeno bajo generacion simultanea de vapor
Inventor: SAUER HEINZ
IPC: C01B32/80
Filed: 1984-07-18
Abstract: La presente invención se refiere a procedimiento para la obtención de fosgeno mediante reacción de cloro con monóxido de carbono en reactores de tubos conteniendo carbón activo como catalizador, bajo aprovechamiento simultáneo del calor de reacción que se forma para la generación de vapor.
Patent PT-100642-B (PT)
Inventor: GOLDNER WOLFGANG
IPC: C09D159/00
Filed: 1992-06-30
Abstract: PCT No. PCT/AT92/00093 Sec. 371 Date Mar. 10, 1994 Sec. 102(e) Date Mar. 10, 1994 PCT Filed Jul. 10, 1992 PCT Pub. No. WO93/01245 PCT Pub. Date Jan. 21, 1993.The invention relates to a process for producing water-dilutable varnish binders and their use in manufacturing water-dilutable fillers for automobile paintwork. The binders contain a reaction product, which is dilutable with water after the neutralization of the carboxyl groups, of a polyurethane resin having carboxyl groups and at least one terminally blocked isocyanate group (polycarboxyl component) with a polyester having a hydroxyl group (polyhydroxyl component) and a cross-linking component. Further improvements in the shelf-life of the varnishes can be attained by specially selecting the binder components and special processing steps for the combination thereof.
Patent PT-104875-B (PT)
Title: Método para a determinação da ocorrência do efeito de fusível em redes ópticas e monitor correspondente
Inventor: ANDRE PAULO SERGIO DE BRITO
IPC: H04B10/075
Filed: 2009-12-11
Abstract: O PRESENTE INVENTO DIZ RESPEITO A UM MÉTODO PARA A DETERMINAÇÃO DA OCORRÊNCIA DO EFEITO DE FUSÍVEL EM REDES ÓPTICAS PARA IDENTIFICAR UNIVOCAMENTE A PRESENÇA DO EFEITO DE FUSÍVEL E PROVIDENCIAR SINAIS DE ALERTA QUE DESPOLETEM ACÇÕES PARA A SUA MITIGAÇÃO. É ESSENCIALMENTE CARACTERIZADO POR UTILIZAR PELO MENOS UMA REDE DE DIFRACÇÃO ESCRITA EM FIBRAS ÓPTICAS COMO SENSORES DE TEMPERATURA, COLOCADAS EM CONTACTO EXTERNO EM PONTOS DA FIBRA ÓPTICA A MONITORIZAR. COMPREENDER A SEGUINTE SEQUÊNCIA:- VERIFICAÇÃO DA MEIA LARGURA A MEIA ALTURA DO IMPULSO MEDIDO NA REDE DE DIFRACÇÃO E A COMPARAÇÃO COM UM INTERVALO EXPECTÁVEL COM OS VALORES DADOS PELA EXPRESSÃO T2 = L/(2V) SENDO T2 A MEIA LARGURA A MEIA ALTURA, L O COMPRIMENTO DA REDE DE DIFRACÇÃO E V A VELOCIDADE DE PROPAGAÇÃO DA ONDA TÉRMICA, OU CASO L/(2V) < 20 F A EXPRESSÃO T2<20/F ONDE F É A TAXA DE AMOSTRAGEM DO SISTEMA DE INTERROGAÇÃO;- COMPARAÇÃO DO INTERVALO TEMPORAL DE IMPULSOS NO CASO DE DUAS REDES DE DIFRACÇÃO ESCRITAS COM O VALOR DADO PELA EXPRESSÃO ¿T = V/D SENDO V A VELOCIDADE DE PROPAGAÇÃO DA ONDA TÉRMICA E D O ESPAÇAMENTO ESPACIAL ENTRA AS DUAS REDES - CASO SE CONFIRME UNIVOCAMENTE A PRESENÇA DE UMA ONDA TÉRMICA, PROVIDENCIAR SINAIS DE ALARME PARA ACTIVAR OS PROCESSOS DE MITIGAÇÃO/CONTENÇÃO, NOMEADAMENTE, DO ALARME APS (AUTOMATIC POWER SHUTDOWN) DOS EMISSORES DAS REDES ÓPTICAS.O INVENTO REFERE-SE AINDA A UM MONITOR PARA LEVAR A CABO O REFERIDO MÉTODO.
Patent PT-115444-B (PT)
Title: Processo de produção de bebida fermentada e bebidas fermentadas assim obtidas
Inventor: FERNANDO DOS ANJOS FERREIRA
IPC: A23L2/38
Filed: 2019-04-09
Abstract: A PRESENTE INVENÇÃO DIZ RESPEITO A DIFERENTES MODALIDADES DE UM PROCESSO DE PRODUÇÃO DE BEBIDAS FERMENTADAS COMPREENDENDO UMA ETAPA DE MISTURA (1) DE UM MATERIAL PARTICULADO DE ORIGEM VEGETAL GERMINADO E MALTADO, ÁGUA E UM CARBOIDRATO, CONDUZINDO-SE SUBSEQUENTEMENTE UMA ETAPA DE COZIMENTO (2) DA DITA MISTURA E UMA ETAPA DE FERMENTAÇÃO (3). OS PROCESSOS COMPREENDEM ADICIONALMENTE ETAPAS DE ADIÇÃO DE ADITIVOS (4), DE SEPARAÇÃO DE SÓLIDOS (5), DE TRATAMENTO TÉRMICO (7) E DE ARREFECIMENTO (8), AS QUAIS PODEM SER EFETUADAS COM SEQUÊNCIAS ALTERADAS, CONFORME AS DIFERENTES MODALIDADES DA INVENÇÃO. A PRESENTE INVENÇÃO TAMBÉM DIZ RESPEITO ÀS BEBIDAS FERMENTADAS OBTIDAS PELAS DIFERENTES MODALIDADES DO PROCESSO DE PREPARO DAS BEBIDAS. O PROCESSO DE PRODUÇÃO DA INVENÇÃO PROPICIA O PREPARO DE BEBIDAS FERMENTADAS PADRONIZADAS E ESTÁVEIS, EM TERMOS DO TEMPO DE VIDA NA PRATELEIRA.
Patent RO-90462-B (RO)
Inventor: GROSU ISIDOR
IPC: A61K9/20
Filed: 1984-08-11
Abstract: Inventia se refera la un produs medicamentos fitoterapeutic antihipertensiv, sedativ si tonic-cardiac, este constituit din 8,5% extract din Herba Visci alb, 7,1 extract din Folium si Flores Crataegi 4,2% extract din Herba Leonuri Cardiaca, 5,7% extract din Herba Equiseti4,2% rutina, 40,7% lactoza, 21,4% amidon, 1,4% gelatina, 2,8% aerosil, 0,28% tween, 2,2% talc, 1,1% stearat de magneziu conditionat sub forma de comprimare.
Patent RO-100542-B (RO)
Inventor: MIHAILESCU LAURENTIU ELEADOR
IPC: D06P1/44
Filed: 1988-01-18
Abstract: Compozitia, conform inventiei, consta în aceea ca în scopul conferirii unui aspect vizual deosebit al tesaturilor imprimate si un grad superior de uniformizare a gonflarii, se compune din 25...35% policlorura de vinil, 3...16% agent gazogen, 4...25% catalizator pentru uniformizarea descompunerii agentului gazogen si reglarea temperaturii la care are loc procesul de expandare, 27...35,8% pladtifiant, 15...26% agent de stabilizare termica a polimerului la temperatura de gelifiere si f'gonflare, colorant insolubil în plastifiant, 1...5% produs pentru stabilizarea în domeniul elastic al plastisolului obtinut.
Patent TW-294798-B (TW)
Title: Method of generating character with variable stroke width
Inventor: WU MING-HWA
IPC: G06T11/20
Filed: 1992-09-01
Granted: 1997-01-01
Abstract: A method of generating character with variable stroke size comprises of: (1) finding character stroke skeleton; (2) by segment on two sides installing multiple control points to control the stroke skeleton width, so as to form character image with many variable width.
Patent TW-250477-B (TW)
IPC: C07C317/42
Filed: 1993-11-08
Granted: 1995-07-01
Abstract: Benzoylguanidines of the formula I <IMAGE>     where R(1) is hydrogen, Hal, -NO2, -CN, -CF3, R(4)-SOm or R(5)R(6)N-SO2-, where m is zero to 2, R(4) and R(5) are alk(en)yl or -CnH2n-R(7), n is zero to 4, with R(5) also having the meaning of H, and R(6) is H or (C1-C4)-alkyl, with R(5) and R(6) together being able to be 4 or 5 methylene groups,   R(2) is -SR(10), -OR(10), -NHR(10), -NR(10)R(11), -CHR(10)R(12), <IMAGE>     with R(10) and R(11) being identical or different and being -[CHR(16)]s-(CH2)p-(CHOH)q-(CH2)r-(CH2OH)t-R(21) or -(CH2)p-O(CH2-CH2O)q-R(21), R(12) and R(13) being hydrogen or alkyl, or forming a cycloalkyl together with the carbon atom carrying them,   R(14) being H, (cyclo)alkyl or -CnH2n-R(15),   R(3) is defined as R(1) or is alkyl, hydrogen or -X-R(22), where X is oxygen, S or NR(16),  are described, as are the pharmaceutically tolerated salts thereof. The compounds I possess very good anti-arrhythmic properties but do not have any undesirable salidiuretic properties. In addition to this, they are notable for their strong inhibitory effect on the proliferation of cells.
Patent TW-223195-B (TW)
Title: Method and apparatus to detect additional functions of keypad
Inventor: WU CHYI-CHANG
IPC: H04M1/54
Filed: 1993-11-23
Granted: 1994-05-01
Abstract: A method to detect additional functions of keypad by using the existingI/O ports to detect the states of resistors attached to the ports, wherethe state is connected to power, ground or floating, comprises thefollowing steps: 1. Whenever a keypad is depressed, the output of the keypad scanningcircuit is hold for a period of time; 2. During the period, proceeding detecting the attached resistors'statesfor column I/O ports or row I/O ports and sending the detected data toa memory device for deciding the attached resistors' states for columnI/O ports or row I/O ports; 3. Stopping detecting the attached resistors' states and releasing thekeypad scanning circuit to continue the scanning.
Patent TW-224543-B (TW)
Title: Flash memory
Inventor: HORNG YEUN-DING
IPC: H01L27/115
Filed: 1994-02-22
Granted: 1994-06-01
Abstract: One type of manufacturing method for flash memory with split-gateconsists of: 1. providing one silicon substrate with field oxide layer and component area; 2. sequentially forming the tunnel oxide layer, the first polysiliconlayer, the first dielectric layer with ONO structure, the secondpolysilicon layer and one Nitride layer; 3. putting photo-resistance and overlaying the area which is to be formedas floating gate, then sequentially etching the exposed Nitride layer,the second polysilicon layer, the dielectric layer with ONO structureand the first polysilicon layer to form floating gate, then removingthe photo-resistance; 4. forming the second dielectric layer with ONO structure with anisotropicetching to etchback in order to form spacer dielectric layer with ONOstructure on the remaining spacer of the first polysilicon layer, thefirst dielectric layer with ONO structure, the second polysiliconlayer and Nitride layer; 5. etching the exposed tunnel oxide layer out of the floating gate area; 6. forma gate oxide layer; 7. etching the remaining Nitride layer; 8. depositing the third polysilicon layer and molding to word line controlgate; 9. providing appropriate metallurgy to connect the integrated circuit offlash memory needed by component forming.
Patent TW-267156-B (TW)
IPC: A61K31/445
Filed: 1994-06-22
Granted: 1996-01-01
Abstract: The invention concerns acid derivatives of formula I R<1>-CON(R<2>)-N(R<3>)CO-X<1>-Q-X<2>-G   I and pharmaceutically acceptable metabolically labile esters or amides thereof, and pharmaceutically acceptable salts thereof, wherein R<1> represents a group of formula II or III <CHEM> in which A is attached meta or para to the position where the group CONR<2>NR<3>CO is attached and is selected from aminomethyl, guanidino and R<a>N=C(NH2)-  T is N or CH, and  X<3> is a bond, (1-4C)alkylene or, when T is CH, oxy(1-3C)alkylene; R<2> and R<3>, which may be the same or different, represent hydrogen, (1-4C)alkyl or ar(1-4C)alkyl;  X<1> is a bond or (1-4C)alkylene;  Q is a group of formula IV or V <CHEM> X<2> is a bond, (1-4C)alkylene, oxy(1-3C)alkylene or a group of formula CH2CH(NHXR<4>) in which X is SO2, CO or CO2 and R<4> is (1-6C)alkyl, (6-12C)aryl or (6-12C)aryl(1-4C)alkyl in which the aryl group may optionally be substituted by (1-4C)alkyl; and  G is a carboxy group. The invention also concerns processes for the preparation of the acid derivatives of formula I, pharmaceutical compositions containing them and their use as inhibitors of the binding of fibrinogen to glycoprotein IIb/IIIa.
Patent TW-326394-B (TW)
Title: Insulin formulation
Inventor: JAMES ARTHUR HOFFMANN
IPC: A61P3/10
Filed: 1994-08-09
Granted: 1998-02-11
Abstract: A human insulin formulation comprising a suspension of Ultralente human insulin crystals and a total formulation zinc concentration of between 0.5 milligrams to 20 milligrams per 100 units of human insulin, having a pH from between 6.0 to 7.4.
Patent TW-241347-B (TW)
Title: Load detector
Inventor: HWANG JIUNN-DONG
IPC: G06F11/30
Filed: 1994-10-05
Granted: 1995-02-21
Abstract: A load detector includes: 1. one load connector for connecting one load device and supplying power; 2. one load potential adjusting device, electrically connected to the load connector, responding to one potential adjusting signal with adjusting the potential used by the connecting load device; 3. one load sensing device, electrically connected to the load connector and the load potential adjusting device, responding to the potential change generated by the load connector with outputting the potential adjusting signal and one load existence signal.
Patent TW-256972-B (TW)
IPC: H04J9/00
Filed: 1995-03-03
Granted: 1995-09-11
Abstract: A broadcasting method for simultaneously broadcasting analog and digital signals in a standard AM broadcasting channel is provided by: broadcasting an amplitude modulated radio frequency signal having a first frequency spectrum, wherein the amplitude modulated radio frequency signal includes a first carrier modulated by an analog program signal; and simultaneously broadcasting a plurality of digitally modulated carrier signals within a bandwidth which encompasses the first frequency spectrum, each of the digitally modulated carrier signals being modulated by a portion of a digital program signal, wherein a first group of the digitally modulated carrier signals lying within the first frequency spectrum are modulated in-quadrature with the first carrier signal, and wherein second and third groups of the digitally modulated carrier signals lie outside of the first frequency spectrum and are modulated both in-phase and in-quadrature with the first carrier signal. Transmitters and receivers which operate in accordance with the above method are also provided.
Patent TW-266191-B (TW)
Title: Disc brake
Inventor: IWASHITA CHO
IPC: F16D55/02
Filed: 1995-05-25
Granted: 1995-12-21
Abstract: A disc brake, which mainly comprises: a disc rotor (24), a caliper (21) on the outer circumference of the disc rotor (24), a pair of friction pads (321, 322) installed between the two sides of the disc rotor (24) and the caliper (21), a unitary suspension pin (38) installed parallel to the rotation axis of the disc rotor (24) and used to support the two friction pads (321, 322), and a pad spring (40) which activates the two friction pads (321, 322) toward the rotation center of the disc rotor (24) and is installed between the two friction pads (321, 322) and the caliper (21); which is characterized in that: the unitary suspension pin (38), which supports the outer circumference of the two friction pads (321, 322), is installed on the caliper (21); and the pad spring (40) is installed with a rotating-in spring section (40b), a rotating-out spring section (40c), and pad contact sections (43, 45).
Patent TW-369593-B (TW)
Title: Intake fan apparatus having a reverse fan
Inventor: OKAZAKI HAJIME
IPC: F24F7/06
Filed: 1996-02-12
Granted: 1999-09-11
Abstract: This invention relates to an intake fan apparatus having a reverse fan for use indoors of apartment buildings and others having opposite rotation blades in reverse rotation as intake fan apparatus having a reverse fan, providing an intake fan apparatus for obtaining desired air volume, formed by an air fan that leads indoor air to the outdoor air duct as an air flow channel, and an air fan disposed in the air channel, featuring: said air fan formed by the reverse fan disposed in said air flow direction crossing the opposite blade in reverse rotation, for the outdoor end disposed in said air flow channel taking indoor air for discharge outdoors.
Patent TW-382007-B (TW)
Title: Cristobalite-contained silica glass, method of producing same and silica glass jig made of same
Inventor: INAKI KYOICHI
IPC: C03C14/00
Filed: 1996-02-28
Granted: 2000-02-11
Abstract: An object of the present invention is to provide silica glass having high purity high heat resistance large coefficient of thermal expansion, and low light transmittance and a method of producing the same. another object of the present invention is to provide a silica glass jig with a vapor-deposited film thereon. Cristobalite-contained silica glass wherein alpha-cristobalite in the shape of a small sphere or a small round-edged or sharp-edged three-dimensional region is dispersed in the silica glass matrix the diameter of each alpha-cristobalite sphere or region is in the range of 0.1 Mm to 1000 Mm and a content of the alpha-cristobalite is 10-99 wt %. A method of producing the cristobalite-contained silica glass by heating a mixture of two kinds or more of crystalline silicon dioxide powder the melting points of which silicon dioxide are different from each other by 20 degree C or more wherein the mixture contains the silicon dioxide having the highest melting point at a content in the range of 10 wt % to 80 wt % is heated at temperatures in the range of the lowest melting point of the ingredients to a temperature lower than the highest melting point. The silica glass jig is made of the cristobalite-contained silica glass and the surface of the jig is covered with a vapor-deposited thin film which has a property of being resistant to plasma etching and which is made of a material of almost the same coefficient of thermal expansion as that of the silica glass. The silica glass jig has no chance to generate particles therefrom and thereby to contaminate a silicon wafer.