baber/WOPTO huggingface dataset:
Patent FI-128749-B (FI)
Title: Over fire air arrangement and bubbling fluidized bed furnace
Inventor: HUTTUNEN MARKO
IPC: F23L9/02
Filed: 2016-07-01
Granted: 2020-11-30
Abstract: The present invention relates to an over fire air arrangement for a furnace (1), the furnace (1) having opposing first wall (4) and second wall (6) and opposing first side wall (5) and second side wall (7) between the first and second walls (4, 6) for forming a furnace enclosure (2). The over fire air arrangement comprising at least one first over fire air port (20) provided to the first wall (4) for supplying a first over fire air flow (40) into the furnace (1) and at least one first additional over fire air port (50) provided to at least one of the first and second side walls (5, 7) in the vicinity of the first wall (4), the at least one first additional over fire air port (50) being arranged to supplying a first additional over fire air flow (60) into the furnace (1) transversely to the first over fire air flow (40).
Patent FI-128194-B (FI)
Inventor: HUUSKO TONI
IPC: G06T7/246
Filed: 2017-01-30
Granted: 2019-12-13
Abstract: Arrangemang i anslutning till en rörlig lyftanordning omfattar minst en i anslutning till den rörliga lyftanordningen (1) anordnad fotograferingsanordning (4) och processeringsmedel (5). Fotograferingsanordningen (4) är anordnad att lagra åtminstone delvis bilder (7) som visar omgivningen kring lyftanordningen. Processeringsmedlen (5) är anordnade att från minst två vid olika tidpunkter lagrade bilder (7) identifiera minst ett mål (8) som ska identifieras och att definiera riktningen och hastigheten hos lyftanordningens rörelse utgående från det identifierade målets (8) läge på bilderna (7).
Patent HK-1040925-B (HK)
Title: Combinations of cholesteryl ester transfer protein inhibitors and fibric acid derivatives for cardiovascular indications
Inventor: JAMES A SIKORSKI
IPC: A61P9/00
Filed: 2002-04-10
Abstract: The present invention provides combinations of cardiovascular therapeutic compounds for the prophylaxis or treatment of cardiovascular disease including hypercholesterolemia, atherosclerosis, or hyperlipidemia. Combinations disclosed include a fibric acid derivative combined with a cholesteryl ester transfer protein (CETP) inhibitor.
Patent HK-1041625-B (HK)
Title: A natural tea for curing men's impotence and a method for manufacturing the same
Inventor: JONG-HYUN NAM
IPC: A23L1/30
Filed: 2002-04-29
Abstract: Disclosed are a natural invigorating tea and a method for preparing the same. The natural invigorating tea may be in the form of powder, liquid, or granules and is made of parasitic herb, and alder and/or schizandrae fructus, optionally supplemented with torilis fructus and/or polygalae japonica herba. Taking of the tea at least twice a day, morning and evening, invigorates human body.
Patent HU-184926-B (HU)
Title: Process for producing new carbo-prostacyclin derivatives
Inventor: SKUBALLA WERNER
IPC: A61K31/557
Filed: 1979-10-18
Abstract: Compounds of the formula   <IMAGE>   wherein R1 is (a) hydrogen, (b) C1-10 alkyl, (c) C1-10 alkyl substituted by halogen; C1-4 alkoxy; C6-10 aryl; C6-10 aryl substituted by 1-3 halogen atoms, a phenyl group, 1-3 C1-4 alkyl groups or a chloromethyl, fluoromethyl, trifluoromethyl, carboxy, hydroxy or C1-4 alkoxy group; di-C1-4-alkylamino; or tri-C1-4-alkylammonium, (d) C4-10 cycloalkyl, (e) C4-10 cycloalkyl substituted by C1-4 alkyl, (f) C6-10 aryl, (g) C6-10 aryl substituted by 1-3 halogen atoms, a phenyl group 1-3 C1-4 alkyl groups or a chloromethyl, fluoromethyl, trifluoromethyl, carboxy, hydroxy or C1-4 alkoxy group, or (h) an aromatic heterocycle of 5 or 6 ring atoms one of which is O, N or S; A is -CH2-CH2-, trans-CH=CH- or -C 3BOND C-; W is hydroxymethylene, RO-methylene, CH3 or CH3,   <IMAGE>   wherein OH or OR is in the  alpha - or  beta -position and R is an in vivo hydrolyzable and physiologically acceptable ether or acyl group which is conventional for modifying OH groups in prostaglandins; D and E together are a direct bond, or D is C1-10 alkylene, C1-10 alkenylene or C1-10 alkynylene or one of these groups substituted by fluorine, and E is oxygen, -C 3BOND C- or a direct bond; R2 is (a) a C1-10 hydrocarbon aliphatic radical, (b) a C6-10 hydrocarbon aliphatic radical substituted by C6-10 aryl or by C6-10 aryl substituted by 1-3 halogen atoms, a phenyl group, 1-3 C1-4 alkyl groups or a chloromethyl, fluoromethyl, trifluoromethyl, carboxy, hydroxy or C1-4 alkoxy group; (c) C4-10 cycloalkyl, (d) C4-10 cycloalkyl substituted by C1-4 alkyl, (e) C6-10 aryl, (f) C6-10 aryl substituted by 1-3 halogen atoms, a phenyl group, 1-3 C1-4 alkyl groups or a chloromethyl, fluoromethyl, trifluoromethyl, carboxy, hydroxy or C1-4 alkoxy group; or (h) an aromatic heterocycle of 5 or 6 ring atoms one of which is O, N or S; and R3 is OH or OR; and, when R1 is hydrogen, the salts thereof with physiologically compatible bases, are effective as antihypertensive, bronchiodilators, thrombocyte aggregation inhibitors, inter alia.
Patent IT-1260244-B (IT)
Title: Macchina per la lavorazione di pezzi in legno.
Inventor: SACCHI PARIDE
IPC: B27F1/02
Filed: 1992-12-23
Granted: 1996-04-02
Abstract: La macchina in oggetto prevede: dei primi mezzi (2) di trasporto di pezzi (1) in lavorazione atti a portare, in successione e secondo una linea di avanzamento operativa (A), un pezzo, (1) ad impegnare un primo (3) ed un secondo (4) utensile per la lavorazione della zona di testa (T) dello stesso e comprendenti una coppia di primi (5) e secondi (6) mandrini fissi ad asse rispettivamente orizzontale (X) e verticale (Z), disposti lungo la linea di avanzamento operativa (A) dei primi mezzi (2) di trasporto; dei mezzi (8) di posizionamento del pezzo (1), disposti nella zona di fine corsa operativa dei primi mezzi (2) di trasporto, agenti sullo stesso pezzo ed atti a ruotare quest'ultimo in corrispondenza di secondi mezzi (9) di trasporto disposti sfalsati in quota rispetto ai primi (2) ed atti a movimentare il pezzo in direzione (B) sostanzialmente opposta alla precedente linea (A) così da impegnare un terzo utensile (10) nella zona contrapposta al precedente secondo utensile (4), presentati entrambi dal secondo mandrino (6) e disposti coassiali e ad una quota verticale (Qv, Qvl) diversa l'uno dall'altro, in modo da permettere la lavorazione del pezzo (1) lungo il suo profilo longitudinale. (FIG. 1)
Patent IT-1262477-B (IT)
Title: Macchina da maglieria,in specie per calze e simili prodotti di elevatafinezza,con fronture provviste di platine fisse sostituibili
Inventor: CONTI PAOLO
IPC: D04B15/06
Filed: 1993-07-27
Granted: 1996-06-28
Abstract: La macchina comprende per ciascun ago (3) una platina fissa (12) realizzata da materiale laminare nastriforme a spessore sottile, curvato a "C" in una zona intermedia (12A), per circondare l'ago (3) e formare appoggio per le boccole ai due lati dell'ago; le platine a "C" (12) sono ancorate alla struttura della frontura e sono sostituibili indipendentemente l'una dall'altra.(Fig. 5).
Patent IT-1251132-B (IT)
Title: Siringa monouso con dispositivo di sicurezza per siringa monouso, per impedire un uso ripetuto
IPC: A61M5/32
Filed: 1991-07-26
Granted: 1995-05-04
Abstract: Nel corpo (1) della siringa sono previste capsule (8, 9) il cui contenuto, con la distruzione delle capsule, forma una schiuma di poliuretano (10) che si espande e quindi si solidifica. Al termine dell'avanzamento del pistone le capsule (8, 9) vengono distrutte, in quanto il pistone (2) deforma un cappuccio (7) fissato all'ago (6). La schiuma in espansione (10) fa retrocedere l'ago (6) nel corpo (1) della siringa. Si ottiene una semplice ed economica possibilità di escludere un uso ripetuto della siringa.
Patent IT-1251500-B (IT)
Title: Stabilizzazione dopo trattamento di emulsioni fototermografiche
Inventor: BERTOLDI MASSIMO
IPC: G03C8/40
Filed: 1991-09-18
Granted: 1995-05-15
Abstract: L'addizione di 5-mercapto-1H-tetrazoli S-sostituiti ad emulsioni fototermografiche agli alogenuri d'argento migliora la stabilità dopo trattamento dell'emulsione.
Patent IT-1255422-B (IT)
Title: Apparecchiatura per generare impulsi luminosi ad alta potenza
Inventor: TAKEUCHI NOBUAKI
IPC: H01S3/00
Filed: 1992-07-10
Granted: 1995-10-31
Abstract: Apparecchiatura per generare impulsi luminosi ad alta potenza in cui in un sistema ottico viene utilizzata una fibra ottica drogata con un elemento delle terre rare per facilitare il controllo e la regolazione del dispositivo. La potenza luminosa in uscita e la sua durata di impulso possono essere variate semplicemente cambiando le caratteristiche e la lunghezza della fibra ottica. Nell'apparecchiatura per la produzione di impulsi luminosi ad alta potenza, un'uscita di una sorgente luminosa (2) di pompaggio ottico viene portata in ingresso ad un accoppiatore ottico (3) che costituisce un circuito ottico in cooperazione con la fibra ottica (1) drogata con l'elemento delle terre rare, un disaccoppiatore ottico (4), un interruttore ottico (5A), un isolatore (7) ed una porta di ingresso dell'accoppiatore ottico (3). Chiudendo l'interruttore ottico (5A), si può generare attraverso il circuito ottico un impulso luminoso ad alta potenza che può essere estratto da una porta di uscita del disaccoppiatore ottico (4).
Patent IT-1256150-B (IT)
Title: STEAM GENERATOR OF THE TYPE WITH A LOW NOx LEVEL COMPRISING MULTIPLE WATER-PIPE CHAMBERS AND USING GAS- RADIATING BURNERS
IPC: F24B/
Filed: 1992-09-24
Granted: 1995-11-29
Abstract: Steam generator of the water-pipe type, using a plurality of gas radiating burners made of ceramic fibre or the like and comprising a staggered arrangement of said radiating burners and a multiple combustion chamber structure formed by means of walls consisting of membraned and shaped, subvertical, alternate wide- curvature pipes having curvature radii such as to form around each burner a substantially quadrangular-shaped irradiation chamber, the set of said cells being adjacent to each other and arranged in staggered fashion, while the pipes forming said membraned walls are connected to said horizontal cylindrical bodies so as to form the evaporation walls of the radiating section with uniform irradiation on both sides of the said walls. <IMAGE>
Patent IT-1273358-B (IT)
Title: Pistola semiautomatica perfezionata
Inventor: RIVA EDOARDO
IPC: F41C/
Filed: 1994-03-01
Granted: 1997-07-08
Abstract: Una pistola semiautomatica è dotata di un carrello mobile (4) costituito dall'otturatore che scorre internamente al corpo (1) della pistola e la cui estremità posteriore (5) fuoriesce attraverso un'apertura ricavata posteriormente in detto corpo (1), il quale presenta inoltre la feritoia di espulsione (2) in corrispondenza della camera dell'otturatore. Il carrello (4) agisce sulla molla di recupero (7) tramite un elemento (6) conformato ad L che scorre lateralmente alla canna (9).
Patent IT-1274673-B (IT)
Inventor: NORCINI GABRIELE
IPC: A61K38/00
Filed: 1994-04-14
Granted: 1997-07-24
Abstract: PCT No. PCT/EP95/01322 Sec. 371 Date Sep. 13, 1996 Sec. 102(e) Date Sep. 13, 1996 PCT Filed Apr. 11, 1995 PCT Pub. No. WO95/28417 PCT Pub. Date Oct. 26, 1995Compounds of formula (II)    <IMAGE>  (II)  wherein R is a biphenyl group optionally substituted by one or more substituents, the same or different, selected among halogen atoms, hydroxy groups, alkoxy, alkyl or thioalkyl groups having from 1 to 6 carbon atoms in the alkyl moiety, carboxylic groups, nitro groups, amino, mono- or di-alkylamino groups having from 1 to 6 carbon atoms in the alkyl moiety; R1 is a hydrogen atom or a straight or branched C1-C4 allyl; R2 is a straight or branched C1-C6 alkyl or an arylalkyl having from 1 to 6 carbon atoms in the alkyl moiety wherein the aryl is a phenyl, a naphthyl or a 5 or 6 membered aromatic heterocycle with one or two heteroatoms selected among nitrogen, oxygen and sulphur, optionally substituted as above indicated for the R substituent; R3 is a straight or branched C1-C6 alkyl, optionally containing one or more fluorine atoms, or an arylalkyl having from 1 to 6 carbon atoms in the alkyl moiety; the carbon atoms marked with an asterisk are asymmetric carbon atoms; and their pharmaceutically acceptable salts, are described. The compounds of formula (II) are useful in the treatment of cardiovascular diseases.
Patent IT-1274424-B (IT)
Title: Automatic guiding and sliding device for small parts and the corresponding positioning head
Inventor: PISANI ROBERTO
IPC: A43D/
Filed: 1995-05-03
Granted: 1997-07-17
Abstract: A device for automatic guiding and sliding of small parts, especially shoemaking tacks 36, is provided with a pair of guides 10, 12, associated with a lower support 18, to which they are linked by brackets 46 and pins 38 inserted into blocks 24, 26; the guides 10, 12 can come together or move apart by means connected to said blocks and brackets, and are associated with an additional pair of guides 14, 16, at least one of which can move transversely with respect to the support 18 to form a constant support wall for the side of the tacks 36. In the head 84 for grabbing the tacks 36, which can be combined with said device, there is arranged a plate 100 integrated with the front end of a screw 102, inserted transversely in the lower part 88 of the body, lined up with the seat 98 in which the tacks 36 are positioned. A check nut 104 is screwed onto the portion 102' of the screw 102 projecting from the head 84.
Patent IT-1264327-B (IT)
Title: Device for automatic unpacking of products in envelopes, also applicable to automatic distributors
IPC: B65B/
Filed: 1992-01-31
Granted: 1996-09-23
Abstract: The invention proposes a device able to unpack, in general, all products contained in envelopes and especially food products. The device is comprised of a plate and a surface contiguous or slightly spaced away from it, on which the envelope is placed and secured at the four corners. The space between the plate and the surface serves to allow for the passage of a blade endowed with circular or linear motion, able to cut the flap of the envelope secured to the surface. After the flap of the envelope has been cut, the plate on which it is secured rotates to allow the contents to emerge; after this, the mechanical elements securing the corners of the envelope move away, allowing it and the cut flap to drop into an appropriate container. <IMAGE>
Patent IT-1254307-B (IT)
Title: Dispositivo di aerazione del vano interno di un veicolo in particolareimpianto di riscaldamento e climatizzazione per un autoveicolo.
IPC: B01D53/81
Filed: 1992-02-10
Granted: 1995-09-14
Abstract: L'invenzione concerne un dispositivo di aerazione per l'abitacolo di un veicolo, in particolare un impianto di riscaldamento e rispettivamente di climatizzazione per un autoveicolo. Il dispositivo di aerazione ha una soffiante per il cambio dell'aria nell'abitacolo e un filtro per l'adsorbimento di sostanze odorose e rispettivamente tossiche contenute nella corrente dell'aria. Il filtro è realizzato in modo tale che per uno spettro più ampio possibile di sostanze odorose e rispettivamente tossiche si ha un effetto filtrante che si basa sul rapido adsorbimento delle sostanze odorose e rispettivamente tossiche e sul suo graduale deassorbimento fortemente ritardato nel tempo. Una elevata concentrazione di breve durata delle sostanze odorose e rispettivamente tossiche viene quindi trasformata dal filtro in una emissione estremamente bassa, però lunga per questo scopo, che, in presenza di una diluizione sufficientemente grande, rimane al di sotto di una soglia prestabilita di odori e rispettivamente di disturbo.
Patent IT-1262880-B (IT)
Title: Self-centring frame
Inventor: FALOMO EZIO
IPC: A47C/
Filed: 1993-12-23
Granted: 1996-07-04
Abstract: Self-centring frame of the type used to constitute or co- operate with a bedspring 10 for the supporting and the positioning of a mattress 17, said bedspring 10 being either of the slat type or the metal screen type, said frame 11 being comprised of two lengthwise members joined at the ends by two cross members 14, at least the upper surface 15 of the lengthwise members 13 being at least partially fashioned as an inclined plane 16 oriented toward the inside of said frame 11. <IMAGE>
Patent MX-167220-B (MX)
Title: Mejoras en papel con apresto neutro para uso en la produccion de tableros de yeso para muros
Inventor: JOHNSTONE NORMAN EDWARD
IPC: D21H17/67
Filed: 1983-11-03
Abstract: La presente invención se refiere a mejoras en papel adaptado en particular para uso como hojas de cubierta en la producción de tableros de yeso para muros, caracteizadas en que el papel comprende: una proporción mayor de fibras de celulosa; un anhídrido cíclico de ácido dicarboxílico aplicado como agente aprestador interno y que tiene la fórmula estructural en donde R se selecciona del grupo consistente en radicales dimetileno y trimetileno y en donde R' es un grupo hidrófobo que contenga 5 o más átomos de carbono, seleccionado del grupo consistente en grupos alquilo, alquenilo, aralquilo y aralquenilo; un agente catiónico; un agente amortiguador que es una sal de una base fuerte y un ácido débil, adaptado para mantener el papel, durante la formación, a un pH de, cuando menos, 7.0.
Patent RO-87917-B (RO)
Inventor: KORTEN GERO
IPC: A61M1/28
Filed: 1983-06-28
Abstract: Prezenta inventie se refera la un dispozitiv de dializa cu sistem de regenerare utilizat pentru dializa peritonetala ambutisanta continuu, pentru usurarea pacientului, caruia nu ie mai poate face hemiliza din diferite motive: batrînete, boli. Sistemul de regenerare prevazut la purificarea dializatului consta dintr-unul sau mai multe elemente de regenerare, care sînt alcatuite dintr-o carcasa solida sau o folie flexibila si sînt umplute cu adsorbanti. Sistemul de regenerare este dispus, fie în interiorul, fie în exteriorul sistemului de furtunuri sau la admisia, respectiv evacuarea recipientului pentru lichidul de dializa si este strîns legat de acesta. Sistemul de regenerare poate fi dispus cu deplasare libera în recipientul pentru lichidul de dializa, mantaua pentru adsorbanti fiind alcatuita dintr-un element de filtrare cu permeabilitate pentru lichide.
Patent TW-207997-B (TW)
IPC: C07D405/04
Filed: 1991-11-21
Granted: 1993-06-21
Abstract: PCT No. PCT/EP91/02228 Sec. 371 Date Jul. 24, 1992 Sec. 102(e) Date Jul. 24, 1992 PCT Filed Nov. 26, 1991 PCT Pub. No. WO89/08646 PCT Pub. Date Sep. 21, 1989.Compounds having formula (I)    <IMAGE>  (I)  wherein Z is -O- or -CH2-; n is 1-6; R is hydrogen, C1-C6 alkyl, phenyl or optionally substituted phenyl-C1-C3 alkyl; R2 is C1-C8-alkyl, aryl-C1-C3 alkyl, C5-C8 cycloalkyl or C5-C8 cycloalkyl-C1-C3 alkyl; each of R3 and R4 independently is hydrogen or C1-C4 alkyl, or taken together with the carbon atom to which they are linked form a C3-C6 cycloalkyl ring; Q is -OR' or -NR'R'' in which R' and R'' are as herein defined, or Q is C1-C8 alkyl, phenyl, phenyl-C1-C3-alkyl, C5-C8 cycloalkyl or C5-C8 cycloalkyl-C1-C3 alkyl, in which both the phenyl and cycloalkyl rings or moieties are optionally substituted as herein defined; and the pharmaceutically acceptable salts thereof; are useful in particular as antidislipidaemic and antiatherosclerotic agents.
Patent TW-259804-B (TW)
IPC: C08L23/12
Filed: 1992-12-15
Granted: 1995-10-11
Abstract: A polyolefin moulding composition essentially comprising from 20 to 99 % by weight, based on the moulding composition, of an isotactic polyolefin containing no atactic polymer chains and from 1 to 80 % by weight, based on the moulding composition, of a rubber having a glass transition temperature of below -20 DEG  C is distinguished by high impact strength and hardness even at low temperatures.
Patent TW-301653-B (TW)
IPC: A61P35/00
Filed: 1993-01-30
Granted: 1997-04-01
Abstract: A salt of glucopyranose derivative of the formula (I) <CHEM>  wherein     R<2> is <CHEM>     R<3> is <CHEM>     Y<+> is sodium ion or tris(hydroxymethyl)methylammonium ion. Further, a glucopyranose derivative of the formula (II) <CHEM> wherein all the symbols are the same meaning as hereinbefore defined, is an important intermediate for the preparationof compound of the formula (I). The compoud of the formula (I) is prossess enhancing activity of cellular immunity, and therefore be useful for enhancing agent of immunity, prossess inducing activith of TNF, inducing activity of IL-1 and inducing activity of IFN, and therefore be useful for anti-tumor agent. Further, the compound of the formula (II) is intermediate for the preparation of compound of the formula (I), and it can be prepared to advantage on industrially.
Patent TW-225018-B (TW)
Title: Compression and decompression method and apparatus for image data
Inventor: MIYANE TOSHIKI
IPC: H04N7/30
Filed: 1993-09-29
Granted: 1994-06-11
Abstract: A decompression method for compressed image data which is produced by continually executing orthogonal transformation, quantization and entropy coding. The method includes the following procedures: 1. allocating compressed image data including code data for multiple pixel blocks in the image, allocating the first coefficient code for the first pixel block, allocating the second coefficient code for the arbitrarily second pixel block, in which the first pixel block is located on the front end of multiple pixel blocks; 2. executing entropy coding to generate quantization transformation coefficient for multiple pixel blocks according to the code data, executing entropy decoding to generate the first and second coefficient according to the first and second coefficient code; 3. multiplying the predetermined basic quantization level of basic quantization table with the first and second coefficient to generate the first and second quantization table; 4. reverse-quantizing the quantization transformation coefficient of the first and second quantization table to get reverse quantization transformation coefficient; 5. executing the reverse orthogonal transformation to get decompressed image data based on the reverse quantization transformation coefficient.
Patent TW-335349-B (TW)
Title: Ultraviolet shielding composite fine particles having transparency in a visible light region, method for producing the same, and cosmetic composition comprizing the same
Inventor: OOSHIMA KENTAROU
IPC: A61K8/19
Filed: 1994-09-30
Granted: 1998-07-01
Abstract: A sort of ultraviolet shielding composite fine particles having transparency in a visible light region, including: (a) matrix particles comprizing an aggregate of primary particles having gap carrying energy of from 3 to 9eV and an average particle diameter of from 0.001 to 0.3 um, said aggregate being formed while retaining the shapes of the primary particles; and (b) daughter particles having an average particle diameter of from 0.001 to 0.1 um, said daughter particles being dispersed in and supported by said matrix particles, wherein said daughter particles having a smaller band gap energy than that of particles consistuting said matrix particles, and possess capability of absorbing ultraviolet light, having a gap energy difference between the daughter particle and the particles forming the matrix particles of not less than 0.2eV, where density of the daughter particles in the overall solid volume varying from 0.1 to 50% by volume.
Patent TW-275144-B (TW)
Title: An improved isolation technology for integrated circuits
Inventor: SU WENN-DOW
IPC: H01L27/105
Filed: 1995-04-21
Granted: 1996-05-01
Abstract: A manufacturing method for field oxides on integrated circuits, comprising: depositing a pad oxide layer on a silicon semiconductor substrate; forming a polysilicon layer on the pad oxide layer; placing the polysilicon layer in a high temperature environment filled up with NH3, and performing nitridation on the polysilicon layer to form an extremely thin layer of silicon nitride over the surface of the polysilicon layer; forming a silicon nitride layer over the surface of the extremely thin silicon nitride layer; utilizing plasma etching technique to anisotropically pattern the composite structure formed of the pad oxide layer, the polysilicon layer, the extremely thin silicon nitride layer and the silicon nitride layer; performing oxidation process, placing the wafer in a high temperature environment filled up with oxygen and forming field oxide with the silicon nitride as an oxidation mask.