baber/WOPTO huggingface dataset:
Patent PL-158608-B1 (PL)
Title: Method of and apparatus for treating waste waters containing organic substances, in particular for efficient removal of phosphorus and nitrogen
IPC: C02F1/52
Filed: 1987-05-19
Abstract: The invention relates to a process and an apparatus for the purification of waste waters containing organic substances, in particular for the effective removal of nitrogen and phosphorus, which are characterised by three sections (sequence: anaerobic - aerobic - semianaerobic), a high load and short residence time. In the apparatus according to the invention, by regulating the residence time of the sludge in the associated sedimentation vessel in comparison to systems with total oxidation, a significantly more effective removal of nitrogen and phosphorus from the waste waters (effluents) containing the organic substances can be achieved, without precipitation chemicals and/or external carbon sources for denitrification being required. The system, as required, can be extended by an apparatus for sludge treatment, with the aid of which the purification of the sludge water and return into the system can be achieved.
Patent PL-156837-B1 (PL)
Title: Method of power control of an electric receiver
IPC: G05F1/66
Filed: 1987-11-20
Abstract: Method of controlling the power of an electrical load device, in particular an arc furnace, based on a transformer-based power supply circuit and an electromechanical system, cooperating with that circuit, for the regulation of the position of electrodes in relation to the charge, such that constant measurement is made of the value of the voltage and the value of the current intensity of the electrical arc, and the regulative values being the result of those measurements are used both to control the operation of the system for regulating the position of the electrodes and for follow-up regulation of the impedance of the regulating transformers, whose primary windings are connected in series to the primary windings of the three-phase main transformer, characterized in that in order to obtain selective power control in individual phases of the power supply system, voltage signals, proportional to the current value or to the product of voltage and current in the load device, are compared with a strictly controlled reference voltage which is obtained from a separate, independent power source, while voltage signals proportional to the current in the load device are sent simultaneously to a system of blocking devices in the regulation circuit of the regulating transformers, by means of which the control process is interrupted in case of a drop in the current flowing in the load device, while in order to achieve power symmetry in the three-phase circuit or deliberate deformation of this power symmetry, the voltage and current signals from the power supply circuit of the load device are additionally compared in the control circuit of the regulating transformers with applied signals of voltage and current obtained from a separate power source, and the differential measurements thus obtained are used to form voltage signals, which are transmitted to the regulator.
Patent PL-156572-B1 (PL)
IPC: G05D11/16
Filed: 1987-12-01
Abstract: U k ła d u rząd zeń d o ste ro w a n ia p ro cesem
te c h n o lo g ic z n y m o tw o ró w w y d o b y w czy ch ,
sk ła d a ją c y się z b u d y n k u stero w n i, z b io rn ik ó w
m ag azy n o w y ch i k o le k to ró w o tw ó r - ste ro w ­
n ia, znamienny tym , że b u d y n e k stero w n i (1) i
z b io rn ik i (2) są u staw io n e w zględem siebie
p ro s to p a d le a k o le k to ry (6) u ło ż o n e są o b o k
b u d y n k u (1), p rzy czym o b w o d n ic a w o d n a (4)
z n a jd u je się tak że p o z a b u d y n k ie m (1) i p o łą ­
czo n a jest z k o le k to ra m i p rz e d m a g istra ln y m i
(3), p rzy k tó ry ch u k ła d z o sta ł zlo k alizo w an y .
Patent PL-157888-B1 (PL)
Title: Method of and system for measuring regulatory parameters of piston engine timing gears
IPC: G01M/
Filed: 1987-12-30
Abstract: Method and system for measurement of adjustment parameters of timing gear systems in piston combustion engines, comprising full-resistant measurement bridge, "X-Y" registration unit, stabilised current and voltage sources and angle position transformer, characterised in that between the valve spring coils (2) there is a measurement clip (4), on the surface of which there is the resistance element (7) of the strains transformer (6), constituting a one branch of powered from the current source (17) measurement bridge (8), (9), (10), data signal from which after strengthening in the amplifier (11) controls the "Y" input of the registration unit (12), whereas the "X" input is activated by a signal received from the angle position transformer, assembled from the elements (13), (14), (15), supplied by the stabilised voltage source (18) of the engine shaft (16).<IMAGE>
Patent PL-156588-B1 (PL)
IPC: G09G5/36
Filed: 1988-04-01
Abstract: Układ formowania parametrów geome-
<>trycznych obrazu telewizyjnego dla cyfrowego
przetwarzania obrazów, wyposażony w kamerę
telewizyjną, znamienny tym, że generator
impulsów odchylenia poziomego (9) kamery
telewizyjnej jest połączony z dzielnikiem częstotliwości
(5), który za pośrednictwem detektora
fazy (4) układu opóźniającego impulsy (3)
i układu formującego (2), jest połączony ze
źródłem napięcia odniesienia (1), nadto detektor
fazy (4) jest połączony za pośrednictwem
filtra dolnoprzepustowego (6) i wzmacniacza
(7) z wejściem węzła sumującego (8), którego
drugie wejście jest połączone za pośrednictwem
układu korekcyjnego (10) ze źródłem
napięcia odniesienia (1), zaś wyjście węzła
sumującego (8) jest połączone z generatorem
odchylenia poziomego (9) kamery telewizyjnej.
Patent PL-157039-B1 (PL)
Title: Filling compound for storage batteries
IPC: C08L95/00
Filed: 1988-09-12
Abstract: Accumulator sealant, containing petroleum derived asphalt, plasticizer and organic filler; is characterised in that it contains 30-60 parts by weight of petroleum derived asphalt, 21-37 parts by weight of hydroraffinate, being the product of conservative processing of crude oil selectively furfural-refined, then de-waxed and hydrogen refined, 0.1-1.0 part by weight of colloidal silica with bulk density 160-230 kg/m<3> and with oil absorption number 150-245, and 0-06 parts by weight of α naphthylamine.
Patent PL-157401-B1 (PL)
Title: Multi-function plant fertilization programmer
IPC: A01C23/00
Filed: 1988-09-22
Abstract: 1. Multi-functional plant fertilization programmer, containing a microprocessor circuit with an 8035 central unit in standard configuration, characterized in that to the microprocessor circuit (1) are connected two input and output ports (2, 3) of which one port (2), which serves the circuits for communication with the user, is coupled to informational segments (4-4e) which have digital displays and are activated by means of a changer (5) and driver (6), and that port is also coupled via a matrix (7) to informational buttons (8-8e) and functional buttons (9-9e) used for the implementation of the entire fertilization programme, while the second port (3) is coupled to the controller of the container valves (10), to a circuit (11) of demultiplexers and control units for the valves of particular fertilization functional sections, to the controller (12) of an injection pump, to a blocking system (13) for salt and acidity regulators, to a system of switches (14) for control of the dosing valve, to converters (15, 16) of the calibration signal translators (15a, 16a) of the salt and acidity regulators, and to the extractor (17) of the alarm control and blocking signal.<IMAGE>
Patent PL-156093-B1 (PL)
IPC: C01B21/16
Filed: 1988-12-12
Abstract: Sposób aktywowania wodnych roztworów hydrazyny stosowanych do redukcji tlenu
rozpuszczonego w wodzie, zwłaszcza zasilającej układy energetyczne i ciepłownicze polegający
na dodaniu do hydrazyny substancji aktywujących, znamienny tym, że jako substancję aktywującą
stosuje się hydrochinon, korzystnie z dodatkiem soli dwuwartościowego kobaltu lub niklu
korzystnie octany lub mrówczany.
Patent PL-163718-B1 (PL)
Title: Method of and apparatus for removing hazardous solid substances
Inventor: BENOIT MICHEL R
IPC: F23G5/20
Filed: 1989-11-23
Abstract: A method is described for environmentally sound usage of combustible hazardous waste in an operating rotary kiln. The method is particularly adapted for disposal of solid hazardous wastes, optionally in the form of a blended waste homogenate, packaged in sealable containers. The containers are used as fuel modules and charged into a rotary kiln cylinder where kiln gas temperatures range from about 950 DEG  to about 1200 DEG  C. to achieve high destruction and removal efficiencies.
Patent PL-171014-B1 (PL)
Inventor: SCHLEMM FRIEDRICH
IPC: F16L53/00
Filed: 1993-03-29
Abstract: 1 Sposób usuwania rteci z rur gazociagów i z czesci urzadzen sluzacych do przeróbki i transportu gazu ziemnego, znamienny tym, ze przewód gazociagu dzieli sie na odcinki rurowe za pomoca ciec wykonywa- nych na zimno, a po kazdym cieciu odcieta rure podnosi sie do polozenia skosnego lub pionowego i materialy stale oraz ciekle zawarte w rurze usuwa sie do naczynia ustawionego pod nizszym koncem rury, po czym oba konce rury zamyka sie zatyczkami i transportuje sie mre do stanowiska odparowania, na którym przez kró- ciec rurowy w zatyczce, napelnia sie rure gazem obojet- nym, a napelniona obojetnym gazem rure ogrzewa sie i odparowuje sie zawarta w niej rtec, a nastepnie ogrzany 1 zawierajacy pary rteci gaz obojetny, doprowadza sie do skraplacza, w którym obojetny gaz zawierajacy pary rteci ochladza sie do wytracenia rteci z gazu obojetnego 9. Urzadzenie do usuwania rteci z rur gazociagów i z czesci urzadzen sluzacych do transportu gazu ziemne- go, znamienne tym, ze ma zbiornik gazu obojetnego, urzadzenie grzewcze, urzadzenie wytwarzajace próz- nie, skraplacz oraz pompe, które polaczone sa ze soba przewodami rurowymi, przy czym w przewody te jest wlaczona czyszczona rura lub czesc rurociagu FIG.1 PL
Patent PL-171753-B1 (PL)
Title: Method of obtaining sodium phosphate from the extraction phosphoric acid
Inventor: TREFLER BRONISLAW
IPC: C01B25/222
Filed: 1993-04-27
Abstract: The method of producing extractive phosphoric acid, accompanied by simultaneous utilisation of post-neutralisation sludge, generated in the process of producing sodium phosphates by neutralising extractive phosphoric acid with sodium carbonate and/or sodium hydroxide, followed by filtering the precipitated impurities. Characterized in that: The filtered post-neutralisation precipitate is re-pulped in water and dissolved in dilute sulphuric acid. The resultant suspension is introduced into the process of extraction of phosphoric acid from phosphoric ores.
Patent PL-174732-B1 (PL)
Title: Method of making a bipolar membrane and method of obtaining alkali metal hydroxide
Inventor: POSAR FRANCESCO
IPC: C25B13/04
Filed: 1994-04-06
Abstract: Process for the manufacture of a bipolar membrane, according to which a cationic membrane is treated with a compound of a polyvalent metal and with an aqueous alkali metal hydroxide solution comprising lithium hydroxide and is then joined side by side to an anionic membrane. The bipolar membrane finds an application in the manufacture of aqueous sodium hydroxide solutions by electrodialysis. No figure.
Patent PL-172646-B1 (PL)
Inventor: Staszczak Jerzy
IPC: G01V1/24
Filed: 1994-06-09
Abstract: Układ synchronizacji aparatury rejestrującej z
eiektrohydrodynamicznym generatorem impulsów
sejsmicznych składającym się z generatora udarów
prądowych wysokiego napięcia połączonego kablem
współosiowym prądowym wysokiego napięcia z
przetwornikiem eiektrohydrodynamicznym, który
zawiera przetwornik prądowy z obwodem wyjściowym
ekranowanym i z jednym przewodem pozostającym
na potencjale masy generatora udarów'
prądowych włączonyw obwódkablawspółosiowego
prądowego wysokiego napięcia oraz diodę i tranzystor,
znamiennytym, ze przetwornikprądowy stanowi
impulsowy przekładnik prądowy (5) połączony
poprzez transformator impulsowy (6) i rezystor (7) z
bazą tranzystora (9), którego złącze emiter - baza
bocznikowane jest diodą (8) a kolektor i emiter są
połączone w znany sposób z wejściem obwodu uruchamiania
podstawy czasu cyfrowej aparatury rejestrującej
(10).
Patent PL-175622-B1 (PL)
Inventor: BEZBORODOW WLADIMIR
IPC: C09K19/30
Filed: 1994-08-18
Abstract: 1. Nowe ciekłokrystaliczne chlorozwiązki o wzorze ogólnym 1, w którym Ri i R2 są jednakowe lub różne i oznaczają grupę
Y-(CH2)n-(O]m-(CH2)k-(O)1-(CH2)p-, gdzie Y oznacza atom H, F, Cl,
n, p i k przyjmują wartości od 0 do 7, m oraz l oznaczają 0 lub 1;
Zi i Z2 są jednakowe lub różne i oznaczają wiązanie pojedyncze
albo grupę CH=CH, Ai oznacza jeden z fragmentów oznaczony
wzorami 2, 4, 5, 6 i A2 oznacza wiązanie pojedyncze albo jeden z
fragmentów oznaczony wzorami 2 65, gdzie X,, Χ2, Χ3 i osaczają
niezależnie atom wodoru lub fluoru, lub chloru, a B, Bii B2
oznaczają niezależnie wiązanie pojedyncze lub grupę mostkową
takąjakCH2CH2, OCH2 CH2O; s oraz toznaczająniezależnie liczbę
0 lub 1 i spełniają warunek s + t # 0.
2. Sposób otrzymywania ciekłokrystalicznych chlorozwiązków
o wzorze ogólnym 1, w którym Ri i R2 sąjednakowe lub różne
1 oznaczają grupęY-(CH2)n-(O)m-(CH2)k-(O)i-(CH2)p-, gdzieYoznacza
atom H, F, Cl, n, p i k przyjmująwartości od 0 do 7, m oraz l
oznaczają 0 lub 1: Zi i Z2 są jednakowe lub różne i oznaczają
wiązanie pojedyncze albo grupę CH=CH; Ai oznacza jeden z
fragmentów oznaczony wzorami 2, 4, 5, 6 i A2 oznacza wiązanie
pojedyncze albo jeden z fragmentów oznaczony wzorami 2-6,
gdzieXi, Χ2, Χ3 iX4 oznaczają niezależnie atom wodoru lub fluoru,
lub chloru, a B, Bii B2 oznaczają niezależnie wiązanie pojedyncze
lub grupę mostkową taką jak CH2CH2, OCH2, CH2O; s oraz t
oznaczają niezależnie liczbę 0 lub i i spełniają warunek s + t #0,
znamienny tym, że polega on na ogrzewaniu związku o wzorze
7, w którym Ri i R2 są jednakowe lub różne i oznaczają grupę
terminalną wybraną ze zbioru: Y-(CH2)n-(O)m-(CH2)k-(O)i-(CH2)p-,
gdzie Y oznacza atom H, F, Cl, n, p i k przyjmują wartości od 0 do
7, m oraz l oznaczają 0 lub 1; Zi i Z2 są jednakowe lub różne i
oznaczają wiązanie pojedyncze albo grupę CH=CH; Ai oznacza
jeden z fragmentów oznaczony wzorami 2, 4, 5, 6 i A2 oznacza
wiązanie pojedyncze albojeden z fragmentów oznaczony wzorami
2 - 10, gdzie Xi, X2, X3i Χ4 oznaczają niezależnie...
Patent PL-175893-B1 (PL)
Inventor: SMENDA JERZY
IPC: B01D53/74
Filed: 1994-09-23
Abstract: 1. Urządzenie do adsorpcji zanieczyszczeń z
gazów, zwłaszcza węglowodorów, mające postać zbiornika
z dnem1 pokrywą, wewnątrz którego usytuowany
jest ruszt przepuszczalny dla gazów, na którym znajduje
się złoze adsorbenta, znamienne tym, ze złoze
adsorbenta (5) umieszczone jest w elastycznej obudowie
(6), nieprzepuszczalnej dla gazów, i wraz z nią
usytuowane w zbiorniku (1) adsorbera, przy czym
elastyczna obudowa jest usytuowana równolegle do
kierunku przepływu gazu, zaś między elastyczną obu0S)
dową (6) a ścianką zbiornika (1) adsorbera znajduje
się przestrzeń tworzącaprzegrodę kompensacyjną, zamkniętą
dla przepływu gazów.
Patent PL-179904-B1 (PL)
Title: Polysubstituted derivatives of 3-acylamine 5-phenyl-1,4-benzoazepin-2-one, method of obtaining them and pharmaceutical preparations containing such derivatives
IPC: C12N9/99
Filed: 1995-02-14
Abstract: Benzodiazepine derivs. of formula (I) and their stereoisomers and salts are new. Ra = H, 1-4C alkyl, CH2-CHOH-(CH2)m-Z or (CH2)nCORo; m = 0 or 1; Z = 1-4C alkyl, 3-8C cycloalkyl, or aryl or heterocyclyl opt. substd. by 1-4C alkyl, 1-4C alkoxy or halo; n = 1-3; Ro = OR2 or NR2R3; R2, R3 = H or 1-4C alkyl, or NR2R3 is a satd. or unsatd. heterocyclic ring; Rb = Rba or NHRbb; Rba = quinolyl, isoquinolyl, benzimidazolyl, indolyl, or indolyl N-substd. by CO-(1-4C alkyl) or (CH2)nCORo; Rbb = phenyl monosubstd. by halo, 1-3C alkyl or 1-3C alkoxy; X1-X3 = 1-3C alkyl, 1-3C alkoxy, halo or CF3; X4 = H, or is identical to X1, X2 or X3. Also claimed are intermediates of formula (II) (as (I) but with NHCORb replaced by NH2) and their stereoisomers and salts.
Patent PL-176840-B1 (PL)
Title: Apparatus for tensioning chains of mining scraper conveyors
Inventor: HALUCH EUGENIUSZ
IPC: B65G23/44
Filed: 1995-08-11
Abstract: 1. The device for tightening the drawing chain in mining push-plate conveyors contains a gear driven with a hydraulic engine, fed with the operating medium by a reducing-filtering station, and a multi-way separator. Unique characteristics: The gear (1) is equipped with a sliding wheel (6), mounted - by means of self-lubricating bushes (9) - on the fixed axle (8) and equipped with the guiding groove (6a), which accommodates the blade (10) of the eccentric cam (11) of the controlling lever (12). The wheel is in contact with the limit switch (15) of the conveyor drive, secured inside the housing (1a), and with the driving wheel (2). The open housing (1a) of the gear (1) is symmetrical with respect to the symmetry plane (P), parallel to the disk wheel (7), and it is equipped with openings at both sides.
Patent PL-184471-B1 (PL)
Title: Formed cream substitute and method of obtaining same
Inventor: BILLER FLORIAN
IPC: A23P10/00
Filed: 1996-11-20
Abstract: A shaped cream substitute for adding to hot dishes comprises the following ingredients : (a) 20 - 60 % spray-dried standard cream powder which contains at least 42 % fat and maximum 5 % water ; (b) 10 - 50 % spray-dried standard fat powder which contains at least 50 % fat ; and (c) 15 - 50 % pure fat matrix. Also claimed are the processes for making the substitute in portion or granulate form.
Patent PL-180080-B1 (PL)
IPC: F23J11/00
Filed: 1996-12-17
Abstract: 1. Kanał spalin odprowadzający spaliny
z przemysłowego kotła i wyposażony w
wewnętrznąwarstwę izolacyjną, znamienny
tym, że wewnętrzna powierzchnia kanałU
jest pokryta hydroizolacyjną warstwą elastomeru
(4), która to warstwa elastomeru (4)jest
pokryta warstwą pianki z modyfikowanego
poliuretanu (5).
Patent PL-176668-B1 (PL)
Title: Transportable building scaffolding
Inventor: KRAUSE GUENTHER
IPC: E04G1/24
Filed: 1995-05-24
Abstract: PCT No. PCT/EP95/01971 Sec. 371 Date Dec. 30, 1996 Sec. 102(e) Date Dec. 30, 1996 PCT Filed May 24, 1995 PCT Pub. No. WO96/01351 PCT Pub. Date Jan. 18, 1996Mobile scaffoldings must fulfill many different purposes, which, among others, are characterized by variously wide platforms being needed at different distances from structures. An inventive arrangement is adaptable to a degree that it meets many demands. Movable crossbeams changeable on cross-traverses are provided for this purpose in the area of the undercarriage, on which crossbeams are fastened to the posts for the frames connected with the platforms.
Patent PL-178053-B1 (PL)
Title: Self-cleaning surfaces of objects and method of obtaining such surfaces
Inventor: BARTHLOTT WILHELM
IPC: F24J2/50
Filed: 1995-07-25
Abstract: The self-cleaning surfaces of objects have an artificial surface structure of elevations and depressions wherein the distances between said elevations are in the range of from 5 to 200 mum, and the heights of said elevations are in the range of from 5 to 100 mum, and at least said elevations consist of hydrophobic polymers or permanently hydrophobized materials, and said elevations cannot be detached by water or by water containing detergents.
Patent PL-181693-B1 (PL)
Inventor: FENICAL WILLIAM H
IPC: A61P35/00
Filed: 1995-11-01
Abstract: 1. Srodek farmaceutyczny o selektywnym dzialaniu cytotoksycznym, znamienny tym, ze zawiera eleuterobine lub jej analogi o wzorze w którym R 1 oznacza wodór lub grupe acylowa o 1 -6 atomach wegla i R2 oznacza wodór lub grupe acylowa o 1-6 atomach wegla. PL PL PL PL
Patent PL-182820-B1 (PL)
Title: Leak-tight union piece
Inventor: PRICHARD JAMES B
IPC: A61M25/18
Filed: 1996-12-11
Abstract: A fluidic connector with a leak proof connection site that includes a first larger diameter portion, a second smaller diameter portion and a deformable buckling region that forms a part of both the first and second diameter portions where the two portions join. The first larger diameter portion forms a separate inner surface for receiving a plug to securely seal off the connection site from fluid communication therethrough while the second smaller diameter portion is adapted to receive and securely seal different sizes of male adapters used for attaching a lumen. The deformable buckling region forms a structural buffer between the first and second diameter portions in order to maintain the diameter of the first larger diameter portion when the second smaller diameter portion is stretched out by prolonged insertion of a nonconforming male adaptor. In addition, an adapter is provided which permits flexibility in use and provides a redundant fluid seal, without exhibiting creep.
Patent PL-185174-B1 (PL)
Title: Inhibition of bacteria growth in absorptive articles by addition of other bacteria
Inventor: RUNEMAN BO
IPC: A61F13/472
Filed: 1996-07-02
Abstract: The invention relates to absorbent articles, such as diapers and like articles and is concerned with methods for preventing undesirable odors and/or preventing the growth of undesirable microorganisms when the articles are in use, and also provides an absorbent article which can be worn for long periods of time without generating undesirable odors, incurring the risk of infection or having a negative effect on skin. Another object is to amplify the presence in the wearer's urogenital zone of microbiological flora that will assist in preventing the occurrence of urinal tract infections. These objects have been achieved by adding to the absorbent articles microorganisms which exhibit antagonistic properties against present undesirable strains of microorganisms, so as to restrain the growth of these or establishing of new undesirable species.
Patent PL-186005-B1 (PL)
Title: Composition for treating creatine substances which incorporates at least one grafted silicone polymer containing a polisiloxane skeleton grafted with non-silicone organic polymersand at least one liquid c11-c26 hydrocarbon
Inventor: DUBIEF CLAUDE
IPC: A61K8/89
Filed: 1996-09-16
Abstract: PCT No. PCT/FR96/01434 Sec. 371 Date Dec. 30, 1997 Sec. 102(e) Date Dec. 30, 1997 PCT Filed Sep. 16, 1996 PCT Pub. No. WO97/12585 PCT Pub. Date Apr. 10, 1997The present invention relates to a composition for the treatment of keratinous material, in particular human hair, comprising, in a cosmetically or dermatologically acceptable medium, at least one grafted silicone polymer, containing a polysiloxane skeleton grafted with non-silicone organic monomers and at least one hydrocarbon which is liquid at room temperature, the hydrocarbon chain of which has from 11 to 26 linear or branched, cyclic or acyclic carbon atoms, as well as its applications. The compositions according to the invention are used in particular as rinse-out products or as leave-in products, in particular for the washing, care and conditioning of the hair, for maintaining the hairstyle or for shaping the hairstyle.
Patent PL-189666-B1 (PL)
Title: Method of obtaining amlopidine benzenosulphonate
Inventor: WLOSTOWSKI MAREK
IPC: C07D211/90
Filed: 1998-04-09
Abstract: A process for the preparation of amlodipine benzenesulphonate is disclosed, wherein a salt of amlodipine with an inorganic or organic acid is reacted with alkali metal benzenesulphonate in an aqueous medium or in a mixture water-alcohol C1-C2. Amlodipine benzenesulphonate is used for the preparation of a medicament having calcium channel blocking activity, useful in the treatment of the coronary disease and arterial hypertension.
Patent PL-180429-B1 (PL)
Title: Drilling bit
IPC: E21B10/36
Filed: 1996-11-22
Abstract: Described is a drill bit (1), in particulare a bit for a percussion or rotary-percussion drill, the tip of the bit having cutting edges (3, 4) designed to detach and/or break up the material to be removed, at least one cutting edge (4) running in a curve radially across the face (2) of the bit. The invention calls for at least one additional, straight, cutting edge (3) located on the convex side of the curved cutting edge (4).