baber/WOPTO huggingface dataset:
Patent TW-I280207-B (TW)
Title: Intelligent chassis mechanism with strain detecting
Inventor: GU HUAN-LUNG
IPC: B62D21/17
Filed: 2005-06-10
Granted: 2007-05-01
Abstract: An intelligent chassis mechanism with strain detecting for combination with a vehicle includes at least one strain sensor for detecting direction and magnitude of any strain working on each strain sensor to enable the chassis mechanism to be a large strain detecting unit. The chassis mechanism can be combined with microcomputer artificial intelligence (AI) to detect how much strain the vehicle takes, being low-cost and providing the microcomputer installed in the modernized vehicle with information to enable the AI vehicle to be more intelligent.
Patent TW-I253769-B (TW)
Title: Light-emitting diode backlight module formed with photoluminescent phosphor
Inventor: LU SHU-TUNG
IPC: H01L33/00
Filed: 2005-06-21
Granted: 2006-04-21
Abstract: Light-emitting diode (LED) backlight module includes a light guide plate, an LED element, and photoluminescent phosphor. The photoluminescent phosphor is formed on the surface of the light guide plate, within the light guide plate or on the housing of the LED element. The light generated by the LED element will mix with light excited by the photoluminescent phosphor to form light of a different color.
Patent TW-I258542-B (TW)
Title: Fastening device
Inventor: WU MING-DE
IPC: A47B88/00
Filed: 2005-07-19
Granted: 2006-07-21
Abstract: A fastening device includes an external sleeve. The external sleeve is installed with an internal sleeve therein. The internal sleeve is installed with a spring and a locking pawl therein. The top end of the locking pawl is tightly combined with the external sleeve. The opening end of the internal sleeve is formed with a combination part capable of being tightly combined with an article. Thus, when the external sleeve is pulled and rotated, the bottom of the external sleeve abuts the top end of the internal sleeve so that the locking pawl shrinks into the internal sleeve. On the other hand, when the external sleeve is rotated to move downwards, the internal sleeve shrinks into the external sleeve, and the locking pawl is protruded from the internal sleeve, thereby achieving the objective of rapidly positioning another article moving on the article.
Patent TW-I274597-B (TW)
Title: Manufacturing method of golf club head
Inventor: HSU YIN-SEN
IPC: A63B53/04
Filed: 2005-07-21
Granted: 2007-03-01
Abstract: The present invention relates to a manufacturing method of golf club head, sequentially comprising steps of a manufacture preparing step, a laser-cutting step, and a binding step. Firstly, manufacture a golf club head main body made of metal material and a subject for cut. In the laser-cutting step, control the frequency of laser beam within a range of 10 to 500 Hz, the current within a range of 14 to 17A, the power within a range of 1500 to 4000 W, and the moving speed within a range of 0.5 to 2 M/min. Then, cut the subject for cut into the preset attacking surface plate (the kneading board) in advance. Next, combine the attack kneading board union to club head main body. Thereby, the final assembly of golf club head of the present invention is finished.
Patent TW-I257654-B (TW)
Title: Micro particle mixing chip
Inventor: SHEEN HORN-JIUNN
IPC: H01L21/02
Filed: 2005-08-02
Granted: 2006-07-01
Abstract: A micro particle mixing chip and method of operating thereof are provided. The micro particle mixing chip comprises the first substrate and at least a parallel electrode array. The first substrate comprises at least a micro-channel. Electrodes are parallel arranged, and the parallel electrode array is disposed in the channel on the first substrate and is composed with a plurality of electrodes. Another micro particle mixing chip comprising the first substrate, at least one of parallel electrode array and the second substrate having at least one of a micro-channel, is provided. The parallel electrode is disposed on the first substrate and is composed with a plurality of electrodes. The electrodes are also parallel arranged. The second substrate, comprising at least one of a micro-channel, is disposed on the first substrate. And the micro-channel passes through the parallel electrode array. By operating the micro particle mixing chip, dielectric particles can be manipulated to mix two or more different fluids at the above area of the parallel electrode array.
Patent TW-I266040-B (TW)
Title: Combination balance
Inventor: HIGUCHI HIROSHI
IPC: G01G19/387
Filed: 2005-11-11
Granted: 2006-11-11
Abstract: To provide a combination balance capable of preventing a measured object from being bitten in a packer under a high speed operation, and capable of preventing an event where the measured objects are entangled each other in a collection hopper or the like to disturb falling-down thereof. This balance has a relation, to the packer 21, that a bag storage time required for storing in a bag the measured object falling down from the collection hopper 4 when a gate of the collection hopper 4 is opened all the time is longer than a sealing stop time until sealing for an upper end of the optional bag is started after sealing of a lower end of the bag is finished when the bag is made in order by the packer 21, and a control part 10 closes the gate of the collection hopper 4 at the latest just before one portion of the measured object discharged from a weighing hopper 1 reaches the collection hopper 4, controls it before all the portion of the measured object reaches the collection hopper 4 and after a fixed time clocked from the closing of the gate of the collection hopper 4, and shortens the bag storage time up to a time within the sealing stop time of the packer, by closing the gate of the collection hopper 4 for a fixed time.
Patent TW-I350323-B (TW)
Title: Method for production of a velvet ribbon with double-sided nap and ribbon weaving machine for carrying out said method
Inventor: MARTIN MUELLER
IPC: D03D35/00
Filed: 2006-03-29
Granted: 2011-10-11
Abstract: A velvet ribbon with double-sided nap is produced by weaving three superimposed webs (8, 10, 12) connected to each other by nap threads (14). The nap threads (14) of the above triple web are separated between the middle web (8) and a first web (10) in a first cutting device (36, 36a). In a second cutting device (46, 46a) the nap threads between the middle web (8) and the second web (12) are separated to give the middle web as a double-sided velvet ribbon (8). The corresponding ribbon weaving machine (2) comprises three superimposed weaving points (31) each with a weft introduction body and a common shedding device (16). A first cutting device (36) for cutting the nap threads (14a) between the middle web (8) and a first web (12) and a second cutting device (46) for cutting the nap threads (14b) between the middle web (8) and the second web (10) are provided afterwards. The velvet ribbon (8) produced thus has a nap (56, 58) on both sides.
Patent TW-I403813-B (TW)
Title: Array substrate, method of manufacturing the same and liquid crystal display panel having the same
Inventor: MOON YEON KYU
IPC: H01L29/786
Filed: 2006-06-30
Granted: 2013-08-01
Abstract: An array substrate includes a display region having a plurality of pixel parts and a peripheral region surrounding the display region. The array substrate also includes a switching element, a pixel element, a metal pattern, a pixel electrode pattern and an alignment layer. The switching element is in each of the pixel parts. The switching element is electrically connected to gate and source lines. The pixel electrode is electrically connected to the switching element. The metal pattern part is in the peripheral region. The pixel electrode pattern part is on the metal pattern part. The alignment layer is on the pixel electrode and the pixel electrode pattern part. Therefore, the array substrate may be securely combined with an alignment substrate to improve an impact resistance of a display device.
Patent TW-I409458-B (TW)
Title: Methods of using gpr119 receptor to identify compounds useful for increasing bone mass in an individual
Inventor: CHU ZHI-LIANG
IPC: C12N15/11
Filed: 2007-04-10
Granted: 2013-09-21
Abstract: The present invention relates to methods of using GPR119 receptor to identify compounds useful for increasing bone mass in an individual. Agonists of GPR119 receptor are useful as therapeutic agents for treating or preventing a condition characterized by low bone mass, such as osteoporosis, and for increasing bone mass in an individual. Agonists of GPR119 receptor promote bone formation in an individual.
Patent TW-I412257-B (TW)
IPC: H04L7/02
Filed: 2009-03-20
Granted: 2013-10-11
Abstract: A joint carrier synchronization and channel equalization method for OFDM systems, that is suitable for use in a receiver of said orthogonal frequency division multiplexer (OFDM) systems, comprising the following steps: firstly, receiving a reception signal sample of an OFDM symbol, and obtaining simultaneously a phase error and a gain error on each sub-channel in a frequency domain, through outputting a sub-channel signal on each said sub-channel in said frequency domain; next, obtaining an execution carrier frequency offset factor, an execution phase compensation factor, and an execution gain compensation factor based on said phase error and said gain error; and finally, eliminating a phase offset of said reception signal sample of a next symbol in a time domain based on said factors, and compensating a magnitude distortion and a phase distortion on each said sub-channel in said frequency domain for said reception signal of said next symbol.
Patent TW-I404603-B (TW)
Title: Safety device for preventing a tool misfire
Inventor: LAI CHUNCHIH
IPC: B25C1/04
Filed: 2009-04-03
Granted: 2013-08-11
Abstract: A pneumatic nail gun includes a gun body, a connecting mechanism, an acting valve, a trigger, a safety valve, and a trigger valve. The gun body includes a safety compressed air inlet and a firing compressed air inlet. The connecting mechanism is slidably disposed on the gun body. The acting valve is connected to the connecting mechanism. The trigger is connected to the gun body. The safety valve is connected to the acting valve for allowing a safety compressed air coming from the compressed air source to drive the acting valve to move the connecting mechanism forwards when the trigger is pulled. The trigger valve releases a firing compressed air coming from the compressed air source to project at least one nail only when the trigger is pulled, a workpiece blocks the connecting mechanism, and the trigger opens the trigger valve.
Patent TW-I414138-B (TW)
Title: Resonant converting apparatus and synchronous rectification circuit
Inventor: ZHOU LIUCHUN
IPC: H02M3/145
Filed: 2009-05-18
Granted: 2013-11-01
Abstract: A resonant converting apparatus including: a resonant circuit, a bridge converter, and a synchronous rectification circuit. The resonant circuit has a transformer. The bridge converter is connected with the primary side of the transformer, and operates according to a switching signal. The synchronous rectification circuit contains a pair of rectification transistors and a pair of driving circuits. The driving circuits are correspondingly connected with the rectification transistors, and respectively sense the current passed through the rectification transistors to output a sensing signal, and then the driving circuits respectively produce a driving signal according to the switching signal and the sensing signal to drive the connected rectification transistor. Thereof, the present can achieve the purpose of increasing the efficiency of the resonant converting apparatus.
Patent TW-I410909-B (TW)
IPC: G09F9/00
Filed: 2009-05-26
Granted: 2013-10-01
Abstract: This invention relates to a flexible solar digital display, which includes a supporting base, a rotating device, a display device and a circuit device. The supporting base has a housing. The display device includes a flexible photovoltaic panel capable of generating electricity when being radiated by light, and a flexible display panel. The photovoltaic panel and display panel can be wound and stored inside the housing when not in use. Thus, the volume of the flexible solar digital display can be smaller without occupying much space. When in use, the photovoltaic panel and the display panel can be unwound and extended out of the housing so that the photovoltaic panel can be radiated by light and converts the light energy into electric energy for being provided to the circuit device to use, thereby achieving the efficacies of space-saving and energy-saving.
Patent TW-I403663-B (TW)
Title: Led light emitting device
Inventor: LAI CHIH MING
IPC: F21S2/00
Filed: 2010-07-20
Granted: 2013-08-01
Abstract: An LED light emitting device includes a lamp housing, an LED light emitting component thermally attached to the lamp housing, a power source driver for providing electric energy for the LED light emitting component, and a temperature sensor attached to the lamp housing for sensing a surface temperature of an outer surface of the lamp housing. When the value of the surface temperature is smaller than a predetermined temperature value, the temperature sensor outputs a control signal to the power source driver to control the power source driver to supply a larger electric current to the LED light emitting component, and the LED light emitting component generates more heat to the lamp housing to increase the surface temperature thereof.
Patent GB-2477464-B (GB)
Title: Device and method for the control of an automatic transmission and of a motor vehicle
Inventor: RAMPF KLAUS-DIETER
IPC: B60K20/06
Filed: 2009-11-04
Granted: 2013-06-05
Abstract: A device and a method are provided for the actuation and for the control of an automatic transmission of a motor vehicle with at least one actuation element arranged on a steering device of the vehicle, which is designed for the manual selecting or activating of an operating state of the vehicle and/or of its transmission, wherein the at least one actuation element is optionally transferred into a rest position or into an actuation position and wherein the actuation element can be exclusively actuated in the actuation position for selecting or activating the transmission or vehicle function, while in its rest position it stays in a position that is not visible to the driver.
Patent GR-6174-B (GR)
Title: Συλλεκτηρ απορριματων.
Inventor: LINDE HILDING
Filed: 1936-11-28
Abstract: ν δοχείον συλλεκτήρος απορριμμάτων, επί ενός τροχοφόρου ή μη χαρακτηρίσαντες δια του εφοδιασμού εντός μιας θήκης ή παρόμοιας, η οποία ανοίγει εντός ενός δοχείου, ενός περιστροφικού μεταφορικού έλικος, όστις εκτείνεται μετά τίνος δοκού, κατά προτίμησιν μόνον ενός μέρους της αποστάσεως του αντίθετου τοίχους δοχείου και το οποίον υιοθετηθεί να πιέζειτα απορρίμματα έξω της ρηθείσης θήκης και εντός του δοχείου παρά την δημιουργηθείσα ήδη υπό των απορριμμάτων πίεσιν εντός του δοχείου.
Patent GR-12679-B (GR)
Title: Διαταξις μεθ' ενος σωληνος εκκενωσεως.
Filed: 1942-06-26
Abstract: υσκευή μετά σωλήνος εκκενώσεως, εις την οποίαν παράγεται δέσμη ηλεκτρονίων, εις την οποίαν η ταχύτης των ηλεκτρονίων εν τη δέσμη ρυθμίζεται υπό ρυθμιστικής ταλαντώσεως, μετά τούτο δε αι μεταβολαί ταχύτητος μεταβάλλονται εις μεταβολάς εντάσεως, δια τούτου διακρινομένη, ότι η μετατροπή των μεταβολών ταχύτητος εις μεταβολάς εντάσεως γίνεται τη βοηθεία διατρήτου ηλεκτροδίου  πεδούντος πεδίου, το οποίον αναστρέφει την διεύθυνσιν κινήσεως των ηλεκτρονίων, των οποίων η ταχύτης κείται κάτωθεν ορισμένηςτιμής, κατά την διάρκειαν της μετατροπής των μεταβολών ταχύτητος εις μεταβολάς εντάσεως κατά τοιούτον τρόπον, ώστε τα ηλεκτρόνια ταύτα διέρχονται διατου συστήματος ρυθμιστικών ηλεκτροδίων δια δευτέραν φοράν, ενώ η διεύθυνσις κινήσεως των ταχυτέρωνηλεκτρονίων παραμένει αμετάβλητος.
Patent GR-15428-B (GR)
Title: Διαταξις δια την θραυσιν και απομακρυνσιν ενος εκλεπιων, εκ σφυρηλατησεως, προερχομενων, σκωριας ητων παρομοιων αποτελουμενου επιφανειακου στρωματος επι συρματος η παρομοιων αντικειμενων.
Filed: 1953-11-05
Abstract: ιάταξις προς θραύσιν, επί ενός σύρματος ή τινος παρομοίου, ενός επιφανειακού στρώματος αποτελουμένου εκ λεπίων εκ σφυρηλατήσεως προερχομένων, εκ σκωρίας ή των παρομοίων, διακρινομένη εκ τούτου, ότι εις τα δύο ημίση (a,b) μιας διηρημένης κατά μήκος και ανοιγομένης σωληνοειδούς θήκης εδράζονται ελευθέρως περιστρεφόμενα έλαστρα (e,f,g,h) μετά μεταβαλλομένης αξονικής διευθύνσεως, κατά τοιούτον τρόπον, ώστε, εν σύρμα 1, το οποίον ανοιγομένης της θήκης (a,b) τοποθετείται μεταξύ αυτών, και κλειομένηςτης θήκης διαβιβάζεται μεταξύ αυτών, τα έλαστρα ταύτα υποβάλλουν εις λυγισμόν και συστροφήν διαδοχικώς καθ' όλας τας κατευθύνσεις.
Patent GR-18564-B (GR)
Title: Μεθοδος δια την παρασκευην των εις την 4-θεσιν υποκατεστημενων 1, 2 - διαρυλο - 3, 5 - διοξο - πυραζολιδινων.
Filed: 1956-06-09
Abstract: έθοδος προς παρασκευήν των εις την 4-θέσιν υποκατεστημένων 1,2-διαρυλο-3,5-διοξο-πυραζυλιδινών, διακρινομένη εκ τούτου, ότι εν ικανόν προς αντίδρασινθεμελιώδες παράγωγον ενός καρβονικού οξέος του γενικού τύπου:
R - COOH
εις τον οποίον η ομάς R-CO- σημαίναι το υπόλοιπον ενός ετεροκυκλικού, ενδεχομένως υποκατεστημένου καρβονικού οξέος, φέρομεν, ενδεχομένως παρουσία ενός μέσου συμπυκνώσεως, εις αντίδρασιν με εν μηλονυλοϋδραζοβενζόλιον του γενικού τύπου:
[*]
εις τον οποίον τα Ar1 και Ar2 δηλούν φαινυλικά υπόλοιπα άτινα δύνανται να είναι υποκατεστημένα κατά τον αυτόν ή διάφορον τρόπον.
Patent GR-18710-B (GR)
Title: Κυλιομενον παραπετασμα εκ πλαστικης υλης.
Inventor: GARBACCIO LINO
Filed: 1958-01-18
Abstract: υλιόμενον παραπέτασμα εκ πλαστικής ύλης, χαρακτηριζόμενον εκ τούτου, ότι το παραπέτασμα σύγκειται εκ στοιχείων ωρισμένης κατατομής, αρθρουμένων προς άλληλα μέσω εγκίστρων (5), άτινα είναι αρθρωτά κατά την βάσιν αυτών επί μιας ανωτέρας σωληνοειδούς εγκαθίσεως (2) εκάστης κατατομής και άγονται εις λαβήν, δι' ενός μέρους έχοντος μορφήν βέλους (5α), εντός αντιστοίχων σχισμών προβλεπομένων εις το κατώτερον άκρων των κατατομών.
Patent GR-24248-B (GR)
Title: Μεθοδος δια την παρασκευην παραγωγων της 1,4 - βενζοδιαζεπινης.
Filed: 1960-12-09
Abstract: έθοδος δια την παρασκευήν παραγώγων της 1,4-βενζοδιαζεπίνης, διακρινομένη εκ τούτου, ότι μίαν β-οξίμην της 2-αμινο-βενζοφαινόνης, του γενικού τύπου:
[*]
εις τον οποίον το R δηλοί υδρογόνον, αλκύλιον,αλκενύλιον ή αραλκύλιον, το R2 είναι υδρογόνονή αλκύλιον, ρίζα αλκοξύ, τριφθορομεθύλιον ή αλογόνον,ο δε δια του Ι σημειούμενος πυρήν δεν είναι υποκατεστημένος, ή είναι μονουποκατεστημένος δια τριφθορομεθυλίου, ή μονο-υποκατεστημένος ή δις υποκατεστημένος δι' αλκυλικής ρίζης, ρίζης αλκοξυ, αλκυλοθειορίζης, υδροξυ-αλκυλοθειορίζης, αλογόνου, νιτροομάδος, αμινομάδος, αλκυλοσουμφινυλίου, αλκυλοσουλφονυλίου, ρίζης υδροξυ ή ακυλαμινορίζης, φέρομεν ειςαντίδρασιν με εν α-αλογονο-ακυλο-αλογονίδιον του γενικού τύπου:
[*]
εις τον οποίον τα Χ και Υδηλούναλογόνον, το δε R1 είναι υδρογόνον ή αλκύλιον, 
παρουσία ενός μέσου δεσμεύοντος τα οξέα, κατά την αντίδρασιν δε ταύτην το λαμβανόμενον προϊόν της αντιδράσεως δύναται να υποβάλλεται εις νίτρωσιν, αι νιτροομάδες να ανάγωνται εις αμινομάδας, και αι τελευταίαι αύται να υποβάλλωνται εις ακυλίωσιν.
Patent GR-34808-B (GR)
Title: Δοχειον καυστηρος.
Filed: 1967-11-21
Abstract: οχείον καυστήρος προς καύσιν ενός υγρού καυσίμου ιδία δι' εφαρμογήν εις μίαν εστίαν, θερμάστραν, ή μαγειρικήν εστίαν, το οποίον δοχείον καυστήρος παρουσιάζει έναν ηνορθωμένον μανδύαν με εντός τούτου διαμορφωμένα ανοίγματα εισόδου αέρος, ενώ εντός του μανδύου είναι στηριγμέναι πολλαί οριζοντίως εκτεινόμεναι πλάκες διανομής, χαρακτηριζόμενον εκ του ότι ο μανδύας εν οριζοντία τομή παρουσιάζει εν επίμηκες σχήμα.
Patent GR-35022-B (GR)
Title: Κλειδαρια με μαγνητικα κλειθρα.
Filed: 1967-11-18
Abstract: λειδαριά και κατά κύριον λόγον κύλινδρος κλειδαριάς αποτελούμενος από κέλυφος, από ένα περιστροφικόν εσωτερικόν κύλινδρον και των ενδιαμέσων μαγνητικών κλείθρων, τα οποία χάρις εις ένα μαγνητισμένο κλειδί το οποίον επιδρά επί του εσωτερικού κυλίνδρου λειτουργούν εις τρόπον ώστε η κλειδαριά να ανοίγη ή να κλείνη.  Το κύριον χαρακτηριστικόν του παρόντος σημείου είναι ότι εντός των οπών (5) και των εγκοπών (23β-130-47) δια τα κονδύλια κλείθρων (6) και δια τα συμπλεκτικά τεμάχια (26,131,48) έχουν τοποθετηθή σώματα συνδέσεως εκ σιδηρομαγνητικού υλικού (εικών 1-13).
Patent GR-80488-B (GR)
Title: Label wrapping machines
Inventor: PETER BUTCHER EDWIN
IPC: B65C9/34
Filed: 1984-09-26
Abstract: The machine has a turntable (10) with a number of equally spaced devices with hinged jaws which place the label around the can. Each pair of jaws consists of a group of three rollers which guide an endless belt. With the jaws in the open position, a label is placed on the belt by a device (42) mounted at the side of the turntable. As the turntable rotates, the label is moved to the can (8) receiving station (24). The jaws then close around the can and the overlapping edges of the label are gummed to each other. The can is then transported to a despatch conveyor (32).
Patent GR-852488-B (GR)
Inventor: SHANDER DOUGLAS
IPC: A61K31/195
Filed: 1985-10-15
Abstract: The rate and character of human hair growth including androgen-stimulated beard hair growth in intact, sexually mature males is altered by the topical application out of a dermatologically acceptable carrier of a material capable of inhibiting the action of the enzyme ornithine decarboxylase. In a preferred practice of the invention, compositions containing such materials along with anti-androgen material are employed.
Patent GR-1001351-B (GR)
Inventor: KARAPETSAS IOANNIS
IPC: A01K45/00
Filed: 1991-04-17
Abstract: Η αυτοματοποιημένη και ταχεία τροφοδοσία σφαγείου με ζώντα πουλερικά, είναι ένα μηχανικό σύστημα-συγκρότημα, το οποίο εκφορτώνει μαζικά, από φορτηγά, κλουβιά με ζώντα πουλερικά και τα προω?εί, αφού τα ξεχωρίσει ένα-ένα κλουβί, σε ραουλόδρομο που καταλήγει στο σφαγείο. Αποτελείται από δύο σιδηροτροχιές, 1, στις οποίες τροχιοδρομεί βαγονέτο, 2, με κίνηση γραναζιού πάνω σε καδένα, 6, στερεωμένη εξωτερικά της σιδηροτροχιάς. Την κίνηση δίνει μοτέρ, 8, προσαρμοσμένο στο βαγονέτο. Υπάρχει κομπλέρ, 12, και τύμπανο, 18, για περιέλιξη συρματόσχοινου, 19, και στην άκρη τούτου γάντζος, 23. Στο άκρο του ραουλόδρομου υπάρχει αναβατόρι, 38, σε καταπακτή σε σχήμα Π με κινητό μέρος 31, που κινείται με μοτέρ, με μειωτήρα, 43, οι κινήσεις ρυ?μίζονται με διακόπτες. Με τηλεχειρισμό και βοή?εια ενός αν?ρώπου στο γάντζωμα και αποσύνδεση του πρώτου κλουβιού, κά?ε ντάνας, με αυτόματες κινήσεις, γεμίζει το ραουλόδρομο με ντάνες, που μεταφέρονται μια-μια στο αναβατόρι, το οποίο προω?εί ένα-ένα κλουβί σε ραουλόδρομο για μεταφορά στο σφαγείο. Παρέχεται ακόμη ασφάλεια στο χειριστή με το σύστημα του γάντζου έλξης. ω
Patent IN-192877-B (IN)
Inventor: HEGGIE WILLIAM
IPC: C25B3/25
Filed: 1999-04-09
Abstract: The present invention refers to a process for the preparation of 4-(desdimethylamino)-tetracyclines, which compounds have a therapeutical application. The starting tetracyclines are treated with a methylating agent and the resulting trimethylammonium salts are reduced by electrolysis in an aqueous solution at acidic pH, in the presence of an adequate electrolyte. A direct electrical current with a potential of 0.5-1.5 volts is applied between two convenient electrodes until the reaction is complete. The 4-(desdimethylamino)-tetracyclines are isolated by extraction with an organic solvent.