baber/WOPTO huggingface dataset:
Patent TW-I783485-B (TW)
Title: Multi-dimensional laser process device
Inventor: CHUNG HSI FU
IPC: B23K26/00
Filed: 2021-05-17
Granted: 2022-11-11
Abstract: A multi-dimensional laser process device includes a first fix unit having has a first and a second fix members, a movement unit having a first and a second movement members, a second fix unit, and a plurality of pivotal units disposed between different units. The first fix member is disposed on one side of the second fix member. The first movement member is pivotally disposed on the second fix member away from the first fix member. The second movement member is pivotally disposed on the first movement member away from the second fix member. The second fix unit is pivotally disposed on the second movement member away from the first movement member. The second fix unit includes a laser processing head disposed on the second fix unit away from the second movement member. The present invention provides multi-dimensional process to differently sized objects.
Patent TW-I797651-B (TW)
Title: 用於晶圓自動旋轉之裝置及設備
Inventor: YANG DEZAN
IPC: H01L21/683
Filed: 2021-06-24
Granted: 2023-04-01
Abstract: 本發明係關於用於晶圓自動旋轉之裝置及設備。在本發明之一實施例中，一種晶圓旋轉裝置包含：晶圓支撐架，其經組態以沿晶圓之外周界承托並固持上述晶圓；以及旋轉單元，其經組態以承托並固持上述晶圓支撐架，上述旋轉單元與上述晶圓支撐架在加工期間保持相對位置固定。
Patent TW-I769880-B (TW)
Inventor: LIU WEI-CHIH
IPC: G06F8/656
Filed: 2021-06-29
Granted: 2022-07-01
Abstract: 本發明提供一種應用程式同步方法及高可用性系統。所述方法包括：反應於主裝置已依據一特定安裝順序安裝多個應用程式，由主裝置相應地產生一應用程式安裝清單；由主裝置發送應用程式安裝清單至各子裝置；以及由各子裝置依據應用程式安裝清單記錄的特定安裝順序安裝所述多個應用程式。
Patent TW-I788007-B (TW)
Title: System and method for automated material handling management
Inventor: HSU CHIEH
IPC: B65G49/07
Filed: 2021-09-11
Granted: 2022-12-21
Abstract: An AMHS interface management system is configured to facilitate the exchange of lot information between distinct AMHS systems. The AMHS interface management system receives lot information from a first AMHS system in a first format and translates the lot information into a format associated with a second AMHS system. The AMHS interface management system utilizes a handshake area located between the first and second AMHS systems. The handshake area includes one or more vehicles that facilitate the movement of a lot between the first AMHS system and the second AMHS system.
Patent TW-I779842-B (TW)
Title: 立體顯示裝置及其顯示方法
Inventor: CHEN JUI-LIN
IPC: H04N13/302
Filed: 2021-09-22
Granted: 2022-10-01
Abstract: 一種立體顯示裝置及其顯示方法。立體顯示裝置包括顯示面板、透鏡陣列、影像感測器以及處理電路。顯示面板顯示三維影像。透鏡陣列配置於三維影像的傳遞路徑上。影像感測器對顯示面板的觀看場域擷取感測影像。處理電路耦接至透鏡陣列與影像偵測器。處理電路依據在感測影像中參考位置的參考座標與在感測影像中使用者的人眼座標計算在觀看場域中使用者的人眼實際位置。處理電路依據人眼實際位置調整透鏡陣列的液晶旋轉角度，使三維影像的觀看位置吻合人眼實際位置。
Patent TW-I795972-B (TW)
Inventor: YOKOTA AKIHIRO
IPC: H05H1/46
Filed: 2016-10-03
Granted: 2023-03-11
Abstract: 本發明旨在提高在徑向之膜的蝕刻率分布的控制性。於一實施形態的電漿蝕刻方法中，為了對電容耦合型電漿處理裝置的載置台上所載置的被處理體的單一膜進行電漿蝕刻，而產生處理氣體的電漿。於產生該電漿的期間中，於電漿處理裝置的上部電極之上，控制供給至複數個電磁鐵的線圈的電流，以使相對於中心軸線在徑向中的單一膜的蝕刻率分布改變。
Patent TW-I782777-B (TW)
Inventor: LIN YI-CHIA
IPC: G06K9/62
Filed: 2021-11-02
Granted: 2022-11-01
Abstract: 一種影像擷取方法包含：於使用者裝置之顯示螢幕提供影像擷取區域；於影像擷取區域中提供指示區域；辨識在指示區域中的每一車牌；計算在指示區域中的每一車牌的車牌面積；計算在指示區域中的每一車牌的中心點至指示區域的中心點的中心點差距；對具有大於最大車牌面積之一半的車牌面積以及最小中心點差距的車牌進行標記；以及於影像擷取區域擷取包含被標記之車牌之影像。
Patent TW-I785978-B (TW)
Title: 金屬表面處理液回收利用系統及其操作方法
Inventor: LIAO CHONG-HENG
IPC: B01D3/10
Filed: 2022-01-27
Granted: 2022-12-01
Abstract: 本發明涉及一種金屬表面處理液回收利用系統及其操作方法，所述回
收利用系統包括依次連接的處理液收集槽、預處理裝置、奈米過濾裝置、真空蒸餾裝置和濃縮液回收槽，所述奈米過濾裝置包括進水槽、一級奈米過濾膜組和二級奈米過濾膜組，所述處理液收集槽中的處理液通過預處理裝置過濾掉固體懸浮物後進入進水槽內，所述進水槽中的廢水進入一級奈米過濾膜組過濾後形成一級濃廢液和一級滲透液，一級滲透液進入二級奈米過濾膜組再次過濾後形成二級濃廢液和二級滲透液，二級滲透液進入真空蒸餾裝置被進一步蒸發濃縮形成蒸餾水和高濃度含酸的濃縮液；本發明將奈米過濾裝置和真空蒸餾裝置相結合，得到高濃度的含酸濃縮液進行回收利用，符合資源利用的最大化。
Patent TW-I802321-B (TW)
Title: Laterally double diffused metal oxide semiconductor device
Inventor: CHEN PO-AN
IPC: H01L29/06
Filed: 2022-03-17
Granted: 2023-05-11
Abstract: A laterally double diffused metal oxide semiconductor device includes a substrate with a well region, a body doped region in the well region, a body pick-up region in the body doped region, source regions at two sides of the body pickup region in the body doped region, drain regions, a thick oxide layer between the drain region and the body doped region, finger gates, conductive structures, and a gate insulating layer. The thick oxide layer defines the active region. The finger gates are respectively disposed outside the source regions on the active region, wherein each of the finger gates includes branch parts, and the branch parts are arranged parallel to each other and extend above the thick oxide layer. The conductive structures are between the branches and across the active region and the thick oxide layer, wherein the conductor structures are electrically insulated from the finger gates. The gate insulating layer is disposed between the finger gate and the active region and between the conductor structure and the active region.
Patent TW-I804242-B (TW)
Inventor: LIN BI-LY
IPC: G02B1/11
Filed: 2022-03-21
Granted: 2023-06-01
Abstract: An electronic device is provided. The electronic device includes: a first light 
modulation assembly, including: a first substrate; a second substrate opposite to the first substrate; a first conductive layer disposed on the first substrate; a second conductive layer disposed on the second substrate; a first insulating layer disposed on the first substrate; and a first light modulation layer disposed between the first conductive layer and the second conductive layer.
Patent TW-I808006-B (TW)
Title: 基板乾燥裝置、基板處理裝置及基板乾燥方法
Inventor: MATSUSHITA JUN
IPC: H01L21/67
Filed: 2022-09-23
Granted: 2023-07-01
Abstract: 本發明提供一種能夠以簡單的結構減少圖案閉塞的發生的基板乾燥裝置、基板處理裝置及基板乾燥方法。實施方式的基板乾燥裝置包括：加熱部（36）；第一揮發性溶劑供給部（34）；第二揮發性溶劑供給部（35），供給第二揮發性溶劑（H），所述第二揮發性溶劑（H）包含撥水化劑且氣化時的表面張力比第一揮發性溶劑（V）小；乾燥室（31），在其中搬入形成有液膜的基板（W）；驅動機構，使基板（W）旋轉；以及控制裝置（400），從第一揮發性溶劑供給部（34）供給第一揮發性溶劑（V），將液膜置換為第一揮發性溶劑（V），並從第二揮發性溶劑供給部（35）供給第二揮發性溶劑（H），將形成於基板（W）上的第一揮發性溶劑（V）置換為第二揮發性溶劑（H），並且形成撥水化膜，使加熱部（36）對基板（W）進行加熱，在第二揮發性溶劑（H）的液膜與基板（W）之間產生氣層，藉由旋轉所帶來的離心力將第二揮發性溶劑（H）的液膜排出。
Patent ZA-200307618-B (ZA)
Title: Dispensing device in a dishwashing machine.
Inventor: HAHN KARLHEINZ
IPC: A47L15/42
Filed: 2003-09-30
Abstract: A device for use in a dishwashing machine to dispense a water-soluble glass or ceramic composition into the machine over a plurality of dishwashing cycles comprising: a) a shaped body made of the water-soluble glass or ceramic composition; and b) a container for holding said shaped body with at least part of its walls having perforations allowing a controlled circulation of the washing liquor into and out of the container.
Patent ZA-200309240-B (ZA)
Title: Method and apparatus for clarifying a slurry.
Inventor: NYMAN BROR
IPC: B01D21/01
Filed: 2003-11-27
Abstract: The invention relates to a method of clarifying and/or thickening a solution containing solids i.e. a slurry, and the apparatus for accomplishing this. Using the method and apparatus of the present invention, the flocculant to be fed into the clarification and thickening equipment is mixed evenly and with a small shear force into the slurry in the feedwell of the apparatus. The feedwell is equipped with a mixing device. The slurry is taken onwards from the feedwell evenly into the clarification tank inside the underflow layer, which enables the separation of a clear overflow solution.
Patent ZA-200400481-B (ZA)
Title: Pharmaceutical composition for the treatment of the decline and/or damage of cognitive functions.
Inventor: GACSALYI ISTVAN
IPC: A61K31/138
Filed: 2004-01-22
Abstract: The compounds of the general Formula (I) (wherein R stands for hydrogen or methyl) can be used for the treatment or prophylaxis of diseases characterized either by the decline and/or damage of cognitive functions, or mental disability accompanying other diseases. As compound of the general Formula I preferably -(1R,2S,4R)-(-)-2-(2-dimethylaminoethoxy)-2-phenyl-1,7,7-trimethylbicyclo[2.2.1]heptane-fumarate can be used.
Patent ZA-200410124-B (ZA)
Title: Drive device
Inventor: SOMMER FRANK-UWE
IPC: E05F15/16
Filed: 2004-12-15
Abstract: The drive mechanism, e.g. for gates and garage doors etc., has a guide rail (3) in the direction of gate/door movement for a moving slide (4) with an electromotor to operate the gate/door. The motor has connections to the electrical power supply (12), fed in at one end (7,9) of the guide rail. The electrical connection is a plug (8) with a cable (11), which can be connected at either end of the guide rail.
Patent ZA-200806381-B (ZA)
Title: A process for epoxidizing propene
Inventor: GOEBBEL HANS-GEORG
IPC: C07C/
Filed: 2008-07-23
Abstract: The present invention provides a process for the epoxidation of propene which comprises reacting propene with hydrogen peroxide in the presence of methanol as solvent and a titanium zeolite catalyst, the process further comprising separating propylene oxide from the reaction mixture to obtain a mixture comprising methanol, water, at least one carboxylic acid and at least one carbonyl compound, wherein the at least one carboxylic acid is at least partially neutralized, said process optionally comprising a hydrogenation stage.
Patent ZA-202304625-B (ZA)
Title: Preparation method for a zif-derived porous carbon-supported co/se biatomic site orr catalyst
Inventor: XIAOMIN WANG
Filed: 2023-04-21
Abstract: The invention discloses a preparation method for a ZIF-derived porous carbon-supported Co/Se biatomic site ORR catalyst, the method is as follows: dimethyl imidazole, Zn(NO3)2•6H2O, Co(NO3)2•6H2O are reacted and dried to obtain a precursor, and then grind the precursor into powder and place it into a corundum boat, and quickly put the boat in an argon atmosphere. In the furnace at 950 degrees Celsius, the black precursor powder is obtained by rapid heating and heat treatment, and then mixed with selenium dioxide to grind into a uniform powder and then placed in the corundum boat in a tube furnace. The ZIF-derived porous carbon-supported Co/Se biatomic site ORR catalyst is obtained by stepwise heating treatment in an argon atmosphere. The ORR performance of the Co-Se-N-C catalyst with Co/Se diatomic sites prepared by the invention is significantly improved in acidic electrolytes, which proves the synergistic effect of Co-Nx and Se-C diatomic sites.
Patent GR-1004157-B (GR)
Title: Speed-increasing propellers arrangement for ships
Inventor: SKARTSIS DIONYSIOS IOANNI
IPC: B63H11/02
Filed: 2001-11-29
Abstract: he present invention proposes the placement of the propellers 19 on the prow so that they can act as traction propellers into still waters. In this way, the efficiency of the machines will be increased, which results in speed increase enhanced by the backward launching of water, via the ducts 10 acting as jet-aircrafts jets. The water of said ducts constitutes the constant ballast of the craft.
Patent MX-341308-B (MX)
Title: Novel use.
Inventor: GEORGIOS TZORTZIS
IPC: A61K31/702
Filed: 2010-04-23
Abstract: The present invention relates to the use of a galactooligosaccharide in the prevention or treatment of an inflammatory disorder, in particular an intestinal inflammatory disorder.
Patent MX-341235-B (MX)
Title: Vaginal insert device having a support portion with plurality of foldable areas.
Inventor: PATRICIA ANN SAMOLINSKI
IPC: A61F13/30
Filed: 2011-11-16
Abstract: Generally, a vaginal insert device used to treat urinary incontinence is disclosed. The vaginal insert device includes a support portion, a stabilizing portion, a removal device, and at least one fluid passageway extending though the support portion. The substantially cylindrical support portion has a distal end and a proximal end. In addition, the support portion has a plurality of foldable areas extending from the distal end to the proximal end. Desirably, the plurality of foldable areas helically curve as the plurality of foldable areas extend from the distal end to the proximal end. The largest outer circumference of the support portion has an insertion diameter when the plurality of foldable areas are compressed and foldable inward and an in-use diameter wherein the plurality of foldable areas are extended outward into a maximum in-use diameter position. Desirably, the in-use diameter is larger than the insertion diameter.
Patent MX-339261-B (MX)
Title: Minimum retroreflectivity compliance system, method and assembly.
Inventor: CHAPMAN SCOTT N
IPC: E01F9/619
Filed: 2012-04-12
Abstract: A system, method and assembly for performing traffic sign inspections is provided. In one embodiment, the assembly includes a first plurality of sheetings (210a-b) that each have a combination of retroreflectivity and color that is different from the combination of retroreflectivity and color of each of the other first plurality of sheetings (210a-b); a first clamp (240a) and second clamp (240b) for clamping one of said first plurality of sheetings (240a-b) to a traffic sign; a first handheld light source (235a); and a first enclosure (200) for removably housing the first plurality of sheetings (210a-b), said first and second clamps (240a-b), and said first handheld light source (235a). The assembly may further include a second enclosure for removably housing a second plurality of sheetings that each has a combination of retroreflectivity and color that is different from the combination of retroreflectivity and color of each of the other second plurality of sheetings.
Patent MX-351227-B (MX)
Title: Toxin genes and methods for their use.
Inventor: TOMSO DANIEL J
IPC: C07K14/325
Filed: 2009-06-25
Abstract: Compositions and methods for conferring pesticidal activity to bacteria, plants, plant cells, tissues and seeds are provided. Compositions comprising a coding sequence for a delta-endotoxin polypeptide are provided. The coding sequences can be used in DNA constructs or expression cassettes for transformation and expression in plants and bacteria. Compositions also comprise transformed bacteria, plants, plant cells, tissues, and seeds. In particular, isolated delta-endotoxin nucleic acid molecules are provided. Additionally, amino acid sequences corresponding to the polynucleotides are encompassed, and antibodies specifically binding to those amino acid sequences. In particular, the present invention provides for isolated nucleic acid molecules comprising nucleotide sequences encoding the amino acid sequence shown in SEQ ID NO: 61-121 and 133-141, or the nucleotide sequence set forth in SEQ ID NO: 1-60, 124-132, and 142-283, as well as variants and fragments thereof.
Patent MX-360891-B (MX)
Title: Production of highly reactive low molecular weight pib oligomers.
Inventor: SHAIKH SOHEL K
IPC: C08F10/10
Filed: 2012-06-05
Abstract: In one preferred embodiment, the present invention provides a process for the liquid phase polymerization of isobutylene to manufacture highly reactive PIB oligomers having Mn under 1000, using a catalyst composition comprising a Friedel-Crafts catalyst a complexing agent, a chain transfer agent and a polymerization-retarding agent. A chain transfer agent may be selected from: a-DIB and ß-DIB and mixtures thereof. 2,4,4-trimethylpent- 1 -ene 2,4,4-trimethylpent-2-ene (a-DIB) (ß-DIB) A polymerization- retarding agent may be selected from: 2,6-bis( 1, 1-dimethyIethyl )-4-methyIphenol ( B H T or 2,6-di-teri-butyl-4-vinylphenol.
Patent MX-357837-B (MX)
Title: Methods of inhibiting tumor growth by antagonizing il-6 receptor.
Inventor: LI ZHANG
IPC: C07K16/28
Filed: 2012-11-09
Abstract: The present invention provides methods for inhibiting or attenuating tumor growth in a subject by administering an IL-6 antagonist to the subject. In certain embodiments, the methods of the invention are used to inhibit the growth of an anti-VEGF-resistant tumor in a subject. The IL-8 antagonist may be, e.g., an antibody that spectficaiiy binds SL-6R, The 11-6 antagonist may be administered in combination with a VEGF antagonist, and/or an EGFR antagonist.
Patent MX-351502-B (MX)
Title: Albumin binding antibodies and binding fragments thereof.
Inventor: DAVID PAUL HUMPHREYS
IPC: C07K16/46
Filed: 2012-11-09
Abstract: A serum albumin binding antibody or fragment thereof comprising a heavy chain variable domain having the sequence given in SEQ ID NO: 1 or SEQ ID NO:2 and/or comprising a light chain variable domain having the sequence given in SEQ ID NO:3 or SEQ ID NO:4, in particular comprising a heavy chain variable domain and a light chain variable domain having the sequence given in SEQ ID NO: 1 and SEQ ID NO:3 or a heavy chain variable domain and a light chain variable domain having the sequence given in SEQ ID NO: 2 and SEQ ID NO:4. The disclosure also extends to polynucleotides encoding the antibodies or fragments, vectors comprising same and host cells capable of expressing the polynucleotides. The disclosure further includes pharmaceutical compositions comprising the antibodies or fragments and therapeutic used of any one of the same.
Patent MX-345098-B (MX)
Title: High octane unleaded aviation gasoline.
Inventor: HANANE BELMOKADDEM BENNIS
IPC: C10L1/22
Filed: 2014-07-25
Abstract: High octane unleaded aviation fuel compositions having a CHN content of at least 97.2 wt %, less than 2.8 wt % of oxygen content, a T10 of at most 75° C., T40 of at least 75° C., a T50 of at most 105° C., a T90 of at most 135° C., a final boiling point of less than 210° C., an adjusted heat of combustion of at least 43.5 MJ/kg, a vapor pressure in the range of 38 to 49 kPa is provided.
Patent MX-360680-B (MX)
Title: Method of producing a composite material using a mixing system.
Inventor: STEVE HICKS
IPC: E01C19/50
Filed: 2010-06-24
Abstract: A method produces a composite material using a mixing system. The composite material comprises at least one aggregate, e.g. rock and/or glass, and the reaction product of a two- component polymeric binder composition comprising a first component, e.g. an isocyanate component, and a second component, e.g. an isocyanate-reactive component. The mixing system includes a mixing apparatus. The method includes the step of providing the aggregate, the first component and the second component into the mixing apparatus. The method further includes the step of mixing the first and second components to produce the reaction product of the two- component polymeric binder composition, and the step of applying the reaction product of the two-component polymeric binder composition to the aggregate within the mixing apparatus to produce the composite material. The composite material can be used for forming a paved structure, such as a sidewalk or a roadway.
Patent MX-359954-B (MX)
Title: Nucleic acid comprising or coding for a histone stem-loop and a poly(a) sequence or a polyadenylation signal for increasing the expression of an encoded pathogenic antigen.
Inventor: JOCHEN PROBST
IPC: C12N15/67
Filed: 2013-02-15
Abstract: The present invention relates to a nucleic acid sequence, comprising or coding for a coding region, encoding at least one peptide or protein comprising a pathogenic antigen or a fragment, variant or derivative thereof, at least one histone stem-loop and a poly(A) sequence or a polyadenylation signal. Furthermore the present invention provides the use of the nucleic acid for increasing the expression of said encoded peptide or protein. It also discloses its use for the preparation of a pharmaceutical composition, especially a vaccine, e.g. for use in the treatment of infectious diseases. The present invention further describes a method for increasing the expression of a peptide or protein comprising a pathogenic antigen or a fragment, variant or derivative thereof, using the nucleic acid comprising or coding for a histone stem-loop and a poly(A) sequence or a polyadenylation signal.
Patent MX-361886-B (MX)
Title: Preparations of hydrophobic therapeutic agents, methods of manufacture and use thereof.
Inventor: CAVANAGH THOMAS
IPC: C07J71/00
Filed: 2013-05-06
Abstract: The present invention further provides method of preparing nanocrystals of a hydrophobic therapeutic agent such as fluticasone or triamcinolone, pharmaceutical compositions (e.g., topical or intranasal compositions) thereof and methods for treating and/or preventing the signs and/or symptoms of disorders such as blepharitis, meibomian gland dysfunction or skin inflammation or a respiratory disease (e.g., asthma).
Patent MX-355237-B (MX)
Title: Shuttle valve assembly and method for intercooler condensation removal.
Inventor: BASILE JAMES M
IPC: F02B29/04
Filed: 2014-12-03
Abstract: Methods and systems are provided for removing condensate from an intercooler of a turbocharged internal combustion engine. Using valves to drain condensate may create a direct fluidic connection between the compressed air of the intercooler and ambient exterior air, allowing both condensate and compressed air to escape due to valve design or failure of valve actuation devices. To provide a simple and reliable method for removing condensate without removing compressed air, a hollow valve is used to shuttle condensate from the intercooler to the exterior environment.
Patent MX-356735-B (MX)
Title: Roofing material.
Inventor: OLAN LEITCH
IPC: E04D1/12
Filed: 2015-01-23
Abstract: A roofing material is provided having an asphalt-coated mat or felt made up of or in combinations of fiberglass, polyester, nylon, cotton, cellulosic fibers or materials, polyethylene, polypropylene, co-polymers, melamine, phenolic, acrylics, polycarbonate, carbon fiber, clay, metallic in woven, non-woven, strands or sheets, styrene compounds, rubber, silk, leather, or wool in a woven, non-woven, or solid form. The surfacing materials can be made up of or in combination minerals, plastic particles or film, metal particles or film, cement particles, clay particles, paints, coatings, glass, ceramics, wood, wood fiber, or composite materials.
Patent MX-359991-B (MX)
Title: Sweetener compositions containing rebaudioside b.
Inventor: MARY QUINLAN
IPC: A23L27/30
Filed: 2013-07-31
Abstract: Sweetener compositions useful as non-caloric replacements for sugars in food and beverages are provided by combinations of monk fruit extract (containing mogroside V) with rebaudioside A and B, which have improved taste profiles as compared to other non- caloric sweeteners.
Patent MX-354342-B (MX)
Title: Storage bag with dimple features.
Inventor: JOSE PORCHIA
IPC: B65D33/16
Filed: 2013-09-26
Abstract: A storage bag has first and second closure profiles adjacent to an opening to the interior of the bag. The first and second closure profiles are provided with dimples that are aligned opposite to each other. The dimples of the first closure profile are formed as a concave surface on the side of the first closure profile facing the interior of the bag and a convex surface on the side of the first closure profile facing the outside of the bag. The dimples of the second closure profile are formed as a convex surface on the side of the second closure profile facing the interior of the bag and a concave surface on the side of the second closure profile facing the outside of the bag. The dimples of the first closure profile are at least partially within the dimples of the second closure profile when the bag is being sealed.
Patent MX-356382-B (MX)
Title: Suction muffler for a linear motor compressor and a linear motor compressor.
Inventor: LILIE DIETMAR ERICH BERNHARD
IPC: F04B17/04
Filed: 2013-12-16
Abstract: The compressor comprises a movable assembly carrying a suction muffler and formed by: a piston (10) having a skirt (11) with an open rear end (11a) and a closed front end (11b) which carries a suction valve (50); and an actuating means (30). The suction muffler comprises: a first and a second tubular insert (61,62) defining a first and a second chamber (C1,C2) and having confronting open ends (61a, 62a) spaced from each other, and closed opposite ends (61b,62b) respectively affixed to a top wall (12) of the piston (10) and to the actuating means (30); a third tubular insert (63) internally lining the skirt (11); and an annular passage (15), between the third and the second tubular inserts (63, 62), open to the first and second chambers (C1,C2), and communicating the open rear end (11a) of the skirt (11) with the suction valve (50).