GB1379717A - Machine for cutting and welding a thermoplastics web - Google Patents

Machine for cutting and welding a thermoplastics web

Info

Publication number
GB1379717A
GB1379717A GB3319673A GB3319673A GB1379717A GB 1379717 A GB1379717 A GB 1379717A GB 3319673 A GB3319673 A GB 3319673A GB 3319673 A GB3319673 A GB 3319673A GB 1379717 A GB1379717 A GB 1379717A
Authority
GB
United Kingdom
Prior art keywords
shaft
die
arms
setting device
transmission
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
GB3319673A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
STIEGLER K STIEGLER MASCHINENF
Original Assignee
STIEGLER K STIEGLER MASCHINENF
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by STIEGLER K STIEGLER MASCHINENF filed Critical STIEGLER K STIEGLER MASCHINENF
Publication of GB1379717A publication Critical patent/GB1379717A/en
Expired legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/02—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure
    • B29C65/18—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by heating, with or without pressure using heated tools
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
    • B29C65/74—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area
    • B29C65/743—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor by welding and severing, or by joining and severing, the severing being performed in the area to be joined, next to the area to be joined, in the joint area or next to the joint area using the same tool for both joining and severing, said tool being monobloc or formed by several parts mounted together and forming a monobloc
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/01—General aspects dealing with the joint area or with the area to be joined
    • B29C66/05—Particular design of joint configurations
    • B29C66/10—Particular design of joint configurations particular design of the joint cross-sections
    • B29C66/11—Joint cross-sections comprising a single joint-segment, i.e. one of the parts to be joined comprising a single joint-segment in the joint cross-section
    • B29C66/112—Single lapped joints
    • B29C66/1122—Single lap to lap joints, i.e. overlap joints
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
    • B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
    • B29C66/43—Joining a relatively small portion of the surface of said articles
    • B29C66/431—Joining the articles to themselves
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/70—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material
    • B29C66/73—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/739—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset
    • B29C66/7392—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic
    • B29C66/73921—General aspects of processes or apparatus for joining preformed parts characterised by the composition, physical properties or the structure of the material of the parts to be joined; Joining with non-plastics material characterised by the intensive physical properties of the material of the parts to be joined, by the optical properties of the material of the parts to be joined, by the extensive physical properties of the parts to be joined, by the state of the material of the parts to be joined or by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of the parts to be joined being a thermoplastic or a thermoset characterised by the material of at least one of the parts being a thermoplastic characterised by the materials of both parts being thermoplastics
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/81—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps
    • B29C66/818—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps
    • B29C66/8181—General aspects of the pressing elements, i.e. the elements applying pressure on the parts to be joined in the area to be joined, e.g. the welding jaws or clamps characterised by the cooling constructional aspects, or by the thermal or electrical insulating or conducting constructional aspects of the welding jaws or of the clamps ; comprising means for compensating for the thermal expansion of the welding jaws or of the clamps characterised by the cooling constructional aspects
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/822—Transmission mechanisms
    • B29C66/8221—Scissor or lever mechanisms, i.e. involving a pivot point
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/82—Pressure application arrangements, e.g. transmission or actuating mechanisms for joining tools or clamps
    • B29C66/824—Actuating mechanisms
    • B29C66/8242—Pneumatic or hydraulic drives
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/83—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools
    • B29C66/832—Reciprocating joining or pressing tools
    • B29C66/8322—Joining or pressing tools reciprocating along one axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C66/00—General aspects of processes or apparatus for joining preformed parts
    • B29C66/80—General aspects of machine operations or constructions and parts thereof
    • B29C66/84—Specific machine types or machines suitable for specific applications
    • B29C66/851—Bag or container making machines
    • B29C66/8511—Bag making machines

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Fluid Mechanics (AREA)
  • Thermal Sciences (AREA)
  • Lining Or Joining Of Plastics Or The Like (AREA)

Abstract

1379717 Seaming non-metallic sheet material K STIEGLER [trading as FELIX STIEGLER MASCHINENFABRIK] 12 July 1973 [20 July 1972] 33196/73 Heading B5K A machine for simultaneously cutting and welding a longitudinally folded thermoplastics web to form bags comprises a heated welding die 4, Fig. 1, carried by a die holder 5 and which, in use, extends across the web and is movable relatively to a support 2 by a transmission which, with the holder 5, constitutes a unit adjustable by a first setting device 74, 81, 82, 84, the first setting device having an abutment 75, 86 which keeps the unit in operative condition, there being provided a second setting device 62, 63, 67 by which the unit is movable from operative to inoperative position in which latter position the die 4 no longer contacts the support 2 during any part of its stroke. The support 2, Fig. 1, comprises a roller rotatable by a pinion 3 to move the thermoplastic web to be cut and welded into bags stepwise. The holder 5 comprises a cross beam whose ends 9 are displaceable upwardly against pressure springs 7 in two vertically movable slides 6 which are mounted between four rollers 13, Fig. 3. Each slide 6 is releasably connected to an eccentric transmission 14 comprising a circular cam disc 15 eccentrically mounted on a driving shaft 16 driven by a gear 17 from the main shaft of the machine. In the operative position of the machine, a cam follower roll 18 rotatably mounted between the arms of a fork 21 attached to each slide 6 is pressed against the cam 15 by springs 22, 23. Piston-rods 27 of pistons 26 in double-acting cylinders 24 carry abutments 28 which co-operate with abutments 29 on the forks 21. In the operative position of Fig. 1, the pistons 26 are held in their lowermost positions by a force greater than the maximum tension produced by the springs 22, 23. During heating of the die 4 or in an emergency, the die 4 is lifted away from the support 2 and is disconnected from the transmission 14 by raising the pistons 26 and thus the slides 6 through the co-operation of the abutments 28, 29. When the die 4 is lowered again, a limit switch 34 is closed by one of the abutments 28 so that the support 2 and the shaft 16 are driven again. The shaft 16 is mounted on arms 35, Figs. 3 and 4, pivoted on pins 46 and each having a slot 37 in which is seated a pin 38 eccentrically fixed to a disc 36 eccentrically fixed to a shaft 39 parallel to the shaft 16. Rotation of the shaft 39 causes up-and-down movement of the transmission 14 and the slides 6. The first setting device comprises an arm 74 Figs. 1, 5 and 6, having a slot 75 in which is seated a bolt 76 supported by parallel arms 77, 78 of a clamp 79 non-rotatably connected to the shaft 39. An eccentric pin 81 is seated in a bore 80 in the arm 74 and is attached to a shaft 82 rotatable by a handle 84. A shock absorber 85 having a buffer 86 permanently bearing against the bolt 76 is fixed to the arm 74 to absorb vibrations. Alteration of the uppermost position of the die 4 is effected by turning the handle 84 so that the pin 81 displaces the arm 74 and thus the bolt 76 turns the arms 77, 78 and hence the shaft 39. Rotation of the shaft 39 causes the pins 38 to pivot the arms 35 about the pins 46 to raise or lower the transmission 14 and thus to increase or reduce the stroke of the die 4 and the welding period. The second setting device comprises a pneumatic cylinder 62, Figs. 1, 3 and 4, pivotable about a pin 64 on a fixed bracket 65. One arm 67 of a clamp 68 is inserted between the two arms of a fork 66 adjustably mounted on the piston-rod 63, the clamp 68 being pivoted to the fork 66 by a pin 69. The clamp 68 is non- rotatably connected to the shaft 39. When the rod 63 is moved out of the cylinder 62, the clamp 68 and the shaft 39 are rotated counter-clockwise so that the pins 38 pivot the arms 35 about the pins 46 so that the shaft 16 is raised above the position determined by the first setting device without the setting of this device being altered and without disconnecting the transmission 14. The drive of the welding machine is described, Fig. 7 (not shown), and electric and pneumatic control circuits for the second setting device are described, Figs. 8 and 9 (both not shown).
GB3319673A 1972-07-20 1973-07-12 Machine for cutting and welding a thermoplastics web Expired GB1379717A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE2235479A DE2235479B2 (en) 1972-07-20 1972-07-20 Machine for the cut-off welding of thermoplastic plastic sheets

Publications (1)

Publication Number Publication Date
GB1379717A true GB1379717A (en) 1975-01-08

Family

ID=5851083

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3319673A Expired GB1379717A (en) 1972-07-20 1973-07-12 Machine for cutting and welding a thermoplastics web

Country Status (3)

Country Link
DE (1) DE2235479B2 (en)
FR (1) FR2193692B1 (en)
GB (1) GB1379717A (en)

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107128276A (en) * 2017-05-16 2017-09-05 辽宁工业大学 A kind of safe air bag for vehicle driver bag folding machine
CN107889370A (en) * 2017-11-14 2018-04-06 杭州可靠性仪器厂 SMD components pin correcting device
CN108673152A (en) * 2018-07-10 2018-10-19 临沂大学 A kind of shape extrusion device
CN108811482A (en) * 2018-09-05 2018-11-13 深圳市鼎晖伟业自动化设备有限公司 A kind of multistation suspension plug-in machine
CN111559112A (en) * 2019-02-13 2020-08-21 宁波佳为机械技术有限公司 Die changing device of press machine
CN112318039A (en) * 2020-11-20 2021-02-05 湖南九方焊接技术有限公司 Positioning tool for welding axle body
CN112963144A (en) * 2021-02-02 2021-06-15 北京中石曙光科技有限公司 Small-diameter micro-resistivity scanning imager
CN113431521A (en) * 2021-08-04 2021-09-24 黄燕平 Equipment for replacing oil well wellhead back pressure valve in oil exploitation
CN114043730A (en) * 2021-12-03 2022-02-15 广东赛普电器制造有限公司 Crimping equipment
CN116373208A (en) * 2023-03-31 2023-07-04 宁波永成双海汽车部件股份有限公司 Embedded nut insert jig and application method thereof
CN116652469A (en) * 2023-07-25 2023-08-29 湖南湘船钢构有限公司 Welding device and method for steel structure bridge construction
CN116944743A (en) * 2023-08-16 2023-10-27 浙江振兴阿祥集团有限公司 Self-adjusting supporting tool for welding spiral case ring seat of water turbine
CN117340167A (en) * 2023-12-04 2024-01-05 中铧智能科技(山东)有限公司 Cable type steel wire ring core ring looping and welding integrated device

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2556968C2 (en) * 1975-12-18 1985-04-18 Hans 5216 Niederkassel Lehmacher Machine for the production of bags, sacks or similar packaging from a thermoplastic plastic film web
DE3327637A1 (en) * 1983-07-30 1985-02-14 Franz Bendig MACHINE FOR CUTTING AND / OR WELDING TRACKS OF THERMOPLASTIC PLASTIC FILM
CN108545527B (en) * 2018-06-12 2024-02-20 广东正业科技股份有限公司 Buffering mechanism
CN109590576B (en) * 2019-01-20 2024-02-02 唐山工业职业技术学院 Welding device
CN110425843A (en) * 2019-09-12 2019-11-08 王淼江 One kind is novel to tremble a machine
CN110815677A (en) * 2019-11-25 2020-02-21 福建省睿步智能装备有限公司 Automatic carrying equipment of case shell
CN111034428A (en) * 2020-01-06 2020-04-21 山东钟金燕家纺有限公司 Cotton planting device
CN113586757B (en) * 2021-08-03 2023-04-28 东莞市埃美柯阀门有限公司 Double-switch plug valve applicable to three-way pipe and capable of adjusting drainage quantity and direction
CN113510936B (en) * 2021-08-24 2023-09-29 南京优仁建设咨询有限公司 Ear strap welding machine for producing medical surgical mask
CN114474296B (en) * 2022-01-27 2023-07-04 江苏来拾科技有限公司 Structure-adjustable edge sealing mechanism for composite board machining
CN114771967B (en) * 2022-05-17 2024-02-09 南通优护优家卫生用品有限公司 Material receiving device for bagged medical lubricant filling equipment
CN115910510B (en) * 2022-11-28 2024-06-28 山东电子职业技术学院 Resistor packaging equipment
CN117107182B (en) * 2023-10-20 2024-01-26 江苏创桓智能装备有限公司 Copper tinning device containing air knife

Cited By (21)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN107128276A (en) * 2017-05-16 2017-09-05 辽宁工业大学 A kind of safe air bag for vehicle driver bag folding machine
CN107889370A (en) * 2017-11-14 2018-04-06 杭州可靠性仪器厂 SMD components pin correcting device
CN107889370B (en) * 2017-11-14 2024-04-02 浙江杭可仪器有限公司 Chip component pin correction device
CN108673152B (en) * 2018-07-10 2023-12-22 临沂大学 Profile processing device
CN108673152A (en) * 2018-07-10 2018-10-19 临沂大学 A kind of shape extrusion device
CN108811482A (en) * 2018-09-05 2018-11-13 深圳市鼎晖伟业自动化设备有限公司 A kind of multistation suspension plug-in machine
CN108811482B (en) * 2018-09-05 2023-12-26 深圳市鼎晖伟业自动化设备有限公司 Multi-station hanging plug-in machine
CN111559112A (en) * 2019-02-13 2020-08-21 宁波佳为机械技术有限公司 Die changing device of press machine
CN112318039A (en) * 2020-11-20 2021-02-05 湖南九方焊接技术有限公司 Positioning tool for welding axle body
CN112963144A (en) * 2021-02-02 2021-06-15 北京中石曙光科技有限公司 Small-diameter micro-resistivity scanning imager
CN113431521B (en) * 2021-08-04 2022-11-15 濮阳市宝利通石油机械有限公司 Equipment for replacing oil well wellhead back pressure valve in oil exploitation
CN113431521A (en) * 2021-08-04 2021-09-24 黄燕平 Equipment for replacing oil well wellhead back pressure valve in oil exploitation
CN114043730A (en) * 2021-12-03 2022-02-15 广东赛普电器制造有限公司 Crimping equipment
CN116373208A (en) * 2023-03-31 2023-07-04 宁波永成双海汽车部件股份有限公司 Embedded nut insert jig and application method thereof
CN116373208B (en) * 2023-03-31 2023-09-08 宁波永成双海汽车部件股份有限公司 Embedded nut insert jig and application method thereof
CN116652469A (en) * 2023-07-25 2023-08-29 湖南湘船钢构有限公司 Welding device and method for steel structure bridge construction
CN116652469B (en) * 2023-07-25 2023-10-13 湖南湘船钢构有限公司 Welding device and method for steel structure bridge construction
CN116944743A (en) * 2023-08-16 2023-10-27 浙江振兴阿祥集团有限公司 Self-adjusting supporting tool for welding spiral case ring seat of water turbine
CN116944743B (en) * 2023-08-16 2024-01-30 浙江振兴阿祥集团有限公司 Self-adjusting supporting tool for welding spiral case ring seat of water turbine
CN117340167A (en) * 2023-12-04 2024-01-05 中铧智能科技(山东)有限公司 Cable type steel wire ring core ring looping and welding integrated device
CN117340167B (en) * 2023-12-04 2024-02-27 中铧智能科技(山东)有限公司 Cable type steel wire ring core ring looping and welding integrated device

Also Published As

Publication number Publication date
FR2193692A1 (en) 1974-02-22
FR2193692B1 (en) 1976-09-17
DE2235479B2 (en) 1980-11-27
DE2235479A1 (en) 1974-01-31

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Legal Events

Date Code Title Description
PS Patent sealed
732 Registration of transactions, instruments or events in the register (sect. 32/1977)
PCNP Patent ceased through non-payment of renewal fee