GB1530305A - Manufacture of hollow amorphous bi-oriented bodies - Google Patents

Manufacture of hollow amorphous bi-oriented bodies

Info

Publication number
GB1530305A
GB1530305A GB49649/75A GB4964975A GB1530305A GB 1530305 A GB1530305 A GB 1530305A GB 49649/75 A GB49649/75 A GB 49649/75A GB 4964975 A GB4964975 A GB 4964975A GB 1530305 A GB1530305 A GB 1530305A
Authority
GB
United Kingdom
Prior art keywords
preform
section
blow
blown
preforms
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
GB49649/75A
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.)
Carnaud Total Interplastic SA
Original Assignee
Carnaud Total Interplastic SA
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 Carnaud Total Interplastic SA filed Critical Carnaud Total Interplastic SA
Publication of GB1530305A publication Critical patent/GB1530305A/en
Expired legal-status Critical Current

Links

Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C71/00After-treatment of articles without altering their shape; Apparatus therefor
    • B29C71/02Thermal after-treatment
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02Combined blow-moulding and manufacture of the preform or the parison
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/06Injection blow-moulding
    • B29C49/0665Injection blow-moulding the injection mould cavity and the blow-mould cavity being displaceable to the geometrically fixed injection core mould
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/08Biaxial stretching during blow-moulding
    • B29C49/10Biaxial stretching during blow-moulding using mechanical means for prestretching
    • B29C49/12Stretching rods
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42Component parts, details or accessories; Auxiliary operations
    • B29C49/64Heating or cooling preforms, parisons or blown articles
    • B29C49/6472Heating or cooling preforms, parisons or blown articles in several stages
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C35/00Heating, cooling or curing, e.g. crosslinking or vulcanising; Apparatus therefor
    • B29C35/02Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould
    • B29C35/08Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation
    • B29C35/0805Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation
    • B29C2035/0822Heating or curing, e.g. crosslinking or vulcanizing during moulding, e.g. in a mould by wave energy or particle radiation using electromagnetic radiation using IR radiation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42Component parts, details or accessories; Auxiliary operations
    • B29C49/78Measuring, controlling or regulating
    • B29C49/786Temperature
    • B29C2049/7861Temperature of the preform
    • B29C2049/7862Temperature of the preform characterised by temperature values or ranges
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2793/00Shaping techniques involving a cutting or machining operation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00Indexing scheme relating to blow-moulding
    • B29C2949/07Preforms or parisons characterised by their configuration
    • B29C2949/0715Preforms or parisons characterised by their configuration the preform having one end closed
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00Indexing scheme relating to blow-moulding
    • B29C2949/20Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/22Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at neck portion
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00Indexing scheme relating to blow-moulding
    • B29C2949/20Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/24Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at flange portion
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00Indexing scheme relating to blow-moulding
    • B29C2949/20Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/26Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at body portion
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00Indexing scheme relating to blow-moulding
    • B29C2949/20Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer
    • B29C2949/28Preforms or parisons whereby a specific part is made of only one component, e.g. only one layer at bottom portion
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C2949/00Indexing scheme relating to blow-moulding
    • B29C2949/30Preforms or parisons made of several components
    • B29C2949/3032Preforms or parisons made of several components having components being injected
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/04Extrusion blow-moulding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/02Combined blow-moulding and manufacture of the preform or the parison
    • B29C49/06Injection blow-moulding
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42Component parts, details or accessories; Auxiliary operations
    • B29C49/4205Handling means, e.g. transfer, loading or discharging means
    • B29C49/42073Grippers
    • B29C49/42085Grippers holding inside the neck
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42Component parts, details or accessories; Auxiliary operations
    • B29C49/4205Handling means, e.g. transfer, loading or discharging means
    • B29C49/42093Transporting apparatus, e.g. slides, wheels or conveyors
    • B29C49/42105Transporting apparatus, e.g. slides, wheels or conveyors for discontinuous or batch transport
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42Component parts, details or accessories; Auxiliary operations
    • B29C49/4205Handling means, e.g. transfer, loading or discharging means
    • B29C49/42093Transporting apparatus, e.g. slides, wheels or conveyors
    • B29C49/42107Transporting apparatus, e.g. slides, wheels or conveyors with accumulator or temporary storage, e.g. while waiting for the blowing apparatus
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42Component parts, details or accessories; Auxiliary operations
    • B29C49/4205Handling means, e.g. transfer, loading or discharging means
    • B29C49/42113Means for manipulating the objects' position or orientation
    • B29C49/42115Inversion, e.g. turning preform upside down
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29CSHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C49/00Blow-moulding, i.e. blowing a preform or parison to a desired shape within a mould; Apparatus therefor
    • B29C49/42Component parts, details or accessories; Auxiliary operations
    • B29C49/64Heating or cooling preforms, parisons or blown articles
    • B29C49/68Ovens specially adapted for heating preforms or parisons
    • B29C49/685Rotating the preform in relation to heating means
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B29WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29KINDEXING SCHEME ASSOCIATED WITH SUBCLASSES B29B, B29C OR B29D, RELATING TO MOULDING MATERIALS OR TO MATERIALS FOR MOULDS, REINFORCEMENTS, FILLERS OR PREFORMED PARTS, e.g. INSERTS
    • B29K2995/00Properties of moulding materials, reinforcements, fillers, preformed parts or moulds
    • B29K2995/0012Properties of moulding materials, reinforcements, fillers, preformed parts or moulds having particular thermal properties
    • B29K2995/0017Heat stable

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Blow-Moulding Or Thermoforming Of Plastics Or The Like (AREA)
  • Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
  • Moulds For Moulding Plastics Or The Like (AREA)

Abstract

1530305 Blow moulding oriented articles CARNAUD TOTAL INTERPLASTIC 3 Dec 1975 [4 Dec 1974] 49649/75 Heading B5A An oriented hollow body of a polyester is blow moulded from an amorphous preform at a temperature from 0-30‹ C. above the glass transition temperature. The preform itself is blow moulded from a hot extruded or injected parison in a cold mould. The blow moulded body may be cooled to solidify it and then heated, perhaps by a hot liquid to be packaged in the body, to stress-relieve it. It is preferred for the preform to have a detachable section by which it can be held during the blowing and for even the neck portion of the blown article to be oriented. In the embodiment of Fig. 1 blown preforms 3, rendered amorphous by rapid cooling, are formed in a device 2 from a parison extruded by extruder 1. The parisons are fed to a store 6 and are thence passed through a heating oven 7 on a conveyer 8 which has facility for rotating the preforms. The heated preforms are fed to a blow mould and blown into bottles 11, 13. Each preform 5 comprises a body section D1, a so-called "false-collar" D2, and a so-called "drop" D3 which is severed from the preform by a blade 4 before storage. The blow mould 14 includes a section 19 accommodating the false collar, a neck forming section 18, separated by a knife edge 20 from the section 19 and in which the upper part of the section D1 of the preform is expanded, and a body forming section. Prior to blowing through a conduit 17 in a supporting mandrel, the preform is stretched by a section 16 of the mandrel. The false collar is subsequently severed from the blown container.
GB49649/75A 1974-12-04 1975-12-03 Manufacture of hollow amorphous bi-oriented bodies Expired GB1530305A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
FR7439648A FR2293297A1 (en) 1974-12-04 1974-12-04 PROCESS FOR MANUFACTURING HOLLOW BODIES IN PLASTIC MATERIAL FROM PREFORMS, HOLLOW BODIES OBTAINED AND PREFORMED FOR THEIR OBTAINING

Publications (1)

Publication Number Publication Date
GB1530305A true GB1530305A (en) 1978-10-25

Family

ID=9145537

Family Applications (1)

Application Number Title Priority Date Filing Date
GB49649/75A Expired GB1530305A (en) 1974-12-04 1975-12-03 Manufacture of hollow amorphous bi-oriented bodies

Country Status (9)

Country Link
JP (1) JPS5182366A (en)
DE (1) DE2554281A1 (en)
DK (1) DK541075A (en)
ES (1) ES443384A1 (en)
FR (1) FR2293297A1 (en)
GB (1) GB1530305A (en)
IT (1) IT1051015B (en)
NO (1) NO754019L (en)
SE (1) SE412549B (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2145027A (en) * 1983-08-19 1985-03-20 Metal Box Plc Tubular articles of biaxially oriented polymers
EP2786949A3 (en) * 2008-04-18 2015-08-05 SACMI Cooperativa Meccanici Imola Società Cooperativa Apparatus and method for producing plastic containers

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2606355C2 (en) * 1975-02-20 1983-07-14 Carnaud Total Interplastic, Chalon-sur-Saone Process for producing a biaxially oriented hollow body
FR2389478B1 (en) 1977-05-04 1980-11-28 Rhone Poulenc Ind
FR2399977A1 (en) * 1977-08-08 1979-03-09 Solvay PROCESS FOR THE PRODUCTION OF ORIENTATED HOLLOW BODIES
AU508942B2 (en) * 1977-12-02 1980-04-17 Yoshino Kogyosho Co., Ltd. Preparing saturated polyester resin bottles
US4151249A (en) * 1978-01-05 1979-04-24 Owens-Illinois, Inc. Method of making a blown bottle with internal ribs
JPS54133563A (en) * 1978-04-08 1979-10-17 Mitsubishi Plastics Ind Ltd Manufacturing of blown bottle
FR2459120A1 (en) * 1979-06-19 1981-01-09 Owens Illinois Inc Heat treating appts. for blow moulded articles - having a cavity defined by members differentially heatable along their length to impose different crystallinity modifications
FR2462989A1 (en) * 1979-08-07 1981-02-20 Yoshino Kogyosho Co Ltd Blow moulding bottles from saturated polyester - including maintaining the blown article against the mould for a short time to stabilise it
DE3101284C2 (en) * 1981-01-16 1985-08-01 Krupp Corpoplast Maschinenbau GmbH, 2000 Hamburg Method for shaping the open end section of a preform having a closed bottom for blow molding a hollow body made of thermoplastic material, in particular a bottle, and device for carrying out the method
DE3101283C2 (en) * 1981-01-16 1986-01-16 Krupp Corpoplast Maschinenbau GmbH, 2000 Hamburg Device for the production of preforms made of thermoplastic material for blow molding of hollow bodies
CA1197961A (en) * 1982-03-03 1985-12-17 Saleh A. Jabarin Poly(ethylene terephthalate) articles and method
US6485670B1 (en) * 1999-11-09 2002-11-26 Schmalbach-Lubeca Ag Blow molding method for producing pasteurizable containers

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2184857A1 (en) * 1972-05-16 1973-12-28 Yorkshire Imperial Plastics Thermoplastic pipe socket

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2145027A (en) * 1983-08-19 1985-03-20 Metal Box Plc Tubular articles of biaxially oriented polymers
EP2786949A3 (en) * 2008-04-18 2015-08-05 SACMI Cooperativa Meccanici Imola Società Cooperativa Apparatus and method for producing plastic containers
US9446550B2 (en) 2008-04-18 2016-09-20 Sacmi Cooperativa Meccanici Imola Societa' Cooperativa Apparatus and method for producing plastic containers
US9908277B2 (en) 2008-04-18 2018-03-06 Sacmi Cooperativa Meccanici Imola Societa' Cooperativa Apparatus and method for producing plastic containers

Also Published As

Publication number Publication date
ES443384A1 (en) 1977-05-01
DE2554281A1 (en) 1976-06-10
DK541075A (en) 1976-06-05
SE7513506L (en) 1976-06-08
SE412549B (en) 1980-03-10
JPS5182366A (en) 1976-07-19
FR2293297A1 (en) 1976-07-02
FR2293297B1 (en) 1977-07-08
NO754019L (en) 1976-06-08
IT1051015B (en) 1981-04-21

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Legal Events

Date Code Title Description
PS Patent sealed [section 19, patents act 1949]
PCNP Patent ceased through non-payment of renewal fee