NL164233C - Dekzeil met randversterkingsstroken, en werkwijze voor het vervaardigen daarvan. - Google Patents

Dekzeil met randversterkingsstroken, en werkwijze voor het vervaardigen daarvan.

Info

Publication number
NL164233C
NL164233C NL7414449.A NL7414449A NL164233C NL 164233 C NL164233 C NL 164233C NL 7414449 A NL7414449 A NL 7414449A NL 164233 C NL164233 C NL 164233C
Authority
NL
Netherlands
Prior art keywords
tarpaulin
production
edge reinforcement
reinforcement strips
strips
Prior art date
Application number
NL7414449.A
Other languages
English (en)
Dutch (nl)
Other versions
NL7414449A (nl
NL164233B (nl
Original Assignee
Doerken Ewald Ag
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 Doerken Ewald Ag filed Critical Doerken Ewald Ag
Publication of NL7414449A publication Critical patent/NL7414449A/xx
Publication of NL164233B publication Critical patent/NL164233B/xx
Application granted granted Critical
Publication of NL164233C publication Critical patent/NL164233C/xx

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60J—WINDOWS, WINDSCREENS, NON-FIXED ROOFS, DOORS, OR SIMILAR DEVICES FOR VEHICLES; REMOVABLE EXTERNAL PROTECTIVE COVERINGS SPECIALLY ADAPTED FOR VEHICLES
    • B60J11/00—Removable external protective coverings specially adapted for vehicles or parts of vehicles, e.g. parking covers
    • 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
    • B29C65/022—Particular heating or welding methods not otherwise provided for
    • B29C65/028—Particular heating or welding methods not otherwise provided for making use of inherent heat, i.e. the heat for the joining comes from the moulding process of one of the parts to be joined
    • 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
    • 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
    • B29C66/435—Making large sheets by joining smaller ones or strips together
    • 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
    • B29C66/47—Joining single elements to sheets, plates or other substantially flat surfaces
    • B29C66/472—Joining single elements to sheets, plates or other substantially flat surfaces said single elements being substantially flat
    • 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
    • B29C66/47—Joining single elements to sheets, plates or other substantially flat surfaces
    • B29C66/472—Joining single elements to sheets, plates or other substantially flat surfaces said single elements being substantially flat
    • B29C66/4722—Fixing strips to surfaces other than edge faces
    • 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
    • B29C66/72—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 structure of the material of the parts to be joined
    • B29C66/729—Textile or other fibrous material made from plastics
    • B29C66/7292—Textile or other fibrous material made from plastics coated
    • 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
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types
    • B29C66/83413—Roller, cylinder or drum types cooperating rollers, cylinders or drums
    • 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
    • B29C2793/00—Shaping techniques involving a cutting or machining operation
    • B29C2793/0045—Perforating
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • 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
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • 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
    • B29C66/834—General aspects of machine operations or constructions and parts thereof characterised by the movement of the joining or pressing tools moving with the parts to be joined
    • B29C66/8341—Roller, cylinder or drum types; Band or belt types; Ball types
    • B29C66/83411—Roller, cylinder or drum types
    • B29C66/83415—Roller, cylinder or drum types the contact angle between said rollers, cylinders or drums and said parts to be joined being a non-zero angle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2007/00—Flat articles, e.g. films or sheets
    • B29L2007/005—Tarpaulins
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29L—INDEXING SCHEME ASSOCIATED WITH SUBCLASS B29C, RELATING TO PARTICULAR ARTICLES
    • B29L2031/00—Other particular articles
    • B29L2031/709—Articles shaped in a closed loop, e.g. conveyor belts
    • B29L2031/7096—Rings or ring-like articles
    • B29L2031/71—Eyelets
    • D—TEXTILES; PAPER
    • D10—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B—INDEXING SCHEME ASSOCIATED WITH SUBLASSES OF SECTION D, RELATING TO TEXTILES
    • D10B2505/00—Industrial
    • D10B2505/18—Outdoor fabrics, e.g. tents, tarpaulins
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24273—Structurally defined web or sheet [e.g., overall dimension, etc.] including aperture
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/24—Structurally defined web or sheet [e.g., overall dimension, etc.]
    • Y10T428/24777—Edge feature

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Textile Engineering (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)
  • Treatment Of Fiber Materials (AREA)
  • Curtains And Furnishings For Windows Or Doors (AREA)
  • Polishing Bodies And Polishing Tools (AREA)
  • Magnetic Record Carriers (AREA)
NL7414449.A 1973-11-09 1974-11-05 Dekzeil met randversterkingsstroken, en werkwijze voor het vervaardigen daarvan. NL164233C (nl)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE7340118U DE7340118U (de) 1973-11-09 1973-11-09 Plane mit gelochtem Verstaerkungsrand
DE2356028A DE2356028C3 (de) 1973-11-09 1973-11-09 Plane mit gelochtem Verstärkungsrand sowie Verfahren zu deren Herstellung

Publications (3)

Publication Number Publication Date
NL7414449A NL7414449A (nl) 1975-05-13
NL164233B NL164233B (nl) 1980-07-15
NL164233C true NL164233C (nl) 1980-12-15

Family

ID=37744150

Family Applications (1)

Application Number Title Priority Date Filing Date
NL7414449.A NL164233C (nl) 1973-11-09 1974-11-05 Dekzeil met randversterkingsstroken, en werkwijze voor het vervaardigen daarvan.

Country Status (23)

Country Link
US (1) US3987592A (pt)
JP (1) JPS5238159B2 (pt)
AT (1) AT339746B (pt)
BE (1) BE822063A (pt)
BR (1) BR7409377A (pt)
CA (1) CA1030038A (pt)
CH (1) CH573338A5 (pt)
CS (1) CS203973B2 (pt)
DD (1) DD114925A5 (pt)
DE (2) DE2356028C3 (pt)
DK (1) DK141990C (pt)
ES (1) ES431703A1 (pt)
FR (1) FR2250686B1 (pt)
GB (1) GB1455927A (pt)
HU (1) HU171254B (pt)
IT (1) IT1025338B (pt)
NL (1) NL164233C (pt)
NO (1) NO143264C (pt)
PL (1) PL93966B1 (pt)
RO (1) RO71708A (pt)
SE (1) SE421192B (pt)
SU (1) SU648069A3 (pt)
YU (1) YU37094B (pt)

Families Citing this family (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5233687U (pt) * 1975-08-07 1977-03-09
NL185558C (nl) * 1977-09-01 1990-05-16 Nicolon Nv Dekzeil.
US4301626A (en) * 1980-06-09 1981-11-24 Effective Conservation Systems, Inc. Inflatable heat barrier
US4628549A (en) * 1984-05-03 1986-12-16 Cantar Corporation Floatable sheet material and method of making
US4682447A (en) * 1984-08-14 1987-07-28 Mobil Oil Corporation Lightweight tarpaulin
US4642868A (en) * 1984-10-26 1987-02-17 Weathermate Marine Manufacturing, Inc. Method for punching holes in edge binding and the product produced thereby
FR2577434B1 (fr) * 1985-02-20 1987-07-03 Cefilac Procede de fabrication d'un support intercalaire de membranes semi-permeables
US4881665A (en) * 1988-03-22 1989-11-21 Mcguire Michael L Suspended flexible membrane storage silo and article dispenser
DE4143338A1 (de) * 1991-05-07 1992-11-12 Doerken Ewald Gmbh Co Kg Plane mit gelochtem randverstaerkungsstreifen
DE4114802A1 (de) * 1991-05-07 1993-02-04 Doerken Ewald Gmbh Co Kg Plane mit gelochtem randverstaerkungsstreifen
US5580635A (en) * 1995-03-06 1996-12-03 Hoheisel; Mark G. Collection tarpaulin
US5763031A (en) * 1997-01-27 1998-06-09 Huang; Jerry J. Cover reinforcement method and product thereof
US5974740A (en) * 1997-02-14 1999-11-02 Park; Peter C. Adjustable tarpaulin
DE10201480B4 (de) * 2002-01-16 2005-08-11 Mega Plast S.A., Heraklion Stretchfolie
US20060157099A1 (en) * 2005-01-19 2006-07-20 Park Peter C Adjustable strap for assembling canopy
US8439422B2 (en) * 2005-06-03 2013-05-14 Stephen G. Ricks, Jr. Tarp with multiple attachment points
DE102005028708A1 (de) * 2005-06-20 2007-01-25 Conteyor Multibag Systems N.V. Vorhang für einen Behälter
US20080120916A1 (en) * 2006-09-08 2008-05-29 Wayne-Dalton Corp. Method of creating a fabric storm cover for an opening in a building
DE102007021651A1 (de) * 2007-05-07 2008-11-13 Lang Industrieservice Gmbh Sonnenschutzfolie sowie Verfahren und Einrichtung zum Ausrüsten einer derartigen Folie
US7726710B2 (en) * 2008-01-07 2010-06-01 Midwest Canvas Corporation Cover and method of use
IT1398187B1 (it) * 2010-02-04 2013-02-14 Ruggia Telo di copertura in materiale plastico con rinforzi in tessuto polimerico.
US10077565B2 (en) 2012-06-05 2018-09-18 Primesource Building Products, Inc. Edge overlay for layered insulative blanket
US20140295133A1 (en) * 2013-04-02 2014-10-02 Poly-America, L.P. Enhanced Perimeter Polymeric Sheet
US20140355910A1 (en) * 2013-06-03 2014-12-04 Ryan Ferris Sectional Tarp
US9327754B2 (en) * 2014-09-24 2016-05-03 MC Inventors, Inc. Tarpaulin
US11612225B2 (en) * 2018-05-03 2023-03-28 Nicholas Schwartz Securing beach net
US11612823B2 (en) * 2020-05-27 2023-03-28 Frustration Free Solutions, Llc Waterslide

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US189757A (en) * 1877-04-17 Improvement in chair-seats
US1769177A (en) * 1926-10-18 1930-07-01 Conley Thomas Window screen
US2061675A (en) * 1935-03-21 1936-11-24 Nat Blank Book Co Loose leaf binding device
US2116260A (en) * 1937-06-22 1938-05-03 Corkran Herbert Grain door for railway cars
US2877876A (en) * 1957-09-12 1959-03-17 Andrew J Musselman Metallic door construction
US3332473A (en) * 1964-05-08 1967-07-25 Roy W Frederickson Screen vent structure

Also Published As

Publication number Publication date
YU37094B (en) 1984-08-31
JPS5238159B2 (pt) 1977-09-27
DD114925A5 (pt) 1975-09-05
NO143264B (no) 1980-09-29
US3987592A (en) 1976-10-26
NO143264C (no) 1981-02-11
NL7414449A (nl) 1975-05-13
SU648069A3 (ru) 1979-02-15
SE421192B (sv) 1981-12-07
CS203973B2 (en) 1981-03-31
FR2250686B1 (pt) 1981-08-07
NO743897L (pt) 1975-06-02
DK141990B (da) 1980-08-04
ES431703A1 (es) 1976-09-16
DE2356028B2 (de) 1977-08-18
AU7490674A (en) 1976-05-06
NL164233B (nl) 1980-07-15
DE2356028C3 (de) 1978-04-13
AT339746B (de) 1977-11-10
FR2250686A1 (pt) 1975-06-06
BE822063A (fr) 1975-03-03
DK141990C (da) 1980-12-22
GB1455927A (en) 1976-11-17
DK584574A (pt) 1975-06-30
DE7340118U (de) 1975-02-13
JPS5079584A (pt) 1975-06-28
PL93966B1 (pt) 1977-07-30
BR7409377A (pt) 1976-05-18
ATA795574A (de) 1977-02-15
DE2356028A1 (de) 1975-05-15
SE7412834L (pt) 1975-05-12
YU288374A (en) 1982-02-25
CA1030038A (en) 1978-04-25
RO71708A (ro) 1981-08-30
IT1025338B (it) 1978-08-10
HU171254B (hu) 1977-12-28
CH573338A5 (pt) 1976-03-15

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Legal Events

Date Code Title Description
V4 Discontinued because of reaching the maximum lifetime of a patent