GB1434719A - Heat recoverable products - Google Patents

Heat recoverable products

Info

Publication number
GB1434719A
GB1434719A GB4075172A GB4075172A GB1434719A GB 1434719 A GB1434719 A GB 1434719A GB 4075172 A GB4075172 A GB 4075172A GB 4075172 A GB4075172 A GB 4075172A GB 1434719 A GB1434719 A GB 1434719A
Authority
GB
United Kingdom
Prior art keywords
elastomeric
ethylene
article
layer
elastomer
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
GB4075172A
Other languages
English (en)
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.)
Raychem Ltd
Original Assignee
Raychem Ltd
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 Raychem Ltd filed Critical Raychem Ltd
Priority to GB4075172A priority Critical patent/GB1434719A/en
Priority to AU59856/73A priority patent/AU485441B2/en
Priority to NL7312081A priority patent/NL7312081A/xx
Priority to CA180,112A priority patent/CA998449A/en
Priority to IT28464/73A priority patent/IT993120B/it
Priority to BE135228A priority patent/BE804345A/fr
Priority to ZA736023A priority patent/ZA736023B/xx
Priority to FR7331547A priority patent/FR2197725B1/fr
Priority to BR677073A priority patent/BR7306770D0/pt
Priority to AT761073A priority patent/AT347525B/de
Priority to NO3427/73A priority patent/NO142950C/no
Priority to DE2344052A priority patent/DE2344052C2/de
Priority to IN2014/CAL/73A priority patent/IN140348B/en
Priority to ES418406A priority patent/ES418406A1/es
Publication of GB1434719A publication Critical patent/GB1434719A/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
    • B29C61/00—Shaping by liberation of internal stresses; Making preforms having internal stresses; Apparatus therefor
    • B29C61/06—Making preforms having internal stresses, e.g. plastic memory
    • B29C61/0608—Making preforms having internal stresses, e.g. plastic memory characterised by the configuration or structure of the preforms
    • B29C61/065—Preforms held in a stressed condition by means of a removable support; Supports therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B25/00—Layered products comprising a layer of natural or synthetic rubber
    • B32B25/04—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B25/08—Layered products comprising a layer of natural or synthetic rubber comprising rubber as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B1/00—Layered products having a non-planar shape
    • B32B1/08—Tubular products
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B27/00—Layered products comprising a layer of synthetic resin
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B7/00—Layered products characterised by the relation between layers; Layered products characterised by the relative orientation of features between layers, or by the relative values of a measurable parameter between layers, i.e. products comprising layers having different physical, chemical or physicochemical properties; Layered products characterised by the interconnection of layers
    • B32B7/04—Interconnection of layers
    • B32B7/12—Interconnection of layers using interposed adhesives or interposed materials with bonding properties
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
    • H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
    • H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/08—Cable junctions
    • H02G15/18—Cable junctions protected by sleeves, e.g. for communication cable
    • H02G15/1806—Heat shrinkable sleeves
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
    • H02G15/00—Cable fittings
    • H02G15/08—Cable junctions
    • H02G15/18—Cable junctions protected by sleeves, e.g. for communication cable
    • H02G15/192—Cable junctions protected by sleeves, e.g. for communication cable with support means for ends of the sleeves
    • 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
    • B29L2031/34—Electrical apparatus, e.g. sparking plugs or parts thereof
    • B29L2031/3462—Cables
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2305/00—Condition, form or state of the layers or laminate
    • B32B2305/72—Cured, e.g. vulcanised, cross-linked
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/202—Conductive
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/20—Properties of the layers or laminate having particular electrical or magnetic properties, e.g. piezoelectric
    • B32B2307/206—Insulating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00—Properties of the layers or laminate
    • B32B2307/70—Other properties
    • B32B2307/732—Dimensional properties
    • B32B2307/734—Dimensional stability
    • B32B2307/736—Shrinkable
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B32—LAYERED PRODUCTS
    • B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2457/00—Electrical equipment

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Laminated Bodies (AREA)
  • Insulating Bodies (AREA)
  • Cable Accessories (AREA)
GB4075172A 1972-09-01 1972-09-01 Heat recoverable products Expired GB1434719A (en)

Priority Applications (14)

Application Number Priority Date Filing Date Title
GB4075172A GB1434719A (en) 1972-09-01 1972-09-01 Heat recoverable products
AU59856/73A AU485441B2 (en) 1972-09-01 1973-08-30 Heat recoverable products
NL7312081A NL7312081A (fr) 1972-09-01 1973-08-31
CA180,112A CA998449A (en) 1972-09-01 1973-08-31 Heat recoverable products
IT28464/73A IT993120B (it) 1972-09-01 1973-08-31 Prodotti termo assestabili
BE135228A BE804345A (fr) 1972-09-01 1973-08-31 Produits susceptibles de reprendre leur forme a chaud
ZA736023A ZA736023B (en) 1972-09-01 1973-08-31 Heat recoverable products new olefins
FR7331547A FR2197725B1 (fr) 1972-09-01 1973-08-31
BR677073A BR7306770D0 (pt) 1972-09-01 1973-08-31 Produtos recuperaveis pelo calor
AT761073A AT347525B (de) 1972-09-01 1973-08-31 Durch waerme rueckstellbarer gegenstand
NO3427/73A NO142950C (no) 1972-09-01 1973-08-31 Varmekrympbar, sammensatt muffe for anvendelse i hoeyspent-teknikken.
DE2344052A DE2344052C2 (de) 1972-09-01 1973-08-31 Wärmerückstellfähiger, polymerer Gegenstand für die Hochspannungstechnik und dessen Verwendung zum Einschließen einer Hochspannungskomponente
IN2014/CAL/73A IN140348B (fr) 1972-09-01 1973-09-01
ES418406A ES418406A1 (es) 1972-09-01 1973-09-01 Procedimiento para la obtencion de articulos termorrecupe- rables.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB4075172A GB1434719A (en) 1972-09-01 1972-09-01 Heat recoverable products
GB1971073 1973-04-25

Publications (1)

Publication Number Publication Date
GB1434719A true GB1434719A (en) 1976-05-05

Family

ID=26254206

Family Applications (1)

Application Number Title Priority Date Filing Date
GB4075172A Expired GB1434719A (en) 1972-09-01 1972-09-01 Heat recoverable products

Country Status (10)

Country Link
AT (1) AT347525B (fr)
CA (1) CA998449A (fr)
DE (1) DE2344052C2 (fr)
ES (1) ES418406A1 (fr)
FR (1) FR2197725B1 (fr)
GB (1) GB1434719A (fr)
IN (1) IN140348B (fr)
IT (1) IT993120B (fr)
NL (1) NL7312081A (fr)
NO (1) NO142950C (fr)

Cited By (16)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2748371A1 (de) * 1976-10-29 1978-05-11 Raychem Ltd Klebstoffe
DE2937253A1 (de) * 1978-09-14 1980-03-27 Raychem Ltd Schutzhuelle fuer abgeschirmte kabelendverschluesse oder -spleissungen bzw. die verbindungsstellen zwischen abgeschirmten elektrischen kabeln und verfahren zu ihrer herstellung
US4275261A (en) * 1978-01-11 1981-06-23 Trefimetaux End piece for high voltage cables
EP0062886A2 (fr) * 1981-04-10 1982-10-20 E.I. Du Pont De Nemours And Company Feuille à structure laminée
US4390745A (en) 1978-12-01 1983-06-28 Raychem Gmbh Enclosures for electrical apparatus, cable and enclosure combinations, and kits and methods for their construction
US4403109A (en) * 1979-10-30 1983-09-06 Siemens Aktiengesellschaft Control element for high-voltage apparatus and method for the manufacture of a control element
US4431861A (en) * 1974-10-08 1984-02-14 Raychem Limited Heat recoverable article for high voltage cable terminations and splices and method for making termination and splices using same
US4681985A (en) * 1985-04-24 1987-07-21 Cable Technology Laboratories, Inc. Premolded mechanically prestressed voltage stress control cones for high voltage cables and method of fabricating same
EP0325830A2 (fr) * 1988-01-25 1989-08-02 Gencorp Inc. Procédé de liaison cohésive pour la fabrication d'un laminé d'une matière thermoplastique résistant à l'usure et d'un caoutchouc résistant aux intempéries
FR2685660A1 (fr) * 1991-12-31 1993-07-02 Atochem Procede de preparation de materiau composite forme d'un elastomere vulcanise associe a un elastomere thermoplastique a sequences polyamides et materiau composite ainsi constitue.
US5736208A (en) * 1993-06-14 1998-04-07 Raychem Gmbh Heat shrinkable article
GB2328087A (en) * 1997-06-26 1999-02-10 B & H Ltd Connection for high voltage
WO2008087151A1 (fr) * 2007-01-16 2008-07-24 Prysmian Cables Et Systemes France Dispositif de protection pour câbles d'alimentation avec isolation à base de papier imprégné
CN104870182A (zh) * 2012-12-20 2015-08-26 住友电气工业株式会社 多层热复原物品、接线和线束
CN110312618A (zh) * 2017-02-20 2019-10-08 三井化学株式会社 层叠体
EP3584075A4 (fr) * 2017-02-20 2020-12-30 Mitsui Chemicals, Inc. Stratifié

Families Citing this family (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB1530994A (en) * 1974-10-08 1978-11-01 Raychem Ltd Composite structures of heat-recoverable articles
US4212696A (en) * 1976-09-29 1980-07-15 Joslyn Mfg. And Supply Co. Method of making an organic composite electrical insulator system
JPS6016341B2 (ja) * 1977-03-16 1985-04-25 三菱樹脂株式会社 熱収縮性積層フイルム
IT1114909B (it) * 1977-07-27 1986-02-03 Fidenza Vetraria Spa Isolatore elettrico in vetroresina e materiale organico per alte tensioni e relativo procedimento di fabbricazione
FR2454205A2 (fr) * 1978-11-21 1980-11-07 Pirelli Treficable Perfectionnements aux pieces d'extremite de cables electriques pour tensions elevees en elastomeres vario-resistants
FR2414808A1 (fr) * 1978-01-11 1979-08-10 Trefimetaux Piece d'extremite de cables electriques pour tensions elevees en elastomeres vario-resistants
FR2423036A1 (fr) * 1978-04-11 1979-11-09 Silec Liaisons Elec Mastic a resistance electrique non lineaire
FR2440630A2 (fr) * 1978-10-31 1980-05-30 Mars Actel Dispositif de raccordement pour conducteurs electriques
DE2965664D1 (en) * 1978-09-04 1983-07-21 Mars Alcatel Insulated connecting device for electrical conductors
GB8410672D0 (en) * 1984-04-26 1984-05-31 Raychem Gmbh Recoverable article
DE3511299A1 (de) * 1985-03-28 1986-10-09 kabelmetal electro GmbH, 3000 Hannover Kriechstromfester schrumpfschlauch fuer endenabschluesse
JPH0829577B2 (ja) * 1987-01-26 1996-03-27 東レ・ダウコーニング・シリコーン株式会社 ポリオレフイン樹脂とシリコ−ンゴムの一体化成形体およびその製造方法
FR2875052B1 (fr) * 2004-09-08 2006-11-03 Areva T & D Sa Dispositif de haute ou moyenne tension comprenant un systeme dielectrique particulier

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL298844A (fr) * 1962-10-04 1900-01-01
US3317655A (en) * 1965-02-15 1967-05-02 Anaconda Wire & Cable Co Shrinkable stress-relief cone and method
DE1640699A1 (de) * 1967-05-27 1970-08-27 Kabel Metallwerke Ghh Endenabschluss fuer Hochspannungskabel und -leitungen
DE6609658U (de) * 1968-03-30 1972-08-03 Kabel Metallwerke Ghh Endenabschluss fuer hochspannungskabel und -leitungen.
FR1583206A (fr) * 1968-04-12 1969-10-24
FR2052085A5 (en) * 1969-07-11 1971-04-09 Union Carbide Corp Hydrated alumina as filler for organic - binders
DE2057708C3 (de) * 1970-11-17 1979-09-20 Siemens Ag, 1000 Berlin Und 8000 Muenchen Verfahren zur Herstellung eines Endverschlusses aus Gießharz

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4431861A (en) * 1974-10-08 1984-02-14 Raychem Limited Heat recoverable article for high voltage cable terminations and splices and method for making termination and splices using same
DE2748371A1 (de) * 1976-10-29 1978-05-11 Raychem Ltd Klebstoffe
US4378463A (en) 1976-10-29 1983-03-29 Raychem Limited Epihalohydrin polymer composition
US4275261A (en) * 1978-01-11 1981-06-23 Trefimetaux End piece for high voltage cables
DE2937253A1 (de) * 1978-09-14 1980-03-27 Raychem Ltd Schutzhuelle fuer abgeschirmte kabelendverschluesse oder -spleissungen bzw. die verbindungsstellen zwischen abgeschirmten elektrischen kabeln und verfahren zu ihrer herstellung
US4383131A (en) 1978-09-14 1983-05-10 Raychem Limited Shielded electrical cable joints and terminations and sleeve and method for forming same
US4390745A (en) 1978-12-01 1983-06-28 Raychem Gmbh Enclosures for electrical apparatus, cable and enclosure combinations, and kits and methods for their construction
US4403109A (en) * 1979-10-30 1983-09-06 Siemens Aktiengesellschaft Control element for high-voltage apparatus and method for the manufacture of a control element
EP0062886A3 (en) * 1981-04-10 1983-09-28 E.I. Du Pont De Nemours And Company Laminated sheet structures
EP0062886A2 (fr) * 1981-04-10 1982-10-20 E.I. Du Pont De Nemours And Company Feuille à structure laminée
US4681985A (en) * 1985-04-24 1987-07-21 Cable Technology Laboratories, Inc. Premolded mechanically prestressed voltage stress control cones for high voltage cables and method of fabricating same
EP0325830A2 (fr) * 1988-01-25 1989-08-02 Gencorp Inc. Procédé de liaison cohésive pour la fabrication d'un laminé d'une matière thermoplastique résistant à l'usure et d'un caoutchouc résistant aux intempéries
EP0325830A3 (en) * 1988-01-25 1990-12-19 Gencorp Inc. Cohesive bonding process for forming a laminate of a wear resistant thermoplastic and a weather resistant rubber
EP0550346A1 (fr) * 1991-12-31 1993-07-07 Elf Atochem S.A. Procédé de préparation de matériau composite formé d'un élastomère vulcanisé associe à un élastomère thermoplastique à séquences polyamides; et matériau composite ainsi constitué
FR2685660A1 (fr) * 1991-12-31 1993-07-02 Atochem Procede de preparation de materiau composite forme d'un elastomere vulcanise associe a un elastomere thermoplastique a sequences polyamides et materiau composite ainsi constitue.
US5624994A (en) * 1991-12-31 1997-04-29 Elf Atochem S. A. Process for the preparation of composite material formed from a vulcanized elastomer in combination with a thermoplastic elastomer containing polyamide blocks, composite material thus formed and sports articles produced with the aid of said materials
US5736208A (en) * 1993-06-14 1998-04-07 Raychem Gmbh Heat shrinkable article
GB2328087A (en) * 1997-06-26 1999-02-10 B & H Ltd Connection for high voltage
US8410366B2 (en) 2007-01-16 2013-04-02 Prysmian Cables Et Systemes France Protection device for power cables with impregnated-paper-based insulation
AU2008206985B2 (en) * 2007-01-16 2011-11-17 Prysmian Cables Et Systemes France Protection device for power cables with impregnated-paper-based insulation.
WO2008087151A1 (fr) * 2007-01-16 2008-07-24 Prysmian Cables Et Systemes France Dispositif de protection pour câbles d'alimentation avec isolation à base de papier imprégné
CN101606297B (zh) * 2007-01-16 2013-11-27 普雷斯曼电缆和系统法国公司 以浸渍纸基绝缘的电力电缆保护装置
CN104870182A (zh) * 2012-12-20 2015-08-26 住友电气工业株式会社 多层热复原物品、接线和线束
CN104870182B (zh) * 2012-12-20 2018-05-15 住友电气工业株式会社 多层热复原物品、接线和线束
CN110312618A (zh) * 2017-02-20 2019-10-08 三井化学株式会社 层叠体
EP3584075A4 (fr) * 2017-02-20 2020-12-30 Mitsui Chemicals, Inc. Stratifié
EP3584074A4 (fr) * 2017-02-20 2021-02-24 Mitsui Chemicals, Inc. Stratifié
CN110312618B (zh) * 2017-02-20 2021-09-07 三井化学株式会社 层叠体

Also Published As

Publication number Publication date
AT347525B (de) 1978-12-27
IT993120B (it) 1975-09-30
DE2344052C2 (de) 1983-06-23
CA998449A (en) 1976-10-12
ES418406A1 (es) 1976-06-01
NO142950C (no) 1980-11-19
IN140348B (fr) 1976-10-23
FR2197725A1 (fr) 1974-03-29
FR2197725B1 (fr) 1977-02-25
NL7312081A (fr) 1974-03-05
NO142950B (no) 1980-08-11
AU5985673A (en) 1975-03-06
DE2344052A1 (de) 1974-04-11
ATA761073A (de) 1978-05-15

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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
728C Application made for restoration (sect. 28/1977)
728A Order made restoring the patent (sect. 28/1977)
PCNP Patent ceased through non-payment of renewal fee

Effective date: 19920831