US3471266A - Growth of inorganic filaments - Google Patents

Growth of inorganic filaments Download PDF

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Publication number
US3471266A
US3471266A US641837A US3471266DA US3471266A US 3471266 A US3471266 A US 3471266A US 641837 A US641837 A US 641837A US 3471266D A US3471266D A US 3471266DA US 3471266 A US3471266 A US 3471266A
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US
United States
Prior art keywords
melt
growth
seed
crucible
capillary
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 - Lifetime
Application number
US641837A
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English (en)
Inventor
Harold E La Belle Jr
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.)
Saint Gobain Ceramics and Plastics Inc
Original Assignee
Tyco Laboratories Inc
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 Tyco Laboratories Inc filed Critical Tyco Laboratories Inc
Application granted granted Critical
Publication of US3471266A publication Critical patent/US3471266A/en
Assigned to INDIAN HEAD NATIONAL BANK reassignment INDIAN HEAD NATIONAL BANK SECURITY INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: SAPHIKON, INC.
Anticipated expiration legal-status Critical
Assigned to SAPHIKON, INC., A CORP. OF NEW HAMPSHIRE reassignment SAPHIKON, INC., A CORP. OF NEW HAMPSHIRE ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: TYCO LABORATORIES, INC., A CORP. OF MA.
Assigned to SAPHIKON, INC., A COMPANY OF NH reassignment SAPHIKON, INC., A COMPANY OF NH RELEASED BY SECURED PARTY (SEE DOCUMENT FOR DETAILS). Assignors: INDIAN HEAD NATIONAL BANK
Expired - Lifetime legal-status Critical Current

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    • C—CHEMISTRY; METALLURGY
    • C30—CRYSTAL GROWTH
    • C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
    • C30B15/00—Single-crystal growth by pulling from a melt, e.g. Czochralski method
    • C30B15/34—Edge-defined film-fed crystal-growth using dies or slits
    • C—CHEMISTRY; METALLURGY
    • C30—CRYSTAL GROWTH
    • C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
    • C30B15/00—Single-crystal growth by pulling from a melt, e.g. Czochralski method
    • C—CHEMISTRY; METALLURGY
    • C30—CRYSTAL GROWTH
    • C30B—SINGLE-CRYSTAL GROWTH; UNIDIRECTIONAL SOLIDIFICATION OF EUTECTIC MATERIAL OR UNIDIRECTIONAL DEMIXING OF EUTECTOID MATERIAL; REFINING BY ZONE-MELTING OF MATERIAL; PRODUCTION OF A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; SINGLE CRYSTALS OR HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; AFTER-TREATMENT OF SINGLE CRYSTALS OR A HOMOGENEOUS POLYCRYSTALLINE MATERIAL WITH DEFINED STRUCTURE; APPARATUS THEREFOR
    • C30B29/00—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape
    • C30B29/60—Single crystals or homogeneous polycrystalline material with defined structure characterised by the material or by their shape characterised by shape
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S117/00—Single-crystal, oriented-crystal, and epitaxy growth processes; non-coating apparatus therefor
    • Y10S117/90—Apparatus characterized by composition or treatment thereof, e.g. surface finish, surface coating
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S117/00—Single-crystal, oriented-crystal, and epitaxy growth processes; non-coating apparatus therefor
    • Y10S117/901—Levitation, reduced gravity, microgravity, space
    • Y10S117/902—Specified orientation, shape, crystallography, or size of seed or substrate
    • 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
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S264/00—Plastic and nonmetallic article shaping or treating: processes
    • Y10S264/19—Inorganic fiber

Definitions

  • Method of producing a continuous filament of a crystalline material comprising, providing a crucible including in its interior means substantially stationary with respect to the vertical disposition thereof defining a capillary that has an open top end and communicates at some point removed from said top end with the interior of said crucible, providing in said crucible a supply of said material, heating said material to form a melt and also to produce in said capillary principally by action of capillary rise a column of said melt above the level of the melt in the crucible, adjusting the heating of said melt so as to establish in the upper end of said capillary a zone in which single crystal growth of said material will occur onto a seed inserted in said zone, inserting a seed into said zone for a period suificient for commencement of crystal growth thereon, and pulling said seed away from said capillary at a speed corresponding to the rate at which crystal growth occurs thereon so that successive accretions of grown crystal form an extended filament.

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  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Crystallography & Structural Chemistry (AREA)
  • Materials Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
US641837A 1967-05-29 1967-05-29 Growth of inorganic filaments Expired - Lifetime US3471266A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US64183767A 1967-05-29 1967-05-29

Publications (1)

Publication Number Publication Date
US3471266A true US3471266A (en) 1969-10-07

Family

ID=24574051

Family Applications (1)

Application Number Title Priority Date Filing Date
US641837A Expired - Lifetime US3471266A (en) 1967-05-29 1967-05-29 Growth of inorganic filaments

Country Status (12)

Country Link
US (1) US3471266A (no)
BE (1) BE715819A (no)
BR (1) BR6899425D0 (no)
CH (1) CH530818A (no)
DE (1) DE1769481C3 (no)
DK (1) DK127040B (no)
ES (1) ES354476A1 (no)
FR (1) FR1581098A (no)
GB (1) GB1195947A (no)
NL (1) NL6807578A (no)
NO (1) NO123924B (no)
SE (1) SE338558B (no)

Cited By (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3650702A (en) * 1970-04-15 1972-03-21 Gen Motors Corp Crystal growth of tetragonal germanium dioxide from a flux
US3765843A (en) * 1971-07-01 1973-10-16 Tyco Laboratories Inc Growth of tubular crystalline bodies
US3998686A (en) * 1975-03-10 1976-12-21 Corning Glass Works Sapphire growth from the melt using porous alumina raw batch material
US4012213A (en) * 1973-06-14 1977-03-15 Arthur D. Little, Inc. Apparatus for forming refractory fibers
US4082423A (en) * 1976-08-19 1978-04-04 The United States Of America As Represented By The Secretary Of The Navy Fiber optics cable strengthening method and means
FR2377841A1 (fr) * 1977-01-24 1978-08-18 Mobil Tyco Solar Energy Corp Appareil et cartouche pour la croissance de cristaux a partir d'un bain de fusion
FR2377840A1 (fr) * 1977-01-24 1978-08-18 Mobil Tyco Solar Energy Corp Procede et appareil permettant de reduire les tensions residuelles des cristaux
JPS543828B1 (no) * 1970-08-28 1979-02-27
US4267010A (en) * 1980-06-16 1981-05-12 Mobil Tyco Solar Energy Corporation Guidance mechanism
US4269652A (en) * 1978-11-06 1981-05-26 Allied Chemical Corporation Method for growing crystalline materials
US5114528A (en) * 1990-08-07 1992-05-19 Wisconsin Alumni Research Foundation Edge-defined contact heater apparatus and method for floating zone crystal growth
US5126200A (en) * 1986-08-18 1992-06-30 E. I. Du Pont De Nemours And Company Laser assisted fiber growth
US5370078A (en) * 1992-12-01 1994-12-06 Wisconsin Alumni Research Foundation Method and apparatus for crystal growth with shape and segregation control
US5549971A (en) * 1986-08-18 1996-08-27 Clemson University Laser assisted fiber growth
EP0785039A2 (en) 1996-01-18 1997-07-23 General Electric Company Solidification of an article extension from a melt using a ceramic mold
US5673745A (en) * 1996-06-27 1997-10-07 General Electric Company Method for forming an article extension by melting of an alloy preform in a ceramic mold
US5673744A (en) * 1996-06-27 1997-10-07 General Electric Company Method for forming an article extension by melting of a mandrel in a ceramic mold
US5676191A (en) * 1996-06-27 1997-10-14 General Electric Company Solidification of an article extension from a melt using an integral mandrel and ceramic mold
US5743322A (en) * 1996-06-27 1998-04-28 General Electric Company Method for forming an article extension by casting using a ceramic mold
US5778960A (en) * 1995-10-02 1998-07-14 General Electric Company Method for providing an extension on an end of an article
US20020129760A1 (en) * 2001-03-14 2002-09-19 Kenji Terao Method of and apparatus for pulling up crystal
US20050227117A1 (en) * 2004-04-08 2005-10-13 Saint-Gobain Ceramics & Plastics, Inc. Single crystals and methods for fabricating same
US20070056508A1 (en) * 2003-04-23 2007-03-15 Tsuguo Fukuda Apparatus for producing fluoride crystal
US20070068376A1 (en) * 2005-06-10 2007-03-29 Saint-Gobain Ceramics & Plastics, Inc. Transparent ceramic composite
US20080075941A1 (en) * 2006-09-22 2008-03-27 Saint-Gobain Ceramics & Plastics, Inc. C-plane sapphire method and apparatus
US20080245292A1 (en) * 2007-04-09 2008-10-09 Sapphire Systems Inc. Apparatus and methods of growing void-free crystalline ceramic products
US20090130415A1 (en) * 2007-11-21 2009-05-21 Saint-Gobain Ceramics & Plastics, Inc. R-Plane Sapphire Method and Apparatus
US11047650B2 (en) 2017-09-29 2021-06-29 Saint-Gobain Ceramics & Plastics, Inc. Transparent composite having a laminated structure

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
BE791024A (fr) * 1971-11-08 1973-05-07 Tyco Laboratories Inc Procede pour developper des cristaux a partir d'un bain d'une matiere

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2809135A (en) * 1952-07-22 1957-10-08 Sylvania Electric Prod Method of forming p-n junctions in semiconductor material and apparatus therefor
US2944875A (en) * 1953-07-13 1960-07-12 Raytheon Co Crystal-growing apparatus and methods
US2977258A (en) * 1958-04-09 1961-03-28 Philco Corp Production of semiconductors and the like
US3033660A (en) * 1959-05-05 1962-05-08 Philips Corp Method and apparatus for drawing crystals from a melt
US3078151A (en) * 1958-11-17 1963-02-19 Siemens Ag Apparatus for drawing semiconductor bodies from a melt
US3212858A (en) * 1963-01-28 1965-10-19 Westinghouse Electric Corp Apparatus for producing crystalline semiconductor material

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2809135A (en) * 1952-07-22 1957-10-08 Sylvania Electric Prod Method of forming p-n junctions in semiconductor material and apparatus therefor
US2944875A (en) * 1953-07-13 1960-07-12 Raytheon Co Crystal-growing apparatus and methods
US2977258A (en) * 1958-04-09 1961-03-28 Philco Corp Production of semiconductors and the like
US3078151A (en) * 1958-11-17 1963-02-19 Siemens Ag Apparatus for drawing semiconductor bodies from a melt
US3033660A (en) * 1959-05-05 1962-05-08 Philips Corp Method and apparatus for drawing crystals from a melt
US3212858A (en) * 1963-01-28 1965-10-19 Westinghouse Electric Corp Apparatus for producing crystalline semiconductor material

Cited By (47)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3650702A (en) * 1970-04-15 1972-03-21 Gen Motors Corp Crystal growth of tetragonal germanium dioxide from a flux
JPS543828B1 (no) * 1970-08-28 1979-02-27
US3765843A (en) * 1971-07-01 1973-10-16 Tyco Laboratories Inc Growth of tubular crystalline bodies
US4012213A (en) * 1973-06-14 1977-03-15 Arthur D. Little, Inc. Apparatus for forming refractory fibers
US3998686A (en) * 1975-03-10 1976-12-21 Corning Glass Works Sapphire growth from the melt using porous alumina raw batch material
US4082423A (en) * 1976-08-19 1978-04-04 The United States Of America As Represented By The Secretary Of The Navy Fiber optics cable strengthening method and means
FR2377840A1 (fr) * 1977-01-24 1978-08-18 Mobil Tyco Solar Energy Corp Procede et appareil permettant de reduire les tensions residuelles des cristaux
FR2377841A1 (fr) * 1977-01-24 1978-08-18 Mobil Tyco Solar Energy Corp Appareil et cartouche pour la croissance de cristaux a partir d'un bain de fusion
US4269652A (en) * 1978-11-06 1981-05-26 Allied Chemical Corporation Method for growing crystalline materials
US4267010A (en) * 1980-06-16 1981-05-12 Mobil Tyco Solar Energy Corporation Guidance mechanism
US5549971A (en) * 1986-08-18 1996-08-27 Clemson University Laser assisted fiber growth
US5126200A (en) * 1986-08-18 1992-06-30 E. I. Du Pont De Nemours And Company Laser assisted fiber growth
US5114528A (en) * 1990-08-07 1992-05-19 Wisconsin Alumni Research Foundation Edge-defined contact heater apparatus and method for floating zone crystal growth
US5370078A (en) * 1992-12-01 1994-12-06 Wisconsin Alumni Research Foundation Method and apparatus for crystal growth with shape and segregation control
US5778960A (en) * 1995-10-02 1998-07-14 General Electric Company Method for providing an extension on an end of an article
EP0785039A2 (en) 1996-01-18 1997-07-23 General Electric Company Solidification of an article extension from a melt using a ceramic mold
US5904201A (en) * 1996-01-18 1999-05-18 General Electric Company Solidification of an article extension from a melt using a ceramic mold
US5673745A (en) * 1996-06-27 1997-10-07 General Electric Company Method for forming an article extension by melting of an alloy preform in a ceramic mold
US5673744A (en) * 1996-06-27 1997-10-07 General Electric Company Method for forming an article extension by melting of a mandrel in a ceramic mold
US5676191A (en) * 1996-06-27 1997-10-14 General Electric Company Solidification of an article extension from a melt using an integral mandrel and ceramic mold
US5743322A (en) * 1996-06-27 1998-04-28 General Electric Company Method for forming an article extension by casting using a ceramic mold
US20020129760A1 (en) * 2001-03-14 2002-09-19 Kenji Terao Method of and apparatus for pulling up crystal
US20110000423A1 (en) * 2003-04-23 2011-01-06 Stella Chemifa Corporation Method for producing fluoride crystal
US20070056508A1 (en) * 2003-04-23 2007-03-15 Tsuguo Fukuda Apparatus for producing fluoride crystal
US8333838B2 (en) 2003-04-23 2012-12-18 Stella Chemifa Corporation Method for producing fluoride crystal
US20050227117A1 (en) * 2004-04-08 2005-10-13 Saint-Gobain Ceramics & Plastics, Inc. Single crystals and methods for fabricating same
US20100282160A1 (en) * 2004-04-08 2010-11-11 Saint-Gobain Ceramics & Plastics, Inc. Single crystals and methods for fabricating same
US9963800B2 (en) 2004-04-08 2018-05-08 Saint-Gobain Ceramics & Plastics, Inc. Method of making a sapphire component including machining a sapphire single crystal
US9926645B2 (en) 2004-04-08 2018-03-27 Saint-Gobain Ceramics & Plastics, Inc. Method of forming a single crystal sheet using a die having a thermal gradient along its length
US8685161B2 (en) 2004-04-08 2014-04-01 Saint-Gobain Ceramics & Plastics, Inc. Method of forming a sapphire crystal using a melt fixture including thermal shields having a stepped configuration
USRE43469E1 (en) 2004-04-08 2012-06-12 Saint-Gobain Ceramics & Plastics, Inc. Single crystals and methods for fabricating same
US8157913B2 (en) 2004-04-08 2012-04-17 Saint-Gobain Ceramics & Plastics, Inc. Method of forming a sapphire single crystal
US7348076B2 (en) 2004-04-08 2008-03-25 Saint-Gobain Ceramics & Plastics, Inc. Single crystals and methods for fabricating same
US20070068375A1 (en) * 2005-06-10 2007-03-29 Saint-Gobain Ceramics & Plastics, Inc Transparent ceramic composite
US8297168B2 (en) 2005-06-10 2012-10-30 Saint-Gobain Ceramics & Plastics, Inc. Transparent ceramic composite
US20100288117A1 (en) * 2005-06-10 2010-11-18 Saint-Gobain Ceramics & Plastics Transparent Ceramic Composite
US20070068376A1 (en) * 2005-06-10 2007-03-29 Saint-Gobain Ceramics & Plastics, Inc. Transparent ceramic composite
US8025004B2 (en) 2005-06-10 2011-09-27 Saint-Gobain Ceramics & Plastics, Inc. Transparent ceramic composite
US20090308239A1 (en) * 2005-06-10 2009-12-17 Saint-Gobain Ceramics & Plastics Transparent Ceramic Composite
US7584689B2 (en) 2005-06-10 2009-09-08 Saint-Gobain Ceramics & Plastics, Inc. Transparent ceramic composite armor
US7793580B2 (en) 2005-06-10 2010-09-14 Saint-Gobain Ceramics & Plastics, Inc. Transparent ceramic composite
US8652658B2 (en) 2006-09-22 2014-02-18 Saint-Gobain Ceramics & Plastics, Inc. C-plane sapphire method and apparatus
US20080075941A1 (en) * 2006-09-22 2008-03-27 Saint-Gobain Ceramics & Plastics, Inc. C-plane sapphire method and apparatus
US7682452B2 (en) 2007-04-09 2010-03-23 Sapphire Systems Inc. Apparatus and methods of growing void-free crystalline ceramic products
US20080245292A1 (en) * 2007-04-09 2008-10-09 Sapphire Systems Inc. Apparatus and methods of growing void-free crystalline ceramic products
US20090130415A1 (en) * 2007-11-21 2009-05-21 Saint-Gobain Ceramics & Plastics, Inc. R-Plane Sapphire Method and Apparatus
US11047650B2 (en) 2017-09-29 2021-06-29 Saint-Gobain Ceramics & Plastics, Inc. Transparent composite having a laminated structure

Also Published As

Publication number Publication date
SE338558B (no) 1971-09-13
NL6807578A (no) 1968-12-02
BR6899425D0 (pt) 1973-05-10
FR1581098A (no) 1969-09-12
NO123924B (no) 1972-02-07
BE715819A (fr) 1968-11-29
DE1769481A1 (de) 1970-12-23
DE1769481B2 (de) 1973-05-17
CH530818A (de) 1972-11-30
GB1195947A (en) 1970-06-24
DK127040B (da) 1973-09-17
DE1769481C3 (de) 1974-01-03
ES354476A1 (es) 1969-11-01

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AS Assignment

Owner name: INDIAN HEAD NATIONAL BANK, NEW HAMPSHIRE

Free format text: SECURITY INTEREST;ASSIGNOR:SAPHIKON, INC.;REEL/FRAME:004637/0019

Effective date: 19860530

Owner name: INDIAN HEAD NATIONAL BANK, ONE INDIAN HEAD PLAZA,

Free format text: SECURITY INTEREST;ASSIGNOR:SAPHIKON, INC.;REEL/FRAME:004637/0019

Effective date: 19860530

AS Assignment

Owner name: SAPHIKON, INC., A CORP. OF NEW HAMPSHIRE, NEW HAMP

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST;ASSIGNOR:TYCO LABORATORIES, INC., A CORP. OF MA.;REEL/FRAME:004634/0027

Effective date: 19860530

Owner name: SAPHIKON, INC., 51 POWERS STREET, MILFORD, NEW HAM

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:TYCO LABORATORIES, INC., A CORP. OF MA.;REEL/FRAME:004634/0027

Effective date: 19860530

AS Assignment

Owner name: SAPHIKON, INC., A COMPANY OF NH,NEW HAMPSHIRE

Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:INDIAN HEAD NATIONAL BANK;REEL/FRAME:004702/0047

Effective date: 19870327

Owner name: SAPHIKON, INC., 51 POWERS STREET, MILFORD, HILLSBO

Free format text: RELEASED BY SECURED PARTY;ASSIGNOR:INDIAN HEAD NATIONAL BANK;REEL/FRAME:004702/0047

Effective date: 19870327