US3742670A - Protector for high temperature furnace insulation supports - Google Patents

Protector for high temperature furnace insulation supports Download PDF

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Publication number
US3742670A
US3742670A US00173939A US3742670DA US3742670A US 3742670 A US3742670 A US 3742670A US 00173939 A US00173939 A US 00173939A US 3742670D A US3742670D A US 3742670DA US 3742670 A US3742670 A US 3742670A
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United States
Prior art keywords
high temperature
refractory
stud
fastening means
construction according
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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
US00173939A
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English (en)
Inventor
C Byrd
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.)
Stemcor Corp
Original Assignee
Carborundum Co
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 Carborundum Co filed Critical Carborundum Co
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Publication of US3742670A publication Critical patent/US3742670A/en
Assigned to KENNECOTT CORPORATION reassignment KENNECOTT CORPORATION MERGER (SEE DOCUMENT FOR DETAILS). EFFECTIVE DEC. 31, 1980 NORTH DAKOTA Assignors: BEAR CREEK MINING COMPANY, BEAR TOOTH MINING COMPANY, CARBORUNDUM COMPANY THE, CHASE BRASS & COPPER CO. INCORPORATED, KENNECOTT EXPLORATION, INC., KENNECOTT REFINING CORPORATION, KENNECOTT SALES CORPORATION, OZARK LEAD COMPANY, PLAMBEAU MINING CORPORATION, RIDGE MINING CORPORATION (ALL MERGED INTO)
Assigned to STEMCOR CORPORATION, 200 PUBLIC SQUARE, CLEVELAND, OHIO 44114 A DE. CORP. reassignment STEMCOR CORPORATION, 200 PUBLIC SQUARE, CLEVELAND, OHIO 44114 A DE. CORP. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: KENNECOTT MINING CORPORATION
Assigned to KENNECOTT MINING CORPORATION reassignment KENNECOTT MINING CORPORATION CHANGE OF NAME (SEE DOCUMENT FOR DETAILS). EFFECTIVE DEC. 31, 1986. (SEE DOCUMENT FOR DETAILS) Assignors: KENNECOTT CORPORATION
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02K—JET-PROPULSION PLANTS
    • F02K1/00—Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto
    • F02K1/78—Other construction of jet pipes
    • F02K1/82—Jet pipe walls, e.g. liners
    • F02K1/822—Heat insulating structures or liners, cooling arrangements, e.g. post combustion liners; Infrared radiation suppressors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02K—JET-PROPULSION PLANTS
    • F02K1/00—Plants characterised by the form or arrangement of the jet pipe or nozzle; Jet pipes or nozzles peculiar thereto
    • F02K1/78—Other construction of jet pipes
    • F02K1/80—Couplings or connections
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
    • F16L—PIPES; JOINTS OR FITTINGS FOR PIPES; SUPPORTS FOR PIPES, CABLES OR PROTECTIVE TUBING; MEANS FOR THERMAL INSULATION IN GENERAL
    • F16L59/00—Thermal insulation in general
    • F16L59/12—Arrangements for supporting insulation from the wall or body insulated, e.g. by means of spacers between pipe and heat-insulating material; Arrangements specially adapted for supporting insulated bodies
    • 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T50/00—Aeronautics or air transport
    • Y02T50/60—Efficient propulsion technologies, e.g. for aircraft

Definitions

  • PROTECTOR FOR HIGH TEMPERATURE FURNACE INSULATION SUPPORTS [75] Inventor: Carlisle 0. Byrd, Jr., Houston, Tex.
  • ABSTRACT An insulating construction system for high temperature applications comprising a structural supporting member in refractory insulating bodies arranged to protect the supporting member at the points where it is exposed to high temperatures.
  • the refractory insulating body acts to increase the useful life of the supporting member and allows greater latitude in the choice of materials for the member, resulting in greater ease of construction and increased efficiency of operation during the use of the member in high temperature applications.
  • the invention is particularly concerned with practical and effective means of uniting and securing non or weak structural insulations, such as bodies of refractory fiber, and of high thermal tolerances with structural or supporting members such as steel or other appropriate metal plates or sheets, and so forth, to provide composite sections of integrated insulation and supporting or carrying structure, providing complete units suitable by themselves for use as walls, ceilings or panel components for furnaces and the like foregoing high temperature chambers.
  • Conventional high temperature installations such as furnaces, soaking pits, stress relieving units, annealing furnaces, and so forth, are constructed with walls and- /or tops of refractory brick or block, such as insulating firebrick, normally braced or even supported with metal structures, and of compositions which typically range in densities of from about 25 lbs/cu ft for maximum exposure temperatures of approximately 1600F up to about 65 lbs/cu ft for a maximum exposure temperature of approximately 3000F.
  • refractory brick or block such as insulating firebrick, normally braced or even supported with metal structures
  • the use of dense refractories, such as bricks or block structures, is often required in high temperature equipment where the refractory is subjected to abrasion or comes in contact with fused materials, such as molten glasses or metals.
  • fused materials such as molten glasses or metals.
  • Many applications, however, are for furnace interiors in which only hot gases are in contact with the refractory liner, in these cases lining materials of lower density and mechanical strength are suitable and have the advantages of reduced weight and greater ease of installation.
  • the invention therefor comprises a construction method for the installation of this type of furnace lining system and, more specifically, a fastening method for the attachment of the linings to furnace walls and roofs.
  • the fastening devices sometimes fail prematurely because of inadequate protection against high temperatures. This causes extensive furnace downtime for repairs.
  • the invention therefor provides means for protecting the insulation fastening devices, these means being easily installed and retaining their effectiveness for extended periods of furnace operation.
  • This invention comprises a high temperature insulation construction for direct exposure to high temperature environments comprising a structural supporting member, a body of insulating material superimposed over the structural supporting member, said body of insulating material being secured to the structural supporting member by means of a plurality of spaced apart studs of metallic composition passing through the body of insulating material with the first end of the stud secured to the structural supporting member and the second end extending through and protruding from the surface of the body of insulating material, the stud having shoulder means for holding the body of insulating material and, a refractory protector applied around said shoulder means and stud end for protection during exposure to high temperatures.
  • FIG. 1 is a sectional view of a portion of a furnace wall and lining, showing one method of fastening the lining.
  • FIG. 2 is an end view of the fastening nut, washer and refractory protector.
  • FIG. 3 is a sectional view similar to that of FIG. 1, showing an alternate type of fastener protector.
  • FIG. 4 is a view of the contact surface of the refractory protector of FIG. 3.
  • FIG. 5 is a sectional view similar to that of FIG. 1, showing a second modification of the lining fastener.
  • FIG. 6 shows the washer fastener as used in FIG. 5.
  • FIG. 7 shows a third modification of the lining fastener stud.
  • FIG. I A portion of a furnace wall, having an insulating lining and lining fastener, is shown in FIG. I.
  • the furnace shell 10 has a stud l2 fastened to it by welding or other suitable means.
  • the stud projects into the furnace interior and is made long enough to penetrate the layer of insulating lining 20, 22 and permit the attachment of the appropriate fastening means.
  • the end of the stud is threaded to cooperatively engage with the threads of a holding nut 16. This holding nut is tightened against a large washer 18.
  • the stud 12, holding nut 16 and washer 18 may be made of carbon or alloy steel, depending on the degree of temperature at which the furnace will operate. Special alloy steels are more resistant to high temperatures but are expensive.
  • the refractory protector 24 This is a cup-like refractory shape which may be formed by pressing or vacuum casting a composition comprising suitable refractory fibers such as aluminum silicate with appropriate binders and firing the resulting shape to give a strong refractory protector body 24.
  • a hole is formed in the center of the refractory protector 24 which allows it to fit upon stud 12, followed by the metal washer 18 and holding nut 16.
  • the refractory protector 24 is of sufficient strength to transfer the compressing force of holding nut 16 to the lining materials 20 and 22 and insure their firm support.
  • the lining shown in FIG. 1 comprises a layer of mineral wool 20, covered by a layer comprising aluminum silicate fibers 22.
  • the lining fastener assemblies of the invention are not limited to these specific types of fibers, however, but may be employed with any type of fibrous heat resistant material, either fabricated as felts or blankets, or in more rigid compositions such as insulating boards, panels or blocks.
  • FIG. 2 An end view of the refractory protector 24, washer 18 and holding nut 16 is shown in FIG. 2.
  • the refractory protector cap is filled with a cast or refractory mixture 28 sufficient to completely fill the cap and cover the washer 18, holding nut 16 and the end of the stud 12. If the stud protrudes too far, it is cut off before the refractory mixture is applied.
  • Any suitable castable refractory may be used, provided its coefficient of expansion is such that it will not rupture the protector body 24 when the assembly is brought up to furnace temperature. Since these temperatures may range up to about 2500F to 3000F, the refractory protector cup and castable refractory mixture must be stable to the upper limit of this temperature range.
  • FIG. 3 An alternate means for stud fastener protection is shown in FIG. 3.
  • This consists of a cap 30 molded or otherwise formed from an appropriate refractory comprising fibers such as aluminum silicate or similar heat resistant fibers or filaments and suitable filler or binder's. Molded or otherwise secured within the cap 30 is a holding nut 32. This may be either a threaded nut or a similar threaded member suitable for firm attachment within the cap 30, the threads of the nut or member cooperating with threads 14 on stud 12.
  • the cap 30 contains an internal cavity 34 to give clearance space for the end of stud 12 when the cap 30 is tightened against insulation body 22.
  • a protruding rim 36 is formed adjacent to the outer periphery of cap 30, this functions as a sealing aid.
  • cap 30 The inner surface of cap 30 is shown in FIG. 4, showing the hexagonal shape given to the periphery 38 of the cap to facilitate the tightening operation.
  • This type of holding device has the advantage of rapid installation with the elimination of the step where castable refractory mix is required for filling in the refractory protector and covering the holding nut and washer. Installation is facilitated, especially for work in confined places or for furnace roof installations where the use of castable mix is difficult.
  • a modification of the fastening stud is shown in'FIG. in which the stud is not threaded but has one or more radial slots 42 cut near its outer extremity.
  • the retaining washer 44 has a center keyhole opening 46 (see FIG. 6) which permits washer 44 to fit over the end of stud 12 and snap into one of the radial slots 42, thus holding the refractory protector 24 and the lining insulation and 22 in place.
  • the protruding end of stud 12 is then cut off and the exposed stud end and the washer 44 is then covered by a second refractory protector 48.
  • Both refractory protectors 24 and 48 are made from the same type of refractory composition, the protector 48 being shaped for a force fit when inserted within the inner periphery of refractory protector 24.
  • FIG. 7 an alternate form of stud construction is shown, in which the stud has several holes 52 drilled or otherwise formed near the end of the stud.
  • the refractory protector 24 and washer 44 are assembled as.
  • the fastening methods as provided by this invention provide a means of protecting the metal parts of the fastening system against high furnace temperatures, thereby prolonging a useful life of the fasteners and permitting extended furnace operation.
  • the refractory protectors used increase the area of support from each stud so that fewer studs are needed. Furnace heat losses are reduced since there is less heat transfer through the metal studs to the furnace walls. In many applications, the refractory protectors of the invention will permit the use of less expensive fastening materials, thus reducing the cost of furnace construction and maintenance during operation.
  • a high temperature insulation construction for direct exposure to high temperature environments comprising: (a) a structural supporting member, (b) a body of insulating material superimposed over the structural supporting member, (0) said body of insulating material being secured to the structural supporting member by means of a plurality of spaced apart studs of metallic composition passing through the body of insulating material with the first end of the stud secured to the structural supporting member and the second end extending through and protruding from the surface of the body of insulating material, the studs having fastening means for holding the body of insulating material, and (d) a separate refractory protector comprising a cup-like fired refractory shape formed to encircle the second end of the stud and partially enclose the fastening means.
  • both refractory members are formed from a mixture comprising aluminum silicate fibers.

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Furnace Housings, Linings, Walls, And Ceilings (AREA)
US00173939A 1971-08-23 1971-08-23 Protector for high temperature furnace insulation supports Expired - Lifetime US3742670A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US17393971A 1971-08-23 1971-08-23

Publications (1)

Publication Number Publication Date
US3742670A true US3742670A (en) 1973-07-03

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Application Number Title Priority Date Filing Date
US00173939A Expired - Lifetime US3742670A (en) 1971-08-23 1971-08-23 Protector for high temperature furnace insulation supports

Country Status (6)

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US (1) US3742670A (enrdf_load_stackoverflow)
JP (1) JPS5624188B2 (enrdf_load_stackoverflow)
AU (1) AU465631B2 (enrdf_load_stackoverflow)
CA (1) CA974369A (enrdf_load_stackoverflow)
DE (1) DE2241164A1 (enrdf_load_stackoverflow)
GB (1) GB1396134A (enrdf_load_stackoverflow)

Cited By (25)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3945165A (en) * 1973-06-26 1976-03-23 Commissariat A L'energie Atomique Heat-insulating system for a fast reactor shield slab
US3979866A (en) * 1973-10-23 1976-09-14 Nuclear Power Co. (Whetstone) Limited Nuclear reactors
US3981117A (en) * 1974-05-07 1976-09-21 Trelleborgs Gummifabrik Aktiebolag Lining and fastener arrangement for devices having surfaces subject to wear
US4010939A (en) * 1974-12-26 1977-03-08 Midland-Ross Corporation Melting pot apparatus for use in a continuous casting process
US4018023A (en) * 1974-03-06 1977-04-19 The Carborundum Company Ceramic elements and insulation assembly including such elements
US4030261A (en) * 1975-04-08 1977-06-21 The Babcock & Wilcox Company Ceramic cap for insulation anchor
US4056904A (en) * 1976-06-10 1977-11-08 National Gypsum Company Wallboard application method and apparatus therefor
US4156792A (en) * 1977-09-14 1979-05-29 Bickley Furnaces Incorporated Electric furnace construction
US4157001A (en) * 1977-01-15 1979-06-05 The Carborundum Company Furnace linings
US4189301A (en) * 1977-05-06 1980-02-19 Urquhart Engineering Company, Limited Reinforced insulating members
US4321415A (en) * 1980-08-18 1982-03-23 Abar Corporation Heating element support for vacuum electric furnaces
DE3241593A1 (de) * 1981-11-12 1983-05-19 General Signal Corp., 06904 Stamford, Conn. Feuerfeste auskleidung mit aus fasermaterial bestehenden elementen und verfahren zu ihrer herstellung
US4418679A (en) * 1980-06-05 1983-12-06 Grayson Roy N Ceramic wall spacer kit
US4432289A (en) * 1981-07-23 1984-02-21 Deumite Norman Furnace brick tie back assembly
US4584814A (en) * 1984-02-21 1986-04-29 Manville Corporation Method and apparatus for fastening an insulation module to a surface
US4633636A (en) * 1985-01-22 1987-01-06 Alexander William E Retainer assembly
US4730452A (en) * 1985-08-26 1988-03-15 Asea Stal Ab Power plant with a combustion chamber with combustion in a fluidized bed
US4803822A (en) * 1987-01-30 1989-02-14 Stemcor Corporation Modular furnace lining and hardware system therefor
US4848055A (en) * 1988-05-09 1989-07-18 A. P. Green Industries, Inc. Center mounted insulating module for a furnace
US4850171A (en) * 1987-01-30 1989-07-25 Stemcor Corporation Modular furnace lining and hardware system therefor
US4885890A (en) * 1987-01-30 1989-12-12 Stemcor Corporation Modular furnace lining and hardware system therefor
US6434902B1 (en) * 2000-10-10 2002-08-20 Gregory A. Westra Poured concrete wall insulation
US20040011943A1 (en) * 2000-09-22 2004-01-22 Long Sr Robert T. Connector assembly for insulated concrete walls
US20130323036A1 (en) * 2012-06-04 2013-12-05 Alstom Technology Ltd. Heat shield for a low-pressure turbine steam inlet duct
US10962286B2 (en) 2018-08-31 2021-03-30 Harbisonwalker International, Inc. Mounting hardware for refractory module

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS52117635U (enrdf_load_stackoverflow) * 1976-03-04 1977-09-06
JPS5310439U (enrdf_load_stackoverflow) * 1976-07-09 1978-01-28
JPS5363305A (en) * 1976-11-17 1978-06-06 Daikin Ind Ltd Separation of aqueous substance from mixture of compound havingperfluoroalkyl group
JPS53125361U (enrdf_load_stackoverflow) * 1977-03-16 1978-10-05
FR2406779A1 (fr) * 1977-10-22 1979-05-18 Mckechnie Refractory Fibres Isolation thermique
FR2597572A1 (fr) * 1986-04-18 1987-10-23 Garcia Garrido Lorenzo Isolement thermique demontable pour canalisations, vannes et equipements divers
US5941237A (en) * 1996-01-19 1999-08-24 Heat-N-Glo Fireplace Products, Inc. Universal non-porous fiber reinforced combustion chamber fireplace
DE102012001897A1 (de) * 2012-02-01 2013-08-01 Eisenmann Ag Mehrschaliges Wandmodul für ein Gehäuse und Vorrichtung zum Temperieren von Gegenständen

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2341777A (en) * 1942-04-13 1944-02-15 Universal Oil Prod Co Insulating block

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5111807B2 (enrdf_load_stackoverflow) * 1971-08-06 1976-04-14

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2341777A (en) * 1942-04-13 1944-02-15 Universal Oil Prod Co Insulating block

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
Dictionary of Ceramics by Dodd 1967 by George Newnes Limited. *

Cited By (27)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3945165A (en) * 1973-06-26 1976-03-23 Commissariat A L'energie Atomique Heat-insulating system for a fast reactor shield slab
US3979866A (en) * 1973-10-23 1976-09-14 Nuclear Power Co. (Whetstone) Limited Nuclear reactors
US4018023A (en) * 1974-03-06 1977-04-19 The Carborundum Company Ceramic elements and insulation assembly including such elements
US3981117A (en) * 1974-05-07 1976-09-21 Trelleborgs Gummifabrik Aktiebolag Lining and fastener arrangement for devices having surfaces subject to wear
US4010939A (en) * 1974-12-26 1977-03-08 Midland-Ross Corporation Melting pot apparatus for use in a continuous casting process
US4030261A (en) * 1975-04-08 1977-06-21 The Babcock & Wilcox Company Ceramic cap for insulation anchor
US4056904A (en) * 1976-06-10 1977-11-08 National Gypsum Company Wallboard application method and apparatus therefor
US4157001A (en) * 1977-01-15 1979-06-05 The Carborundum Company Furnace linings
US4189301A (en) * 1977-05-06 1980-02-19 Urquhart Engineering Company, Limited Reinforced insulating members
US4156792A (en) * 1977-09-14 1979-05-29 Bickley Furnaces Incorporated Electric furnace construction
US4418679A (en) * 1980-06-05 1983-12-06 Grayson Roy N Ceramic wall spacer kit
US4321415A (en) * 1980-08-18 1982-03-23 Abar Corporation Heating element support for vacuum electric furnaces
US4432289A (en) * 1981-07-23 1984-02-21 Deumite Norman Furnace brick tie back assembly
DE3241593A1 (de) * 1981-11-12 1983-05-19 General Signal Corp., 06904 Stamford, Conn. Feuerfeste auskleidung mit aus fasermaterial bestehenden elementen und verfahren zu ihrer herstellung
US4584814A (en) * 1984-02-21 1986-04-29 Manville Corporation Method and apparatus for fastening an insulation module to a surface
US4633636A (en) * 1985-01-22 1987-01-06 Alexander William E Retainer assembly
US4730452A (en) * 1985-08-26 1988-03-15 Asea Stal Ab Power plant with a combustion chamber with combustion in a fluidized bed
US4850171A (en) * 1987-01-30 1989-07-25 Stemcor Corporation Modular furnace lining and hardware system therefor
US4803822A (en) * 1987-01-30 1989-02-14 Stemcor Corporation Modular furnace lining and hardware system therefor
US4885890A (en) * 1987-01-30 1989-12-12 Stemcor Corporation Modular furnace lining and hardware system therefor
US4848055A (en) * 1988-05-09 1989-07-18 A. P. Green Industries, Inc. Center mounted insulating module for a furnace
US20040011943A1 (en) * 2000-09-22 2004-01-22 Long Sr Robert T. Connector assembly for insulated concrete walls
US6945506B2 (en) * 2000-09-22 2005-09-20 Composite Technologies Corporation Connector assembly for insulated concrete walls
US6434902B1 (en) * 2000-10-10 2002-08-20 Gregory A. Westra Poured concrete wall insulation
US20130323036A1 (en) * 2012-06-04 2013-12-05 Alstom Technology Ltd. Heat shield for a low-pressure turbine steam inlet duct
US10221723B2 (en) * 2012-06-04 2019-03-05 General Electric Technology Gmbh Heat shield for a low-pressure turbine steam inlet duct
US10962286B2 (en) 2018-08-31 2021-03-30 Harbisonwalker International, Inc. Mounting hardware for refractory module

Also Published As

Publication number Publication date
AU4577472A (en) 1974-02-28
DE2241164A1 (de) 1973-03-01
JPS4830611A (enrdf_load_stackoverflow) 1973-04-23
JPS5624188B2 (enrdf_load_stackoverflow) 1981-06-04
CA974369A (en) 1975-09-16
AU465631B2 (en) 1975-10-02
GB1396134A (en) 1975-06-04

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AS Assignment

Owner name: KENNECOTT CORPORATION

Free format text: MERGER;ASSIGNORS:BEAR CREEK MINING COMPANY;BEAR TOOTH MINING COMPANY;CARBORUNDUM COMPANY THE;AND OTHERS;REEL/FRAME:003961/0672

Effective date: 19801230

AS Assignment

Owner name: KENNECOTT MINING CORPORATION

Free format text: CHANGE OF NAME;ASSIGNOR:KENNECOTT CORPORATION;REEL/FRAME:004815/0036

Effective date: 19870220

Owner name: STEMCOR CORPORATION, 200 PUBLIC SQUARE, CLEVELAND,

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:KENNECOTT MINING CORPORATION;REEL/FRAME:004815/0091

Effective date: 19870320