US3247004A - Method and apparatus for coating stators - Google Patents

Method and apparatus for coating stators Download PDF

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Publication number
US3247004A
US3247004A US205265A US20526562A US3247004A US 3247004 A US3247004 A US 3247004A US 205265 A US205265 A US 205265A US 20526562 A US20526562 A US 20526562A US 3247004 A US3247004 A US 3247004A
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US
United States
Prior art keywords
stator
particles
coating
internal
heat
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
US205265A
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English (en)
Inventor
Dale M Dosser
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.)
Micafil Inc
3M Co
Original Assignee
Minnesota Mining and Manufacturing 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 Minnesota Mining and Manufacturing Co filed Critical Minnesota Mining and Manufacturing Co
Priority to US205265A priority Critical patent/US3247004A/en
Priority to DE19631463985 priority patent/DE1463985B2/de
Priority to JP3283463A priority patent/JPS4120010B1/ja
Priority to JP4305366A priority patent/JPS431321B1/ja
Application granted granted Critical
Publication of US3247004A publication Critical patent/US3247004A/en
Anticipated expiration legal-status Critical
Assigned to MICAFIL, INC. reassignment MICAFIL, INC. ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: POSSIS CORPORATION
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02K—DYNAMO-ELECTRIC MACHINES
    • H02K15/00—Processes or apparatus specially adapted for manufacturing, assembling, maintaining or repairing of dynamo-electric machines
    • H02K15/12—Impregnating, moulding insulation, heating or drying of windings, stators, rotors or machines

Definitions

  • the invention relates to coating techniques and particularly to improved apparatus and methods for coating apparatus components with .an insulating layer of resin.
  • the invention provides a method for coating selected surfaces of apparatus components, particularly electric motor stators, with insulation without the necessity for specially masking those surfaces of the component desirably not coated.
  • the invention provides a mass production technique for appropriately coating stators or the like with a minimum of procedural steps.
  • the coating of apparatus components such as stators with resin insulating coatings has necessarily involved preliminary masking of parts of the component which must remain uncoated or essentially free of any significant thickness of coating.
  • the surface of the internal bore of stators as well as the surface of the outer periphery of stators generally must remain unchanged during the step of coating the slots and outer laminations with insulating material.
  • After appropriate masking of a stator it may be coated in limited areas by using prior art techniques such as dipping the partially masked stator in a liquid bath of coating resin or in a fluidized bed of particles of fusible resin material.
  • the stator itself must, of course, be elevated in temperature appropriately to cause pick-up of fusible resin particles while the stator is immersed in the fluidized bed.
  • FIGURE 1 is a perspective view of one embodiment of my coating apparatus
  • FIGURES 2, 3 and 4 are partial perspective views of alternative embodiments of my coating apparatus.
  • FIGURE 5 is a perspective view of an expandable mandrel such as employed in the arrangement of elements illustratedin FIGURE 4.
  • FIGURE 1 my coating apparatus is contained within a chamber it having an exit duct 11 for air and excess powder removal.
  • a stator 12 to be coated is supported within chamber by means of, as illustrated in FIGURE 1, two rotatable rollers 13 and 14. One or both of these rollers is rotated by means of a suitable power source such as motor 15. Rotation of stator 12 is simply accomplished by friction engagement of the outer periphery of the stator against rollers 13 and 14.
  • suitable rotation of it for coating may be accomplished by using an expandable mandrel support 16 as illustrated in FIGURES Patented Apr. 19, 1966 4 and 5, or by means of a small support roller placed within the space of internal bore of the stator (not illustrated in the drawings).
  • At least one pair of oppositely disposed spray nozzles 17 and 18 which are fed with powdered heat-fusible insulating material through conduits 19 and 20 from any suitable source (not shown). Particles of heat-fusible material are blown fromthese spray nozzles under pressure during coating. It is of utmost importance that at least one pair of spray nozzles for the coating operation be oppositely disposed, such that powder particles emerging from one nozzle of the pair is met by the stream of powder particles emerging from the other or opposite nozzle of the pair.
  • the pair of nozzles are so disposed in relation to a stator to be coated (or, stated another way, in relation to the support means for a stator tobe coated) such that the slots 21 of a rotating stator to be coated move in sequence past the pair of nozzles and are each subjected in sequence to the spray from each nozzle of the pair. Because of this relationship turbulence of powdered heat-fusible material is created within each slot of the stator as the coating operation progresses.
  • the pre-heat temperature employed will not be suflicient tocause the heat-fusible material to degrade or decompose sufficiently to no longer function for its intended purpose.
  • the pre-heat temperature employed will be insufiicient to destroy the electrical insulation qualities of coating material applied to the stator.
  • FIGURE 2 For small stators are being coated, it is desirable to insure more positive removal of excess sprayed powder from the internal bore of the stator. This may be done (see FIGURE 2) by using a vacuum head 26 connected through duct 27 to avacuum or exhaust fan source (not shown). Another suitable modification of apparatus to accomplish this result is illustrated in FIGURE 3. As there illustrated, an air nozzle 28 is used to blow excess sprayed particles, as they emerge from slots 21, from the internal bore of the stator.
  • flared spray nozzles 29 and 30 may be used in the spray operation, as illustrated in FIGURE 4. Also,
  • an expandable mandrel 16 suitably of a silicone or other rubbery covering capable of being expanded by injecting air under pressure therewithin or by screwing an expandable mechanism therewithin by means of handle 31.
  • the air flow approximately transverse to the axis of rotation of a stator serves to remove particles of heatfusible coating material rapidly from the locus of coating so as to essentially prevent any thickness of coating material from accumulating upon the internal diameter and outer diameter or periphery of the stator.
  • a slight coating of material on the internal and outer diameter of a stator is usually permissible so long as the thickness of it is insignificant, say below one mil; thus such thin coatings are negligible and the part is considered essentially free of coating in such areas.
  • Suitable heat-fusible powdery material for using in coating as here discussed may be selected from thermoplastic as well as thermosetting classes of organic resins. Indeed, where insulation is not a primary requirement, materials other than those of organic character may be used. Of course, some heat-fusible inorganic or ceramictype materials may indeed possess satisfactory insulating character.
  • a preferred type of heat-fusible and yet thermosettable resin powder for use in forming insulating coatings comprises epoxy resin.
  • Wear US. Patent No. 2,847,395 contains several formulations of epoxy resinhardener mixtures, with and without latent heat-activatable accelerators for the reaction between epoxy resin and a hardener reactive therewith; an'dthe disclosure of that Wear patent is here incorporated by reference.
  • pre-heat temperatures for the part may be as high as 400 F., or even higher, but below the temperature of substantial degradation of the resin mixture.
  • the technique of coating here described causes substantially uniform deposition of material on the surfaces of slots. In achieving this result, it is preferable to spray powdery material at substantially the same velocity from each nozzle of the pair, so as to create turbulence in the slot and thereby cause particles of coating material to strike the internal surfaces of the slot and adhere and coalesce thereupon.
  • the part to be coated may be rotated through the opposing spray sources one or more times. Usually one complete revolution will be sufficient to build up a coating thickness (e.g., 5 to 15 mils) satisfactory for insulating slots of a stator.
  • a coating thickness e.g., 5 to 15 mils
  • a hexagonal stator may be coated using support means suuh as illustrated in FIGURES 4 and 5.
  • Stators having skewed or angular slots, or slots located on their outer periphery may also be coated using, for example, such support means as illustrated in FIGURES 4 and 5.
  • Objects presenting coating problems substantially similar or equivalent to those discussed in the coating of stators may also wisely be coated in an automatic manner using the principles hereof.
  • a method for providing an insulating coating on parts of a stator, specifically on the internal surfaces of slots and on the external surface of outer laminations while maintaining the internal diameter and outer diameter of said stator substantially free of said insulating coating comprising (1) mounting said stator on a rotatable support, (2) rotating the supported stator on its axis while said stator is at a temperature sufficiently high to effect fusion of particles of heat-fusible insulating material which may be deposited thereupon, (3) depositing particles of heat-fusible insulating material upon the internal surfaces of slots and on the external surface of outer laminations of said stator by directing said particles toward said surfaces from opposing spray sources located adjacent the outer laminations of said rotating stator in a manner such that opposing flow of said particles is effected from said spray sources through each slot of said stator in sequence during rotation of said stator, said opposing flow of said particles within each slot of said stator being such as to create turbulence therewithin and thereby effect deposition of said particles upon the internal surfaces of each stat
  • Apparatus for coating stators comprising (1) meansto support a stator for rotation, (2) opposing spray n0z-- zles spaced from each other sufficiently to accommodatesaid stator therebetween and adapted to spray materiali from opposite directions into slots of said stator sequentially during rotation of the same, (3) means to create an air flow transverse to the axis of rotation of said stator rotated by said first means and (4) means to force air into the internal bore of said stator.
  • the apparatus of claim 3 where the means to holdand rotate the stator comprises at least two support rollers: spaced apart, with at least one connected to means to ro-- tate the same.
  • the apparatus of claim 3 where the means to hold and rotate the stator comprises at least one support roller adapted to be inserted within the internal bore of a stator.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Power Engineering (AREA)
  • Manufacture Of Motors, Generators (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Electrostatic Spraying Apparatus (AREA)
  • Moulding By Coating Moulds (AREA)
US205265A 1962-06-26 1962-06-26 Method and apparatus for coating stators Expired - Lifetime US3247004A (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
US205265A US3247004A (en) 1962-06-26 1962-06-26 Method and apparatus for coating stators
DE19631463985 DE1463985B2 (de) 1962-06-26 1963-06-19 Verfahren zum anbringen eines isolierenden ueberzuges auf zu isolierende teile des stators einer elektrischen maschine
JP3283463A JPS4120010B1 (cs) 1962-06-26 1963-06-25
JP4305366A JPS431321B1 (cs) 1962-06-26 1963-06-25

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US205265A US3247004A (en) 1962-06-26 1962-06-26 Method and apparatus for coating stators

Publications (1)

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US3247004A true US3247004A (en) 1966-04-19

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US205265A Expired - Lifetime US3247004A (en) 1962-06-26 1962-06-26 Method and apparatus for coating stators

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US (1) US3247004A (cs)
JP (2) JPS4120010B1 (cs)
DE (1) DE1463985B2 (cs)

Cited By (34)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3311085A (en) * 1965-05-10 1967-03-28 Millard F Smith Apparatus for coating objects
US3344772A (en) * 1963-04-01 1967-10-03 Possis Machine Corp Spray coater
US3355309A (en) * 1963-07-15 1967-11-28 Gen Electric Method and apparatus for applying coatings onto articles of manufacture
US3355310A (en) * 1963-07-15 1967-11-28 Gen Electric Method of forming layers of insulating material in slots of magnetic cores
US3367789A (en) * 1964-10-21 1968-02-06 Possis Machine Corp Method for mounting and masking a workpiece
US3377984A (en) * 1963-03-25 1968-04-16 Possis Machine Corp Airflow mandrel
US3431887A (en) * 1963-11-13 1969-03-11 Polymer Corp Apparatus for coating articles in a fluidized bed
US3465714A (en) * 1964-10-21 1969-09-09 Possis Machine Corp Coating machine with improved work holder
US3470010A (en) * 1963-02-01 1969-09-30 Erik Frede Christiansen Method for applying streams of insulating particles to stator and rotor winding slots
US3498260A (en) * 1963-07-15 1970-03-03 Gen Electric Machine for applying coatings onto articles of manufacture
US3537875A (en) * 1968-03-04 1970-11-03 Gen Electric Method and apparatus for applying insulating material onto articles of manufacture
US3617327A (en) * 1966-12-29 1971-11-02 Johns Manville Method and apparatus for applying a coating material
US3797456A (en) * 1970-03-05 1974-03-19 Nordson Corp Apparatus for coating the interiors of hollow bodies
US3889015A (en) * 1972-05-24 1975-06-10 Electrostatic Equip Corp Coating method with cleaning
US3896760A (en) * 1972-12-13 1975-07-29 Usm Corp Apparatus for making self-locking internally threaded articles
US3939020A (en) * 1969-09-18 1976-02-17 John A. Caramanian Method of balancing a rotor
US3989859A (en) * 1974-11-14 1976-11-02 Koerper Engineering Associates, Inc. Coating entire surface of three-dimensional article with heat fusible plastic
US4025664A (en) * 1974-01-02 1977-05-24 Eppco Container coating method
US4150164A (en) * 1974-01-02 1979-04-17 W. R. Grace & Co. Process for heating cylindrical containers with a plasma arc generated flame
US4293785A (en) * 1978-09-05 1981-10-06 Jackson Research, Inc. Rotating electric machines with enhanced radiation cooling
WO1994009183A1 (en) * 1992-10-13 1994-04-28 Reliance Electric Industrial Company Apparatus and method for coating an electromagnetic coil
US5316801A (en) * 1992-11-25 1994-05-31 General Electric Company Electrostatic powder coating method for insulating the series loop connections of a dynamoelectric machine
US5384339A (en) * 1993-03-09 1995-01-24 Starkey; Donn R. Epoxy based balancing compound and method for balancing a rotor utilizing an ultraviolet-curable epoxy resin composition
US5456940A (en) * 1994-03-28 1995-10-10 Minimed Inc. System for lubricating a syringe barrel
US6126748A (en) * 1998-06-25 2000-10-03 Reliance Electric Technologies, Llc Stator core resin remover
US6136374A (en) * 1999-10-14 2000-10-24 Reuscher; Craig J. Method and apparatus for coating vented brake rotors
US6365013B1 (en) * 1997-11-03 2002-04-02 Siemens Aktiengesellschaft Coating method and device
US6407472B1 (en) * 1997-05-19 2002-06-18 Minebea Co., Ltd. Motor structure and their manufacturing method
WO2009087694A1 (en) * 2008-01-08 2009-07-16 Freni Brembo S.P.A. Method and apparatus for coating the ventilation chamber of rotors for disc brakes with a protective layer
US20090209162A1 (en) * 2008-02-20 2009-08-20 Orion Energy Systems, Inc. Method and apparatus for mounting a light sleeve
US20110139066A1 (en) * 2009-12-10 2011-06-16 Cheng-Hsin Chuang Pneumatic nozzle for roller coating
US8460760B2 (en) 2010-11-30 2013-06-11 United Technologies Corporation Coating a perforated surface
US20230216382A1 (en) * 2022-01-03 2023-07-06 Ford Motor Company Varnish applicator for electric motor
US20230216383A1 (en) * 2022-01-03 2023-07-06 Ford Motor Company Varnish applicator for electric motor

Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1763611A (en) * 1929-02-09 1930-06-10 Goodyear Tire & Rubber Tire-lining apparatus
US2188901A (en) * 1938-02-09 1940-02-06 Columbus Coated Fabrics Corp Method of making waterproof cloth
US2324787A (en) * 1940-01-22 1943-07-20 E B & A C Whiting Company Method of and apparatus for dusting fibrous material
US2421975A (en) * 1943-03-19 1947-06-10 Roscoe D Williams Manufacture of fluorescent tubing
US2597021A (en) * 1950-03-24 1952-05-20 Edward O Norris Centrifugal spray coating apparatus
US2613635A (en) * 1949-01-24 1952-10-14 Eclipse Air Brush Co Apparatus for spraying rotating radial surfaces
US2763575A (en) * 1953-11-17 1956-09-18 James A Bede Method of spray painting
US2995482A (en) * 1958-05-27 1961-08-08 Westinghouse Electric Corp Method for applying sealing material to sealing surfaces
DE1127257B (de) * 1958-10-04 1962-04-05 Mannesmann Ag Verfahren zur Herstellung von Schutzueberzuegen auf metallischen Koerpern, z.B. Rohren, durch Aufbringen pulverfoermiger Epoxyharze
US3108022A (en) * 1960-05-09 1963-10-22 Polymer Processes Inc Apparatus for coating an elongate body with fluidized coating material
US3111642A (en) * 1960-06-07 1963-11-19 Int Resistance Co Electrical resistor
US3155545A (en) * 1961-02-27 1964-11-03 Rheem Mfg Co Apparatus for external coating of objects

Patent Citations (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1763611A (en) * 1929-02-09 1930-06-10 Goodyear Tire & Rubber Tire-lining apparatus
US2188901A (en) * 1938-02-09 1940-02-06 Columbus Coated Fabrics Corp Method of making waterproof cloth
US2324787A (en) * 1940-01-22 1943-07-20 E B & A C Whiting Company Method of and apparatus for dusting fibrous material
US2421975A (en) * 1943-03-19 1947-06-10 Roscoe D Williams Manufacture of fluorescent tubing
US2613635A (en) * 1949-01-24 1952-10-14 Eclipse Air Brush Co Apparatus for spraying rotating radial surfaces
US2597021A (en) * 1950-03-24 1952-05-20 Edward O Norris Centrifugal spray coating apparatus
US2763575A (en) * 1953-11-17 1956-09-18 James A Bede Method of spray painting
US2995482A (en) * 1958-05-27 1961-08-08 Westinghouse Electric Corp Method for applying sealing material to sealing surfaces
DE1127257B (de) * 1958-10-04 1962-04-05 Mannesmann Ag Verfahren zur Herstellung von Schutzueberzuegen auf metallischen Koerpern, z.B. Rohren, durch Aufbringen pulverfoermiger Epoxyharze
US3108022A (en) * 1960-05-09 1963-10-22 Polymer Processes Inc Apparatus for coating an elongate body with fluidized coating material
US3111642A (en) * 1960-06-07 1963-11-19 Int Resistance Co Electrical resistor
US3155545A (en) * 1961-02-27 1964-11-03 Rheem Mfg Co Apparatus for external coating of objects

Cited By (44)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3470010A (en) * 1963-02-01 1969-09-30 Erik Frede Christiansen Method for applying streams of insulating particles to stator and rotor winding slots
US3377984A (en) * 1963-03-25 1968-04-16 Possis Machine Corp Airflow mandrel
US3344772A (en) * 1963-04-01 1967-10-03 Possis Machine Corp Spray coater
US3498260A (en) * 1963-07-15 1970-03-03 Gen Electric Machine for applying coatings onto articles of manufacture
US3355310A (en) * 1963-07-15 1967-11-28 Gen Electric Method of forming layers of insulating material in slots of magnetic cores
US3355309A (en) * 1963-07-15 1967-11-28 Gen Electric Method and apparatus for applying coatings onto articles of manufacture
US3431887A (en) * 1963-11-13 1969-03-11 Polymer Corp Apparatus for coating articles in a fluidized bed
US3367789A (en) * 1964-10-21 1968-02-06 Possis Machine Corp Method for mounting and masking a workpiece
US3465714A (en) * 1964-10-21 1969-09-09 Possis Machine Corp Coating machine with improved work holder
US3311085A (en) * 1965-05-10 1967-03-28 Millard F Smith Apparatus for coating objects
US3617327A (en) * 1966-12-29 1971-11-02 Johns Manville Method and apparatus for applying a coating material
US3537875A (en) * 1968-03-04 1970-11-03 Gen Electric Method and apparatus for applying insulating material onto articles of manufacture
US3939020A (en) * 1969-09-18 1976-02-17 John A. Caramanian Method of balancing a rotor
US3797456A (en) * 1970-03-05 1974-03-19 Nordson Corp Apparatus for coating the interiors of hollow bodies
US3889015A (en) * 1972-05-24 1975-06-10 Electrostatic Equip Corp Coating method with cleaning
US3896760A (en) * 1972-12-13 1975-07-29 Usm Corp Apparatus for making self-locking internally threaded articles
US4025664A (en) * 1974-01-02 1977-05-24 Eppco Container coating method
US4150164A (en) * 1974-01-02 1979-04-17 W. R. Grace & Co. Process for heating cylindrical containers with a plasma arc generated flame
US3989859A (en) * 1974-11-14 1976-11-02 Koerper Engineering Associates, Inc. Coating entire surface of three-dimensional article with heat fusible plastic
US4293785A (en) * 1978-09-05 1981-10-06 Jackson Research, Inc. Rotating electric machines with enhanced radiation cooling
WO1994009183A1 (en) * 1992-10-13 1994-04-28 Reliance Electric Industrial Company Apparatus and method for coating an electromagnetic coil
US5474799A (en) * 1992-10-13 1995-12-12 Reliance Electric Industrial Company Apparatus and method for coating an electromagnetic coil
US5685910A (en) * 1992-10-13 1997-11-11 Reliance Electric Industrial Company Apparatus for coating an electromagnetic coil
US5316801A (en) * 1992-11-25 1994-05-31 General Electric Company Electrostatic powder coating method for insulating the series loop connections of a dynamoelectric machine
US5384339A (en) * 1993-03-09 1995-01-24 Starkey; Donn R. Epoxy based balancing compound and method for balancing a rotor utilizing an ultraviolet-curable epoxy resin composition
US5516813A (en) * 1993-03-09 1996-05-14 Starkey; Donn R. Epoxy based ultraviolet light curable balancing epoxy composition
US5456940A (en) * 1994-03-28 1995-10-10 Minimed Inc. System for lubricating a syringe barrel
US6407472B1 (en) * 1997-05-19 2002-06-18 Minebea Co., Ltd. Motor structure and their manufacturing method
US6365013B1 (en) * 1997-11-03 2002-04-02 Siemens Aktiengesellschaft Coating method and device
US6126748A (en) * 1998-06-25 2000-10-03 Reliance Electric Technologies, Llc Stator core resin remover
US6129952A (en) * 1998-06-25 2000-10-10 Reliance Electric Technologies, Llc Stator core resin remover and method
US6436189B1 (en) * 1999-10-14 2002-08-20 Craig J. Reuscher Method and apparatus for coating vented brake rotors
GB2358362A (en) * 1999-10-14 2001-07-25 Craig Reuscher Coating vented brake rotors
US6136374A (en) * 1999-10-14 2000-10-24 Reuscher; Craig J. Method and apparatus for coating vented brake rotors
GB2358362B (en) * 1999-10-14 2003-06-11 Craig Reuscher Method and apparatus for coating vented brake rotors
WO2009087694A1 (en) * 2008-01-08 2009-07-16 Freni Brembo S.P.A. Method and apparatus for coating the ventilation chamber of rotors for disc brakes with a protective layer
US20090209162A1 (en) * 2008-02-20 2009-08-20 Orion Energy Systems, Inc. Method and apparatus for mounting a light sleeve
US7762861B2 (en) 2008-02-20 2010-07-27 Orion Energy Systems, Inc. Method and apparatus for mounting a light sleeve
US20110139066A1 (en) * 2009-12-10 2011-06-16 Cheng-Hsin Chuang Pneumatic nozzle for roller coating
US8312833B2 (en) * 2009-12-10 2012-11-20 Southern Taiwan University Of Technology Pneumatic nozzle for roller coating
US8460760B2 (en) 2010-11-30 2013-06-11 United Technologies Corporation Coating a perforated surface
US20230216382A1 (en) * 2022-01-03 2023-07-06 Ford Motor Company Varnish applicator for electric motor
US20230216383A1 (en) * 2022-01-03 2023-07-06 Ford Motor Company Varnish applicator for electric motor
US11799368B2 (en) * 2022-01-03 2023-10-24 Ford Motor Company Varnish applicator for electric motor

Also Published As

Publication number Publication date
DE1463985B2 (de) 1972-07-06
DE1463985A1 (de) 1969-04-10
JPS4120010B1 (cs) 1966-11-21
JPS431321B1 (cs) 1968-01-18

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AS Assignment

Owner name: MICAFIL, INC., 825 RHODE ISLAND AVENUE, GOLDEN VAL

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:POSSIS CORPORATION;REEL/FRAME:004499/0933

Effective date: 19850731