USRE32169E - Thermal exchanger - Google Patents

Thermal exchanger Download PDF

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Publication number
USRE32169E
USRE32169E US06/406,999 US40699982A USRE32169E US RE32169 E USRE32169 E US RE32169E US 40699982 A US40699982 A US 40699982A US RE32169 E USRE32169 E US RE32169E
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US
United States
Prior art keywords
fluid
heating
heat exchange
heating wall
unit
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
US06/406,999
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English (en)
Inventor
Tadeusz Piotrowski
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.)
EUROBURNER A CORP OF LIECHTENSTEIN
EUROBURNER Ets
Original Assignee
EUROBURNER Ets
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 EUROBURNER Ets filed Critical EUROBURNER Ets
Assigned to EUROBURNER , A CORP. OF LIECHTENSTEIN reassignment EUROBURNER , A CORP. OF LIECHTENSTEIN ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: PIOTROWSKI, TADEUSZ
Application granted granted Critical
Publication of USRE32169E publication Critical patent/USRE32169E/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D11/00—Heat-exchange apparatus employing moving conduits
    • F28D11/02—Heat-exchange apparatus employing moving conduits the movement being rotary, e.g. performed by a drum or roller
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/58—Cooling; Heating; Diminishing heat transfer
    • F04D29/586—Cooling; Heating; Diminishing heat transfer specially adapted for liquid pumps
    • F04D29/5866—Cooling at last part of the working fluid in a heat exchanger
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D3/00—Axial-flow pumps
    • F04D3/02—Axial-flow pumps of screw type
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D19/00—Regenerative heat-exchange apparatus in which the intermediate heat-transfer medium or body is moved successively into contact with each heat-exchange medium

Definitions

  • the present invention relates to a thermal exchanger for the heating or the cooling of a fluid, especially of a liquid to be brought at a determined temperature into a circuit of use.
  • the purpose of this invention is to obviate the above mentioned drawbacks and consequently to provide a thermal exchanger for the heating or the cooling of a fluid, the sizes or which for the same power and efficiency are much smaller than those of the known devices.
  • the object of this invention which intends to reach the above purpose, consequently consists in providing a thermal exchanger for the heating or the cooling of a fluid, which is characterized by the fact that it comprises a chamber provided with heating or cooling external means; driving means to circulate in a continuous manner and at a high speed the fluid in contact with the heated or cooled surfaces of the chamber; and means for bringing the heated or cooled fluid toward an external circuit of use.
  • FIGURE illustrates the invention with a single or multiple thread screw. .Iaddend.
  • the thermal exchanger especially a heating device, comprises a boiler essentially constituted of a body 1 and a cylindrical part 2 perpendicular to said body 1, this cylindrical part being made of a good thermal conducting material and being heated by usual external means, shown here by the arrows I, for example by resistance electrical heating.
  • a drum 3 is concentrically mounted inside the cylindrical part 2 of the boiler and is driven in rotation by the shaft 4 of a motor 5, said shaft 4 corresponding to the central axis of said cylindrical part 2.
  • the external surface of the drum 3 is provided with an helicoidal spiral, this assembly forming an endless screw and the upper edge turning without contact immediately adjacent internal heating surface of the cylindrical part 2.
  • the cylindrical part 2 of the boiler is further closed by an element 7, which is used as a cover and which is provided with a central feeding tube 8 and with two parallel cylindrical walls 9 near its periphery and extending, in the use position shown on the annexed drawing, inside the drum 3, and said both cylindrical walls defining between them a chamber 9'.
  • the free end of said chamber 9' is closed and the other end joined with the cover 7 comprises two openings respectively inlet 10 and outlet 11 for a cooling fluid, for example water.
  • the boiler comprises further, at the intersection of the internal wall of the cylindrical part 2 and of the body 1, a peripheral pump 12, whereas the body 1 itself is bored with an outlet channel 13 connected to an outlet tube 14.
  • the fluid for example a heating oil, which is intended to be heated at a determined temperature for its utilization in an external circuit, is introduced in the chamber 15, limited by the internal walls 9 of the chamber 9' by means of the feeding tube 8 and according to the arrow II.
  • the oil passes then between the external wall 9 of said chamber 9' and the internal wall of the drum 3, and is then carried away by the spiral 6 of the rotating drum 3 acting in the same manner as a screw conveyor.
  • the spiral or thread 6 in used mainly to sweep away the external layer of the oil which tends to stay against the internal wall of the cylindrical part and thereby to hinder the heating of the rest of the oil due to its bad thermal conductivity.
  • the thermal exchange for the heating of the circulating oil can therefore take place in an efficacious manner and without any risk of local overheating.
  • thermometer 16 is further introduced for example in the outlet channel 13 so as to check the outlet temperature of the oil.
  • the measurement of the temperature can also be used to control in function, through an automatic adjusting device, the control circuit of the external heating I intensity.
  • thermometer 16 it is also possible to bring under control of the thermometer 16 the adjusting of the temperature and/or the output of a refrigerating fluid circulating in the chamber 9' according to the arrows IV and V.
  • thermal exchanger according to the invention described above only by way of example can be considered. It is for example possible to use as means to circulate the liquid on the heating surfaces of the boiler scraping segments or other scraping and/or stirring means located immediately adjacent said surfaces; the peripheral pump described by reference to the annexed drawing can also be replaced by any other type of pumps, suction pump, gear pump, volumetric pump, etc.
  • the main advantage of the thermal exchanger for the heating of a fluid according to the invention is its ratio of size to heating velocity and efficiency.
  • a heating power higher than 10 W/cm 2 to the device according to the invention, in an embodiment of the size 15 cm ⁇ 15 cm (driving motor not included), and with a circulating velocity of the liquid, for example a usual heating oil, of about 10 to 15 m/sec (rotational speed of the endless screw: about 3,000 turns/min); on the other hand, with a conventional device of the same size, the heating power applied could not exceed about .[.1,8.]. .Iadd.1.8 .Iaddend.W/cm 2 , except with the risk of relatively fast decomposition of the oil.
  • thermo exchanger even in the case of voluntary or not stopping of the fluid circulation in the external circuit, said fluid continues to circulate on the heating surfaces, as long as the endless screw is driven in rotation, thus eliminating any risk of decomposition of the oil by overheating.
  • a device analogous to that described in reference to the single annexed drawing can be used as a thermal exchanger for the cooling of a fluid.
  • external heating means I for example a circuit of a refrigerating fluid
  • external cooling means for example a circuit of a refrigerating fluid
  • the thermal exchanger according to the invention when used as a cooling device for a fluid presents the advantages on one hand of allowing, as in the case of the heating device, an important reduction of the size with regards to the known devices, with the same cooling power and efficiency, and on the other hand to avoid, owing to the continuous forced circulation against the cooling walls, undesired modifications of the viscosity or even a partial .[.cristallization.]. .Iadd.crystallization .Iaddend.of the fluid due to local overcooling.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
US06/406,999 1976-07-23 1982-08-10 Thermal exchanger Expired - Lifetime USRE32169E (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH944676A CH596530A5 (ar) 1976-07-23 1976-07-23
CH9446/76 1976-07-23

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
US05817034 Continuation 1977-07-19
US06/039,553 Reissue US4232733A (en) 1979-05-16 1979-05-16 Thermal exchanger

Publications (1)

Publication Number Publication Date
USRE32169E true USRE32169E (en) 1986-06-03

Family

ID=4352086

Family Applications (1)

Application Number Title Priority Date Filing Date
US06/406,999 Expired - Lifetime USRE32169E (en) 1976-07-23 1982-08-10 Thermal exchanger

Country Status (9)

Country Link
US (1) USRE32169E (ar)
JP (1) JPS5924794B2 (ar)
BE (1) BE856970A (ar)
CH (1) CH596530A5 (ar)
DE (1) DE2733197C2 (ar)
FR (1) FR2359390A1 (ar)
GB (1) GB1589722A (ar)
IT (1) IT1080635B (ar)
NL (2) NL189215C (ar)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060283203A1 (en) * 2005-06-16 2006-12-21 Kelly Patrick L Rapid fluid cooling apparatus and method
US20170072766A1 (en) * 2015-09-11 2017-03-16 Denso International America, Inc. Air conditioning system having cylindrical heat exchangers

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3126790A1 (de) * 1981-07-07 1983-01-27 Siemens Ag Kuehlkoerper zur kombinierten kuehlung von luft und einem fluessigen medium mit einem gemeinsamen kuehlmedium
JPH0623974U (ja) * 1992-07-22 1994-03-29 興亜紙工株式会社 コーンチーズ管
CN108799143A (zh) * 2018-06-29 2018-11-13 三联泵业股份有限公司 一种循环自冷潜水泵
EP4180667A1 (en) * 2021-11-15 2023-05-17 Grundfos Holding A/S Heating and/or cooling device having a pump integrated in a heat exchanger

Citations (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US756310A (en) * 1903-07-16 1904-04-05 Joseph Willmann Apparatus for heating or sterilizing liquids.
GB136651A (en) * 1918-12-19 1919-12-19 Edward Shaw Improvements in Apparatus for Evaporating or Concentrating Liquids.
DE383332C (de) * 1921-08-26 1923-10-12 Fritz Dueker Taschenkuehler
GB374941A (en) * 1931-03-18 1932-06-20 Herbert Walter Ellis Improvements in apparatus for cooling oils or other liquids
GB392350A (en) * 1931-07-07 1933-05-18 Otto Schramm Improvements in and relating to the manufacture of chocolate
US1914084A (en) * 1931-03-18 1933-06-13 Ellis Herbert Walter Apparatus for cooling oils or other fluids
FR838957A (fr) * 1937-06-18 1939-03-21 Appareil réfrigérant
US2169601A (en) * 1934-10-04 1939-08-15 Frank H Cornelius Heating system
US2372502A (en) * 1942-02-14 1945-03-27 Vapor Car Heating Co Inc Inner tube radiation with internal metallic conduction
GB586314A (en) * 1944-03-31 1947-03-14 John Graves Mckean Improvements in and relating to heat exchange apparatus
GB655157A (en) * 1946-05-18 1951-07-11 Anders Nikolaj Neergaard Improvements in or relating to machines for tempering chocolate masses
US2588277A (en) * 1946-05-18 1952-03-04 Neergaard Anders Nikolaj Conditioning machine
FR1011684A (fr) * 1949-03-03 1952-06-25 Onera (Off Nat Aerospatiale) Perfectionnements apportés aux échangeurs calorifiques par convection à circulation de fluides, notamment à ceux à circulation d'huile et d'eau
GB700205A (en) * 1950-12-08 1953-11-25 Mikrovaerk As Improvements in or relating to machines for tempering chocolate and similar masses
GB728330A (en) * 1952-06-30 1955-04-20 Baker Perkins Ltd Improvements relating to the heat treatment of flowable masses, more particularly chocolate
FR1155041A (fr) * 1955-07-20 1958-04-21 Nat Cylinder Gas Co Appareil et procédé pour le traitement, par échange de chaleur d'une matière pouvant s'écouler
DE1168930B (de) * 1962-04-12 1964-04-30 Bayer Ag Waermetauscher mit einer stehend angeordneten, hohlen Foerderschnecke
FR1384653A (fr) * 1962-10-14 1965-01-08 Procédé et dispositif pour l'évaporation de liquides dans des évaporateurs ou vaporiseurs à couche mince ou analogues, et leurs applications diverses
GB988855A (en) * 1960-05-10 1965-04-14 Crawford And Russell Inc Material treatment apparatus
GB1012017A (en) * 1964-01-21 1965-12-08 Robert Sollich Process and apparatus for tempering chocolate and similar fatty compositions particularly in coating plants
US3231474A (en) * 1962-07-16 1966-01-25 Atomic Energy Authority Uk Boiling water nuclear reactor and method of operating same
US3255084A (en) * 1963-05-17 1966-06-07 Sulzer Ag Method and apparatus for control of a nuclear power plant
US3302701A (en) * 1965-10-19 1967-02-07 David G Thomas Turbulence promoter for increased heat and mass transfer
US3354944A (en) * 1964-06-18 1967-11-28 Braun Fa B Temperature control unit for maintaining the temperature of a liquid bath at a determined magnitude
US3382917A (en) * 1965-04-09 1968-05-14 Comstock & Wescott Heating system
US3406741A (en) * 1966-11-14 1968-10-22 John M. Leach Process and apparatus for treating liquids
FR1581806A (ar) * 1968-08-08 1969-09-19
US3479689A (en) * 1966-06-15 1969-11-25 Hoechst Ag Heated godet for stretching synthetic filaments and films
US3495951A (en) * 1966-08-27 1970-02-17 Shionogi Seiyaku Kk Screw reactor
GB1204688A (en) * 1966-12-23 1970-09-09 Phillips Petroleum Co Apparatus for handling fluid materials
US3542112A (en) * 1968-06-05 1970-11-24 Artisan Ind Thin-film evaporator having multi-zone temperature control jacket
US3620684A (en) * 1966-11-18 1971-11-16 Chemithon Corp Apparatus for continuous sulfonation
US3667542A (en) * 1971-01-05 1972-06-06 Ralph C Parkes Heat transfer roll
US3690302A (en) * 1971-03-25 1972-09-12 Du Pont Rotary boilers
US3797550A (en) * 1971-08-16 1974-03-19 Monsanto Co Wiped film devolatilizer construction
US3820590A (en) * 1973-02-28 1974-06-28 B Littman On-line adaptive control of a heat exchanger
US3877515A (en) * 1969-06-17 1975-04-15 Nikolaus Laing Temperature-control system with rotary heat exchangers
US3910346A (en) * 1974-01-23 1975-10-07 Braak Bv Geb Mixer
US4058907A (en) * 1974-11-15 1977-11-22 Firma Gebr. Lodige Maschinenbau-Gesellschaft Mbh Device for the heat treatment of bulk material
US4164253A (en) * 1975-05-07 1979-08-14 Skala Stephen F Method for reducing thermal degradation of a heat exchange fluid
US4187904A (en) * 1976-11-02 1980-02-12 Hch. Bertrams Aktiengesellschaft Heat transfer installation having storage reservoir containing a salt as a heat carrier
US4200146A (en) * 1977-11-04 1980-04-29 Dynex/Rivett Inc. Method and apparatus for hydraulically driving and controlling a cooling fan

Patent Citations (42)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US756310A (en) * 1903-07-16 1904-04-05 Joseph Willmann Apparatus for heating or sterilizing liquids.
GB136651A (en) * 1918-12-19 1919-12-19 Edward Shaw Improvements in Apparatus for Evaporating or Concentrating Liquids.
DE383332C (de) * 1921-08-26 1923-10-12 Fritz Dueker Taschenkuehler
GB374941A (en) * 1931-03-18 1932-06-20 Herbert Walter Ellis Improvements in apparatus for cooling oils or other liquids
US1914084A (en) * 1931-03-18 1933-06-13 Ellis Herbert Walter Apparatus for cooling oils or other fluids
GB392350A (en) * 1931-07-07 1933-05-18 Otto Schramm Improvements in and relating to the manufacture of chocolate
US2169601A (en) * 1934-10-04 1939-08-15 Frank H Cornelius Heating system
FR838957A (fr) * 1937-06-18 1939-03-21 Appareil réfrigérant
US2372502A (en) * 1942-02-14 1945-03-27 Vapor Car Heating Co Inc Inner tube radiation with internal metallic conduction
GB586314A (en) * 1944-03-31 1947-03-14 John Graves Mckean Improvements in and relating to heat exchange apparatus
GB655157A (en) * 1946-05-18 1951-07-11 Anders Nikolaj Neergaard Improvements in or relating to machines for tempering chocolate masses
US2588277A (en) * 1946-05-18 1952-03-04 Neergaard Anders Nikolaj Conditioning machine
FR1011684A (fr) * 1949-03-03 1952-06-25 Onera (Off Nat Aerospatiale) Perfectionnements apportés aux échangeurs calorifiques par convection à circulation de fluides, notamment à ceux à circulation d'huile et d'eau
GB700205A (en) * 1950-12-08 1953-11-25 Mikrovaerk As Improvements in or relating to machines for tempering chocolate and similar masses
GB728330A (en) * 1952-06-30 1955-04-20 Baker Perkins Ltd Improvements relating to the heat treatment of flowable masses, more particularly chocolate
FR1155041A (fr) * 1955-07-20 1958-04-21 Nat Cylinder Gas Co Appareil et procédé pour le traitement, par échange de chaleur d'une matière pouvant s'écouler
GB988855A (en) * 1960-05-10 1965-04-14 Crawford And Russell Inc Material treatment apparatus
DE1168930B (de) * 1962-04-12 1964-04-30 Bayer Ag Waermetauscher mit einer stehend angeordneten, hohlen Foerderschnecke
US3231474A (en) * 1962-07-16 1966-01-25 Atomic Energy Authority Uk Boiling water nuclear reactor and method of operating same
FR1384653A (fr) * 1962-10-14 1965-01-08 Procédé et dispositif pour l'évaporation de liquides dans des évaporateurs ou vaporiseurs à couche mince ou analogues, et leurs applications diverses
US3255084A (en) * 1963-05-17 1966-06-07 Sulzer Ag Method and apparatus for control of a nuclear power plant
GB1012017A (en) * 1964-01-21 1965-12-08 Robert Sollich Process and apparatus for tempering chocolate and similar fatty compositions particularly in coating plants
US3354944A (en) * 1964-06-18 1967-11-28 Braun Fa B Temperature control unit for maintaining the temperature of a liquid bath at a determined magnitude
US3382917A (en) * 1965-04-09 1968-05-14 Comstock & Wescott Heating system
US3302701A (en) * 1965-10-19 1967-02-07 David G Thomas Turbulence promoter for increased heat and mass transfer
US3479689A (en) * 1966-06-15 1969-11-25 Hoechst Ag Heated godet for stretching synthetic filaments and films
US3495951A (en) * 1966-08-27 1970-02-17 Shionogi Seiyaku Kk Screw reactor
US3406741A (en) * 1966-11-14 1968-10-22 John M. Leach Process and apparatus for treating liquids
US3620684A (en) * 1966-11-18 1971-11-16 Chemithon Corp Apparatus for continuous sulfonation
GB1204688A (en) * 1966-12-23 1970-09-09 Phillips Petroleum Co Apparatus for handling fluid materials
US3542112A (en) * 1968-06-05 1970-11-24 Artisan Ind Thin-film evaporator having multi-zone temperature control jacket
FR1581806A (ar) * 1968-08-08 1969-09-19
US3877515A (en) * 1969-06-17 1975-04-15 Nikolaus Laing Temperature-control system with rotary heat exchangers
US3667542A (en) * 1971-01-05 1972-06-06 Ralph C Parkes Heat transfer roll
US3690302A (en) * 1971-03-25 1972-09-12 Du Pont Rotary boilers
US3797550A (en) * 1971-08-16 1974-03-19 Monsanto Co Wiped film devolatilizer construction
US3820590A (en) * 1973-02-28 1974-06-28 B Littman On-line adaptive control of a heat exchanger
US3910346A (en) * 1974-01-23 1975-10-07 Braak Bv Geb Mixer
US4058907A (en) * 1974-11-15 1977-11-22 Firma Gebr. Lodige Maschinenbau-Gesellschaft Mbh Device for the heat treatment of bulk material
US4164253A (en) * 1975-05-07 1979-08-14 Skala Stephen F Method for reducing thermal degradation of a heat exchange fluid
US4187904A (en) * 1976-11-02 1980-02-12 Hch. Bertrams Aktiengesellschaft Heat transfer installation having storage reservoir containing a salt as a heat carrier
US4200146A (en) * 1977-11-04 1980-04-29 Dynex/Rivett Inc. Method and apparatus for hydraulically driving and controlling a cooling fan

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20060283203A1 (en) * 2005-06-16 2006-12-21 Kelly Patrick L Rapid fluid cooling apparatus and method
US7810349B2 (en) 2005-06-16 2010-10-12 Patrick Laughlin Kelly Rapid fluid cooling apparatus and method
US20170072766A1 (en) * 2015-09-11 2017-03-16 Denso International America, Inc. Air conditioning system having cylindrical heat exchangers
US10086674B2 (en) * 2015-09-11 2018-10-02 Denso International America, Inc. Air conditioning system having cylindrical heat exchangers

Also Published As

Publication number Publication date
NL189215B (nl) 1992-09-01
FR2359390A1 (fr) 1978-02-17
CH596530A5 (ar) 1978-03-15
JPS5334158A (en) 1978-03-30
FR2359390B1 (ar) 1983-05-20
JPS5924794B2 (ja) 1984-06-12
NL9000003A (nl) 1990-05-01
DE2733197A1 (de) 1978-01-26
GB1589722A (en) 1981-05-20
NL189215C (nl) 1993-02-01
DE2733197C2 (de) 1986-11-13
NL7708104A (nl) 1978-01-25
IT1080635B (it) 1985-05-16
BE856970A (fr) 1978-01-20

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Legal Events

Date Code Title Description
AS Assignment

Owner name: EUROBURNER BOX 34,722 VADUZ, LIECHTENSTEIN, A CORP

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:PIOTROWSKI, TADEUSZ;REEL/FRAME:004040/0659

Effective date: 19820611