US3690935A - System for wet impact plating - Google Patents

System for wet impact plating Download PDF

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Publication number
US3690935A
US3690935A US53123A US3690935DA US3690935A US 3690935 A US3690935 A US 3690935A US 53123 A US53123 A US 53123A US 3690935D A US3690935D A US 3690935DA US 3690935 A US3690935 A US 3690935A
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Prior art keywords
barrel
water
impacting
impacting medium
storage tank
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Expired - Lifetime
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US53123A
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English (en)
Inventor
Lester Coch
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Mcgean Rohco Inc
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Waldes Kohinoor Inc
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Assigned to MCGEAN-ROHCO, INC., A CORP OF OHIO reassignment MCGEAN-ROHCO, INC., A CORP OF OHIO ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: WALDES KOHINOOR, INC., A CORP OF NY.
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    • C—CHEMISTRY; METALLURGY
    • C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
    • C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
    • C23C24/00—Coating starting from inorganic powder
    • C23C24/02—Coating starting from inorganic powder by application of pressure only
    • C23C24/04—Impact or kinetic deposition of particles
    • C23C24/045—Impact or kinetic deposition of particles by trembling using impacting inert media

Definitions

  • a venturi eductor which, together with a pump communicating with a water storage tank, is operable to rapidly transfer the impacting medium to a hopper positioned over the barrel for reuse while generating sufficient turbulence to tend to cleanse the impacting medium of spent plating material and promoter chemicals.
  • These spent materials pass, with overflow water, through an overflow strainer in the hopper to the Water storage tank where they settle and are subsequently removed. Substantially all water is thereby recovered and reused, and the frequency of impacting medium rectification is materially lessened.
  • Two separate charges of impacting medium are used in the system, and several tumbling barrel units may be supported by a single water storage tank where the water level and temperature are controlled.
  • This invention relates to wet impact plating of metal parts. More particularly, this invention relates to an improved system for wet impact plating of such parts.
  • the parts to be plated are cleansed prior to the actual plating operation.
  • Other phases of the entire operation involve the separation of the plated parts from the impacting medium.
  • the drum is specially constructed so that rotation in one direction tumbles the load, with liquid and small 3,690,935 Patented Sept. 12, 1972 particles falling through perforations in the drum. Opposite rotation discharges the parts from the drum. Water may be added for cleansing purposes and to aid in the separation. The entire drum contents passing through the perforations are collected in a pan and then transferred to the first container, or barrel, for further use.
  • cleansing and impact plating of the parts in the same solid barrel may result in unnecessary attrition of the impacting medium or in the need for substantial fresh water rinsing and ensuing effluent disposal.
  • corrosion, scale and carbon smut, etc. is often removed from the parts to be plated.
  • contact of the impacting medium with the elements while agitating the barrel during plating may adversely affect the impacting medium and/or the quality of the finished product.
  • a chute for drainage during rinsing cycles is provided. Although this chute may permit disposal of the rinsing effiuent prior to plating, the use of substantial fresh water is required for rinsing since the rinse water must be spilled or overfio-wed out of the barrel into the chute.
  • a particularly significant disadvantage of the prior proposed system involved the reuse of the impacting medium transferred to the plating barrel from the pan beneath the separating drum. Since spent plating material and promoter chemicals are present in the mass of material so transferred, and since these spent materials become present in increasing amounts during subsequent cycles, the length of time between periods of needed rectification of the impacting medium may be extremely short. Since the quantity of impacting medium utilized is generally disproportionally great in relation to the quantity of parts plated, the requirement of frequent rectification may make commercial plating operations impractical.
  • a preferred form of the invention intended to accomplish at least some of the foregoing objects comprises a system for wet impact plating of metal parts wherein a single tumbling barrel rotatable about a generally horizontal axis is utilized for independent parts cleansing, rinsing and impacting phases of the system operation.
  • a rinsing valve communicates with means defining an opening in the barrel on the axis of rotation.
  • a side opening extends longitudinally of the barrel between opposite ends, the barrel being otherwise imperforate.
  • a large, imperforate door having an access opening is selectively securable to the barrel coextensively with the side opening thereof.
  • a stationary bin is positioned beneath the barrel and supports a screen adjacent the bin top.
  • the screen is sized to retain the plated parts and to pass the impacting medium and aqueous solutions.
  • a venturi eductor communicates with the bottom of the bin in selectively operable relationship and a conduit provides communication between the venturi eductor and an overhead hopper positioned above the barrel.
  • the bottom of the overhead hopper is provided with a valve selectively operable to permit the hopper contents to fall into the barrel.
  • an overflow strainer In gravity feed communication between the top of the overhead hopper and a water storage tank is an overflow strainer, the strainer blocking passage of the impacting medium.
  • a pump is provided for pumping water from the water storage tank through the venturi eductor and to the overhead hopper from which overflow water and suspended spent materials pass to the water storage tank.
  • the metal parts to be plated are loaded into the tumbling barrel through the side opening thereof.
  • the selectively operable valve, or pet cock, of the overhead hopper is opened to permit a charge of impacting medium settled at the bottom of the overhead hopper to drop into the barrel through its side opening.
  • An amount of water in the overhead hopper usually enough to cover the charge in the hopper, is also permitted to pass into the barrel with the impacting medium.
  • the larger imperforate door is then secured in position on the barrel across its side opening.
  • Removal of the perforate door is followed by the addition of plating materials through the access opening in the larger imperforate door. Conventional promoter chemicals may also be added at this time. Afterwards the smaller imperforate door is secured in position across the access opening of the larger imperforate door.
  • the barrel is then rotated about the generally horizontal axis for a time period sufficient to impact plate the parts through the interaction of the impacting medium, the plating material and the parts. During this period, water which has been added to the barrel serves as a carrier for the plating material and as a mass lubricant whereby damage to the parts through abrasion and tangling of the parts is minimized.
  • the barrel contents are emptied onto the screen adjacent the top of the bin.
  • the screen serves to separate the plated parts from the remaining barrel contents which pass into the bin through the screen.
  • the parts may be hosed down at this time. Since the bin is generally sized to accommodate the volume of a single impacting medium charge utilized virtually all of the rinsing efliuent previously accumulated in the bin is displaced out of the bin.
  • the spent material which is carried with the overflow water into the storage tank settles out, by reason of the turbulent free condition in that tank, and may be manually cleaned from the storage tank periodically.
  • a single storage tank may support a plurality of tumbling barrel systems, with the water level in the storage tank being maintained constant through a float valve.
  • Make-up water supplied through the float valve to the storage tank may be thermostatically controlled to control the temperature of water in the system.
  • the need for frequent impacting medium rectification is further minimized through the use of two impacting medium charges.
  • One charge is present in the overhead hopper while the other remains in either the tumbling barrel or the bin.
  • the tumbling barrel Prior to transfer of the one charge from the bin to the overhead hopper, the tumbling barrel is recharged with the impacting medium maintained in the hopper.
  • FIG. 1 is a schematic illustration of an overall system for wet impact plating of metal parts according to the present invention
  • FIG. 2 is a side elevational view illustrating the relationship of a tumbling barrel, overhead hopper, and lower bin which may be utilized in the system of FIG. 1;
  • FIG. 3 is an end elevational view of the structure illustrated in FIG. 2;
  • FIG. 4 is a side elevational view of a water storage tank assembly which may be utilized in the system of FIG. 1;
  • FIG. 5 is a top plan view of the water storage tank assembly shown in FIG. 4, together with a pump utilized to draw Water from the tank assembly.
  • the system includes a tumbling barrel which is utilized for independent parts cleansing, rinsing and impacting phases of the system operation.
  • a conduit means 12 provides, through a valve means 14 (which for convenience is hereinafter termed a rinsing valve) selective communication between a source of water and the barrel 10.
  • the water source may be provided in any convenient manner and for purposes of example is illustrated as being provided by a water storage tank 16. As hereinafter more fully described, this Water storage tank 16 also serves to provide a source of water for conveying an impacting medium for reuse, and to provide a portion of a water recovery system.
  • a stationary bin assembly 18 Positioned beneath the tumbling barrel 10 is a stationary bin assembly 18; and an overhead hopper 20 is mounted above the tumbling barrel.
  • the bin assembly 18 is in selectively operable communication with a venturi eductor 22, the eductor being in communication with the hopper 20 through a suitable conduit means 24.
  • a pump 26 is provided for selectively pumping water from the water storage tank 16 through the venturi eductor 22 and to the overhead hopper 20.
  • Suitable conduit means such as those indicated at 28 and 30 provide for water flow respectively from the storage tank 16 to the pump 26 and from the pump 26 toward the venturi eductor 22.
  • a suitable valve means 32 for example a simple gate valve, is located in the conduit means 30 for the purpose of selectively controlling the supply of water through the venturi eductor.
  • the overhead hopper 20 is also in fluid communication with the water storage tank 16, through gravity flow, by a further conduit means 34.
  • the supply of water to the hopper 20 by means of the pump 26 need not be controlled to a great degree, since overflow into the storage tank 16 is permitted. As will hereinafter become apparent, an amount of such overflow is in fact desired during operation of the system.
  • the water level in the water storage tank 16 is maintained substantially constant by means of a conventional float valve means 36 located adjacent the top of the storage tank 16.
  • a suitable source of water schematically indicated at 38, supplies make-up water to the storage tank 16 through a conduit means 37 communicating with the float valve means 36 in order to maintain the water level in the storage tank substantially constant.
  • the water at the make-up source 38 may be thermostatically controlled by suitable means 39 so as to ultimately control the temperature of the water in the storage tank, and therefore in the system.
  • an overflow conduit means may be provided to place the water storage tank 16 in gravity feed relationship with a water disposal area (not shown). It Will be appreciated that the outlet from the storage tank 16 into the overflow conduit means 40 is located at a level adjacent the level of the float valve 36.
  • the tumbling barrel 10 is provided with axle and hearing assemblies 42 and 44 on opposite ends thereof. These assemblies 42 and 44 mount the tumbling barrel 10 for rotation about a generally horizontal axis indicated at 45 and are supported on suitable frame members 46 and 48 stationarily positioned on opposite sides of the barrel. Adjacent one axle and bearing assembly 44 a suitable motor means 50 may be provided for revolving the barrel 10 at selected times and at a desired adjustable rate.
  • the axle of the other barrel axle and bearing assembly 42 is hollow and provides communication between the barrel interior (through means defining a barrel end opening at 51 located on the axis 45) and the previously identified conduit means 12 in which the rinsing valve 14 is located.
  • a side opening, indicated at 52, extends longitudinally of the barrel between opposite ends, and except for that opening and the barrel end opening, the barrel 10 is otherwise imperforate.
  • the side opening 52 is sufliciently large to permit easy access to the barrel interior during loading of the metal parts to be plated.
  • a large door 54 may be selectively secured to the barrel coextensively with the side opening 52.
  • the large door 54 is itself provided with an access opening indicated at 56, the door being otherwise imperforate.
  • Suitable means 58 are provided for removably securing the large door 54 to the barrel in substantially water tight engagement.
  • the imperforate door 60 is illustrated in FIG. 2 while the perforate door 62 is shown in the schematic diagram of the overall system in FIG. 1.
  • Each of these doors 60 and 62 have overall dimensions coextensive with the access opening 56 in the large door 54.
  • suitable means 64 may be provided for releasa'bly securing the smaller doors 60 and 62 in position.
  • the barrel is substantially water tight.
  • the small perforate door is sized with a mesh sufficient to retain the metal parts and the impacting medium utilized in the process while permitting aqueous solutions to pass through the perforations in the door.
  • door arrangements thus far described function to selectively maintain a peripheral side portion of the barrel or container in a perforate or imperforate condition.
  • Other arrangements that function to do the same may be employed if desired.
  • the previously identified stationary bin assembly 18 is positioned beneath the barrel 10 between the frame members 46 and 48 supporting the barrel. Adjacent the top of the bin assembly 18, a stationary screen 66 is mounted, with the screen extending entirely across the bin assembly 18. It will become apparent that the overall extent of the bin assembly should be at least commensurate with the longitudinal extent of the side opening 52 in the barrel 10 so that the barrel contents may be unloaded into the bin assembly merely by removing the large door 54 and rotating the barrel to a position wherein the side opening 52 overlies the screen 66.
  • the screen 66 is sized with a mesh sufiicient to retain the plated parts while permitting the impacting medium and aqueous solutions to pass through. Since the bottom of the bin is sloped, as indicated at 68, when the impacting medium is to be conveyed to the overhead hopper 20 through the utilization of the venturi eductor 22, the impacting medium readily passes down the sloped bottom. Communication between the lower portion of the bin assembly 18 and the venturi eductor 22 is provided in any suitable manner as shown at 70. Water supplied through the venturi eductor 22 creates a pressure differential which tends to draw the contents of the bin along with the water to the overhead hopper 20. For a purpose hereinafter described, the bin assembly 18 is generally sized so as to be capable of holding substantially the exact volume of one charge of the impacting medium utilized in the system.
  • sufiicient turbulence is generated so as to tend to cleanse the impacting medium by removing spent plating material or promoter chemicals used in the process and which may have adhered to the particles of the impacting medium. It will be apparent to one skilled in the art that such turbulence may be created by proper sizing of the conduit means 24 to which the impacting medium is transferred with the sizing taking into account such factors as the hydrostatic head available for transfer, the transfer time, etc.
  • the hopper 20 is supported by suitable strut assemblies 74 mounted on the frame members 46 and 48 so that the petcock 72 generally centrally located over the tumbling barrel 10.
  • the tumbling barrel 10 is rotated to a position wherein is access opening 52 is directly beneath the petcock 72.
  • the previously identified water storage tank 16 is stationarily supported by suitable legs 76. Communicating with the top of the tank is the previously identified conduit means 34 which provide gravity return of overflow fluid from the hopper 20.
  • the previously identified conduit means 34 are illustrated since, in practice, a single water storage tank 16 may support several impacting medium handling units (i.e. barrel 10, overhead hopper 20 and bin assembly 18), and thus may communicate with the hoppers of each of these assemblies.
  • the previously identified pump 26 may be a high capacity, open impeller, centrifugal pump which at appropriate times, draws water from the storage tank 16 through the conduit means 28.
  • the conduit means 30 Leading from the pump is the conduit means 30 for supplying water to the venturi eductor 22.
  • two such conduit means 30 are illustrated insofar as water may be pumped to the eductors of the several impacting medium handling units supported by the single water storage tank 16.
  • the supply of water by means of the centrifugal pump 26 may be controlled in any suitable manner with a conventional line pressure valve (not shown) being preferred so that upon manual opening of the gate valve 32 in the conduit means 30 the necessary water will be supplied to the eductor 22.
  • the condition of the water in the storage tank 16 is generally turbulent free so that the microscopic particles separated from the impacting medium and carried into the tank from the overhead hopper 20 tend to settle out. Periodically, these materials may be manually cleaned from the tank. It is readily apparent that access to the 8 water storage tank 16 for this purpose may be had through the provision of any suitable door or the like.
  • the system of the present invention provides for water recovery and reuse, thereby minimizing water expenditure. That water which is supplied to the tumbling barrel through the conduit means 12 and which is lost as subsequently described, is minimal and is replenished through the make-up water conduit means 37 extending from the make-up water source 38.
  • the term impacting medium is well known in the art so that a detailed description thereof is not deemed necessary.
  • the impacting medium is comprised of a matrix material consisting of a mass of discrete solid granules, which may be metallic, ceramic, etc. and which may have various shapes, e.g. spherical or irregular. These materials are usually a great deal smaller than the articles to be plated but larger than the plating material added at a later phase of the cycle.
  • the large door 54 is secured in position coextensively with the side opening 52 of the barrel. This door 54 remains in that position until the end of the process cycle.
  • the smaller imperforate door 60 which had been secured to the larger door during a previous portion of the cycle, is then removed.
  • Cleansing chemicals which together with water in the barrel form a cleansing solution, are then added to the barrel 10 through the access opening 56 in the large door 54. These cleansing chemicals are conventionally employed in impact plating systems and need not be described in detail.
  • the small imperforate door 60 is then secured again in position and the barrel is rotated about its generally horizontal axis for a time period sufficient to cleanse the parts. During this time the cleansing chemicals will also affect the cleanings of particles, if
  • the imperforate door is replaced by the perforate door 62.
  • the tumbling barrel 10 is again rotated.
  • the parts and the impacting medium are retained in the barrel 10 by the perforate door 62 while the rinsing effiuent passes through that door.
  • the perforate door 62 is removed.
  • a metal plating powder such as zinc, cadmium, tin or other metal or alloy is added to the barrel 10 along with a conventional plating agent or promoter chemical.
  • the small imperforate door 60 is then secured in position and the barrel is rotated for a time period necessary to plate the parts.
  • Water is also added to the barrel 10 during the plating phase of the cycle. This water serves as a carrier for the plating material and as a mass lubricant so as to minimize the possibility of damage to the parts through abrasion and tangling of the parts.
  • the parts and remaining barrel contents which now need to be separated are dumped out of the plating barrel 10 and into the stationary bin assembly 18.
  • the screen 66 at the top of the bin separates the plated parts from the mass of impacting medium and spent plating material and promoter chemicals which pass therethrough. At this time the parts may be hosed down to hydraulically assist in separation.
  • the bin Since the bin is generally sized to accommodate the volume of a single charge of impacting medium normally utilized, the rinsing effluent previously accumulated in the bin is displaced through overflow and is disposed of. Thus the materials removed during the cleansing operation are separated from the impacting medium. If desired, the rinsing effluent may be earlier drained out of the bin through suitable means (not shown).
  • water from the pump 26 serves to hydraulically transfer the bin contents to the overhead hopper 20. During this time cleansing of spent plating materials and promoter chemicals is accomplished through the turbulence generated as previously discussed.
  • Overflow Water drained out of the overhead hopper 20 through the conduit means 34 carries with it the suspended spent plating material and promoter chemicals to the water storage tank 16.
  • the overflow strainer 70 permits this material to pass through while retaining the impacting medium which settles to the hopper bottom.
  • This time interval is further lengthed through the utilization of two impacting medium charges in each tumbling barrel assembly.
  • the previously transferred charge Prior to transfer of the impacting medium charge to the overhead hopper 20, the previously transferred charge is placed into the barrel 10.
  • one impacting medium charge is present in the overhead hopper while the other remains in either the tumbling barrel 10 or at a later time in the bin assembly 18.
  • a process for cleansing, rinsing and wet impact plating metal parts within the same container the container being mounted for at least rotating movement about a generally horizontal axis and being provided with a side peripheral portion that is selectively maintained in a perforate or imperforate condition, the process comprising:
  • a process according to claim 1 further utilizing a stationary bin having screen means positioned adjacent the top thereof, said screen being sized to retain the metal parts while passing the impacting medium and aqueous solutions, said process further including the steps of:
  • a process according to claim 2 including the steps of:
  • a process for wet impact plating of metal parts the process utilizing (a) a tumbling barrel rotatable about a generally horizontal axis, the barrel defining an end opening, located on that axis, communicating with a rinsing valve, and defining a side opening extending longitudinally of the barrel between opposite ends, the barrel being otherwise imperforate, (b) a larger imperforate door having an access opening and selectively securable to the barrel coextensively with the side opening thereof, (c) a smaller perforate door and a smaller imperforate door each selectively securable to the first imperforate door coextensively with said access opening thereof, the perforate door being sized to retain the metal parts and impacting medium utilized in the process and to permit aqueous solutions to pass, the smaller imperforate door, together with the first imperforate door when secured thereto, entirely blocking the side opening of the barrel, (d) a stationary bin positioned beneath the barrel, and including a screen adjacent the top
  • a process for cleansing, rinsing and wet impact plating of metal parts in the same container the container being mounted for at least rotating movement and being provided with closure means for selectively maintaining a peripheral portion of the container in a perforate or 3 imperforate condition, the process comprising:
  • a process according to claim 9 including, after emptying the container contents, the step of:
  • the container with a second impacting medium, plating material, parts to be plated, and a liquid carrier for the plating material, the second impacting medium being provided from the first station, prior to transfer of the first mentioned impacting medium thereto.
  • a process according to claim 9 wherein said step of rotating the container with the peripheral portion maintained in a perforate condition comprises the step of rotating the container about a generally horizontal axis.
  • a process according to claim 9 further utilizing a stationary bin having screen means positioned adjacent the top thereof, and wherein the step of separating the parts from the remaining container contents comprises the steps of:
  • a process according to claim 13 further utilizing a stationary bin having screen means positioned adjacent the top thereof, and wherein the step of separating the parts from the remaining container contents comprises the steps of:

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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Chemically Coating (AREA)
  • Cleaning And De-Greasing Of Metallic Materials By Chemical Methods (AREA)
  • Cleaning By Liquid Or Steam (AREA)
  • Electroplating Methods And Accessories (AREA)
US53123A 1970-07-08 1970-07-08 System for wet impact plating Expired - Lifetime US3690935A (en)

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US5312370A 1970-07-08 1970-07-08

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US3690935A true US3690935A (en) 1972-09-12

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US53123A Expired - Lifetime US3690935A (en) 1970-07-08 1970-07-08 System for wet impact plating

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US (1) US3690935A (enrdf_load_stackoverflow)
BE (1) BE812720A (enrdf_load_stackoverflow)
CA (1) CA932521A (enrdf_load_stackoverflow)
DE (1) DE2117170B2 (enrdf_load_stackoverflow)
FR (1) FR2097741A5 (enrdf_load_stackoverflow)
GB (1) GB1300194A (enrdf_load_stackoverflow)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4062990A (en) * 1976-06-10 1977-12-13 Waldes Kohinoor, Inc. Non-polluting system for metal surface treatments
US4654230A (en) * 1984-10-12 1987-03-31 Tru-Plate Process, Inc. Method of impact plating selective metal powders onto metallic articles
US20100221574A1 (en) * 2009-02-27 2010-09-02 Rochester Thomas H Zinc alloy mechanically deposited coatings and methods of making the same

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115976505B (zh) * 2022-11-25 2024-08-30 科腾环保科技(嘉兴)股份有限公司 一种机械镀设备

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2640002A (en) * 1951-04-17 1953-05-26 Tainton Company Cladding metal
US3132043A (en) * 1963-03-25 1964-05-05 Peen Plate Inc Metal plating
US3531315A (en) * 1967-07-17 1970-09-29 Minnesota Mining & Mfg Mechanical plating

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4062990A (en) * 1976-06-10 1977-12-13 Waldes Kohinoor, Inc. Non-polluting system for metal surface treatments
US4162680A (en) * 1976-06-10 1979-07-31 Waldes Kohinoor, Inc. Non-polluting system for metal surface treatments
US4654230A (en) * 1984-10-12 1987-03-31 Tru-Plate Process, Inc. Method of impact plating selective metal powders onto metallic articles
US20100221574A1 (en) * 2009-02-27 2010-09-02 Rochester Thomas H Zinc alloy mechanically deposited coatings and methods of making the same

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Publication number Publication date
DE2117170C3 (enrdf_load_stackoverflow) 1975-04-03
CA932521A (en) 1973-08-28
GB1300194A (en) 1972-12-20
DE2117170B2 (de) 1974-08-08
FR2097741A5 (enrdf_load_stackoverflow) 1972-03-03
BE812720A (fr) 1974-09-23
DE2117170A1 (de) 1972-01-13

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Owner name: MCGEAN-ROHCO, INC., 1250 TERMINAL TOWER, CLEVELAND

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNOR:WALDES KOHINOOR, INC., A CORP OF NY.;REEL/FRAME:004447/0237

Effective date: 19850806