US2792806A - Apparatus for plating the interior of hollow objects - Google Patents

Apparatus for plating the interior of hollow objects Download PDF

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US2792806A
US2792806A US411842A US41184253A US2792806A US 2792806 A US2792806 A US 2792806A US 411842 A US411842 A US 411842A US 41184253 A US41184253 A US 41184253A US 2792806 A US2792806 A US 2792806A
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plating
hollow
tube
gas
interior
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US411842A
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Pawlyk Peter
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Commonwealth Engineering Company of Ohio
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Commonwealth Engineering Company of Ohio
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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
    • C23C16/00—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes
    • C23C16/04—Coating on selected surface areas, e.g. using masks
    • C23C16/045—Coating cavities or hollow spaces, e.g. interior of tubes; Infiltration of porous substrates

Definitions

  • This invention relates to apparatus and methods for the coating of metallic bases with metallic coats deposited from the vapor state by the thermal decomposition of metal-bearing gases. More particularly the invention relates to the uniform coating of the interior of hollow objects of tubular structure such as gun barrels and cylindrical bearing surfaces.
  • a primary object of the present invention is to'provide improved apparatus whereby the interior plating of hollow objects may be uniformly achieved.
  • An important object of the present invention is to provide equipment for the plating of hollow objects on a mass production basis.
  • a principal object of the invention is to provide an improved apparatus for the interior plating of hollow objects.
  • the invention comprises a gas plating system in which the object to be plated itself forms walls of the plating chamber, and which object is rotated about a slotted tube adapted to bear the volatilized metal-bearing compound to the object.
  • the system include means for the mounting of the hollow object about the slotted tube for the rotation of the object, means to direct the ow of the plating gases uniformly to the interiorrwalls of the object, and means to provide for the uniformity of plating gas ow through the system.
  • the invention also includes the feature of ready interchangeability of plating objects which facilitates the use of mass production methods in the gas plating of hollow objects.
  • Substantially all materials which decompose under the inuence of heat are operable in thej process of invention, the compounds containing chomium and nickel, e. g. nickel carbonyl being most suitable.
  • Figure 1 is a schematic representation of one embodiment of the apparatus of invention
  • Figure 2 is an enlarged sectional view of the object to be plated including means illustrating the mounting thereof;
  • Figure 3 is a View of the left hand end of the structure shown in Figure 2;
  • Figure 4 is a view in section of a modification of the slotted tube of Figure 2;
  • Figure 5 is an end view of the structure of Figure 4.
  • Figure 6 illustrates a modified form of the invention particularly adapted for the plating of long hollow objects
  • Figure 7 is a view of a portion of the structure of Figure 6;
  • Figure 8 illustrates a method of mounting a hollow object to secure plating of the entire interior surface.
  • the apparatus is shown to comprise the following general components: a source A of inert carrier gas; a substantially constant temperature source B of metal-bearing gas; a'plating chamber systemv ice C; a recovery system D; and a vacuum pump system E for controlling plating gas ow.
  • Source A may comprise a conventional cylinder 1 containing carbon dioxide 2 under pressure.
  • the cylinder is provided with a valve 3 for the control of gaseous carbon dioxide flow therefrom and a gauge 4 for indicating the flow rate.
  • the source B of metal-bearing gas includes a shell 5 containing a solid powdered metal-bearing compound, chromium carbonyl 6.
  • the shell 5 is surrounded by a hollow coil 7, and the coil and shell are submerged in oil 8 of tank 9, the whole assembly being adapted to be heated by electric heater 10 to a substantially constant temperature at which chormium carbonyl has a relatively high vapor pressure.
  • oil 8 contacts one element 11 of a thermostatic control which is suitably connected with heater 10 in the known manner for regulation of heat input to the system.
  • a stirrer 12 driven by motor 13 may be employed.
  • the coil 7 surrounding shell 5 is connected at one end through hollow tube 14 to the valve 3 and the other end thereof is secured in an opening in the lower portion of shell 5.
  • the upper portion of shell 5 is provided with a second opening in which hollow insulated tubing 15 is secured.
  • coil 1S is of the same material as apertured tube 16 of plating chamber C, now to be described, the members 15 and 16 may be integral.
  • Plating chamber system C as mors clearly shown in Figure 2, comprises a hollow, apertured tube 16 of a ceramic material and has the opposing ends thereof on the outer circumference secured in gas tight relation to cylindrical metallic bearing members .17 and 18.
  • Members 17 and 1S each extend along a sufficient length of the circumference of tube 16 to provide adequate support therefor.
  • a hollow object 19 Surrounding the gas carrying apertured tube 16 is a hollow object 19 in the form of an open ended hollow cylinder and which is to be plated on the interior wall 20. Cylinder 19 is provided on the outer circumference with a layer of heat insulating material, as asbestos, 21, on which there is superimposed a resistance heating coil 22 connected to electrical inlet and outlet 23 and 24, respectively.
  • cylinder 19 The left hand end of cylinder 19 is provided with a ring gasket 25 which is secured in position by a novel ange 4member 26 recessed as at 27 for engaging the gasket and cylinder along area 28 ( Figure 3).
  • Flange 26 is provided with a central bore 29 into which extends a bearing 30 for rotating engagement with the cylindrical member 17 when the same is passed through bore 29.
  • a satisfactory gas seal between the cylindrical shaped members 17 and 30 is established by providing a neoprene gasket 31 about the member 17 in tight fitting relation with the lateral outward portion of member 26.
  • the outer circumference 32 of member 26, as at 32, is provided with a surface of friction material, as for example, rubber bonded securely to the metal of the flange member, and this surface is engaged by a second friction member 33 driven through suitable reduction gearing 34 by a motor 35.
  • Line 41 may be force fitted into the system and a ⁇ feature thereof is the ready removability for mass production purposes.
  • the line 41 contains a baflie 68 for directing the flow of gases to a trap 42 which is surrounded by cooling water 43 contained .invessel44 having inlet 46 and outlet 45 forV the passage of the water.
  • This assembly is then pressured onto flange 26overthe'ceramic tube lo'each of 'which componentsare initially'secured to the apparatus extending to the left of Figure l.
  • - Flange 36 and gasket 25 are then pressured onto the right hand end of object 19-and the ⁇ removable exhaust 'linesection 41 -is fitted intothe bearing surface 40 of hollow cylindrical member 39 to connect the same with the permanently positioned apparatus extending to theright of y Figure l.
  • This system is then swept clear of air by flushing as with carbondioxide or other inert gas.
  • the gases'passingthrough insulated tubing 15' enter the 'chamber defined by hollow object i9 through the kvslots in the ceramic'tube 16.
  • the motor 35 which as noted is adapted to drive object i9 in rotation has meanwhile'been started, and the entering carrier gases will be -givenaslight'circular motion as they approach the Wall 20. 4The resistanceheater V21?; having been brought up to atemperaturer of about 650 F. prior to entry of the plating gas has heated the wall 20 and Aupon contact of thegases with the wallthe gases decompose depositing chromium thereon.
  • the uniformity ofthe chromium deposit isvfimproved by rotation of the object i9 since the gases are more uniformly distributed within the object.
  • waste gases of decomposition such as carbon monoxide then pass on to the pump and the atmosphere.
  • the object i9 if assumed to be approximately l in internal diameter, may be thus coated with a .001 of chromium in about l5 minutes;when'utilizing a carbon dioxide ow rate at valve 3 of one liter per minut-e and an oil bath temperature of 240 F.,. the pressure within the object or plating chamber being maintained at about l2 pounds per square inch absolute.
  • FIG. 4 and 5 there is shown a 'slotted tube 48 provided with fins 49 .extending therefrom adjacent slots or openings 5G, other lins S1 being provided between the slots.
  • the fins 49 serve todirect the ow of gases from the openings 50, while the fins 51 when used serve to prevent the formation of gaspockets at low gas flow rates. It will be apparent that fins' 49 and Si may be used together or individually as desired.
  • Figures 6 and 7 illustrate a modification of the slotted tube of Figure l which is particularly suitable in applica tions where the object to be plated is relatively long. Since the gas carrying tube of ceramic or'other material must be substantially co-extensive with the object in order to provide for uniform deposition of metal the Weight of the ceramic tube may cause a buckling along the length, resulting in short life of the equipment.
  • the device of Figures 6 and 7 eliminates this difficulty by providing the slotted tube 52 with bearing surfaces 53 which Contact in sliding engagement the bearing surface 54 of a -member 55 in the form of a U having the arm carrying the surface 54 more shortened.
  • the longer arm 56 is slotted as at 57 and secured to a flange 58 (similar to lt is desirable that slots 57 be spaced closely adjacent the slots of the gas carrying member to prevent the formation of dead spots in the plating chamber.
  • This support structure may of course also be provided on a flangesimilar to 36 of Figure l or supports may, where required, be extended from both flanges.
  • Attach- '1 ment of gaskets 62 and 63 and flanges 64 and 65 is 60 must be heat conductive in order to insure that the wall portions of object 6l opposite the elements are com- Vbore openings in said members, said tube being open at one end and closed at the other and having apertures in the .body thereof, each ofsaid members having an annular groove on the inner facethereof, said annular grooves v vreceiving and hermetically sealing the ends of said hollow open-ended. object, bearings arranged in the bore openings of said ⁇ flange members for supporting said flange member-andhollow object for rotation, and means for rotating vsaid flange members and hollow object as a unit about said stationary tube and while supported on said bearings.

Description

May 21, 1957 P. PAWLYK 2,792,806
APPARATUS FOR PLATING THE INTERIOR OF HOLLOW OBJECTS Original Filed Oct. 8, 1951 5 Sheets-Sheet l agi l l0 v l INVENTOR. t Y PETER PAwLYn BY C\'J M i /oablnum/ ATToRNEYs P. PAWLYK May 21, 1957 APPARATUS FOR PLATNG THE INTERIOR OF' HOLLOW OJECTS 3 Sheets-Sheet 2 Original Filed Oct. 8, 1951 INVENTOR. PETER PAWLYK al "Wl",
ATToRNEYs May 21, 1957 P. PAWLYK 2,792,806
APPARATUS FOR PLATING THE INTERIOR OF HOLLOW OBJECTS Original Filed Oct. 8, 1951 3 Sheets-Sheet 3 INVENTOR.
PETER PAwLYK [-1578 'A BY mm@ ATTORNEYS United States Patent O APPARATUS FOR PLATING THE NTERIOR OF HOLLOW OBJECTS Peter Pawlyk, Dayton, Ohio, assignor to The Commonwealth Engineering Company of Ohio, Dayton, Ohio, a corporation of Ohio 2 Claims. (Cl. 118-43) This invention relates to apparatus and methods for the coating of metallic bases with metallic coats deposited from the vapor state by the thermal decomposition of metal-bearing gases. More particularly the invention relates to the uniform coating of the interior of hollow objects of tubular structure such as gun barrels and cylindrical bearing surfaces.
This application is a division of my application Serial No. 250,306, led October 8, 1951, now U. S. Patent No. 2,729,190.
A primary object of the present invention is to'provide improved apparatus whereby the interior plating of hollow objects may be uniformly achieved. i
An important object of the present invention is to provide equipment for the plating of hollow objects on a mass production basis.
A principal object of the invention is to provide an improved apparatus for the interior plating of hollow objects.
The invention comprises a gas plating system in which the object to be plated itself forms walls of the plating chamber, and which object is rotated about a slotted tube adapted to bear the volatilized metal-bearing compound to the object. Features of the system include means for the mounting of the hollow object about the slotted tube for the rotation of the object, means to direct the ow of the plating gases uniformly to the interiorrwalls of the object, and means to provide for the uniformity of plating gas ow through the system.
The invention also includes the feature of ready interchangeability of plating objects which facilitates the use of mass production methods in the gas plating of hollow objects. Substantially all materials which decompose under the inuence of heat are operable in thej process of invention, the compounds containing chomium and nickel, e. g. nickel carbonyl being most suitable.
The invention will be more fully understood by reference to the following detailed description and accompanying drawings wherein;
Figure 1 is a schematic representation of one embodiment of the apparatus of invention;
Figure 2 is an enlarged sectional view of the object to be plated including means illustrating the mounting thereof;
Figure 3 is a View of the left hand end of the structure shown in Figure 2;
Figure 4 is a view in section of a modification of the slotted tube of Figure 2;
Figure 5 is an end view of the structure of Figure 4;
Figure 6 illustrates a modified form of the invention particularly adapted for the plating of long hollow objects;
Figure 7 is a view of a portion of the structure of Figure 6; and
Figure 8 illustrates a method of mounting a hollow object to secure plating of the entire interior surface.
Referring to Figure '1 the apparatus is shown to comprise the following general components: a source A of inert carrier gas; a substantially constant temperature source B of metal-bearing gas; a'plating chamber systemv ice C; a recovery system D; and a vacuum pump system E for controlling plating gas ow.
Source A may comprise a conventional cylinder 1 containing carbon dioxide 2 under pressure. The cylinder is provided with a valve 3 for the control of gaseous carbon dioxide flow therefrom and a gauge 4 for indicating the flow rate.
The source B of metal-bearing gas: includes a shell 5 containing a solid powdered metal-bearing compound, chromium carbonyl 6. The shell 5 is surrounded by a hollow coil 7, and the coil and shell are submerged in oil 8 of tank 9, the whole assembly being adapted to be heated by electric heater 10 to a substantially constant temperature at which chormium carbonyl has a relatively high vapor pressure. To assure of adequate temperature control the oil 8 contacts one element 11 of a thermostatic control which is suitably connected with heater 10 in the known manner for regulation of heat input to the system. To avoid localized heating a stirrer 12 driven by motor 13 may be employed.
The coil 7 surrounding shell 5 is connected at one end through hollow tube 14 to the valve 3 and the other end thereof is secured in an opening in the lower portion of shell 5. The upper portion of shell 5 is provided with a second opening in which hollow insulated tubing 15 is secured.
Where coil 1S is of the same material as apertured tube 16 of plating chamber C, now to be described, the members 15 and 16 may be integral.
Plating chamber system C, as mors clearly shown in Figure 2, comprises a hollow, apertured tube 16 of a ceramic material and has the opposing ends thereof on the outer circumference secured in gas tight relation to cylindrical metallic bearing members .17 and 18. Members 17 and 1S each extend along a sufficient length of the circumference of tube 16 to provide adequate support therefor.
Surrounding the gas carrying apertured tube 16 is a hollow object 19 in the form of an open ended hollow cylinder and which is to be plated on the interior wall 20. Cylinder 19 is provided on the outer circumference with a layer of heat insulating material, as asbestos, 21, on which there is superimposed a resistance heating coil 22 connected to electrical inlet and outlet 23 and 24, respectively.
The left hand end of cylinder 19 is provided with a ring gasket 25 which is secured in position by a novel ange 4member 26 recessed as at 27 for engaging the gasket and cylinder along area 28 (Figure 3). Flange 26 is provided with a central bore 29 into which extends a bearing 30 for rotating engagement with the cylindrical member 17 when the same is passed through bore 29. As the rate of rotation for member 19 will always be relatively slow a satisfactory gas seal between the cylindrical shaped members 17 and 30 is established by providing a neoprene gasket 31 about the member 17 in tight fitting relation with the lateral outward portion of member 26.
The outer circumference 32 of member 26, as at 32, is provided with a surface of friction material, as for example, rubber bonded securely to the metal of the flange member, and this surface is engaged by a second friction member 33 driven through suitable reduction gearing 34 by a motor 35. i
Flange 36 at the right end of cylinder 19 is constructed similarly to iiange 26, and accordingly will not be described in detail. However flange 36 is not driven directly but is rotated with flange 26 and cylinder 19 by means of motor 35. This flange 36 also diers from ange 26 in that it is provided with a cylindrical member 39 having an internal bearing surface 40, the purpose of which will be described hereinafter; also flange 36 has openings as at 37 and 38 which serve as exhaust `ports lforthe flow of=waste gases to recovery systemDfthrough pipeline 41 having the inlet end engaging bearing surface 4t) and the other end ofwhich terminates in a trap 42 for the condensation of metal-bearing vapors. Line 41 may be force fitted into the system and a `feature thereof is the ready removability for mass production purposes. The line 41 contains a baflie 68 for directing the flow of gases to a trap 42 which is surrounded by cooling water 43 contained .invessel44 having inlet 46 and outlet 45 forV the passage of the water.
The outlet end of trap 42-is secured tofa vacuum pump 47. Pump 47 is not an essentiall requirement of the system where high flow-rates may be'obtained by pressure means inthe earlierparts of theapparatus but is essential where it is desirable to maintain low'pressures in the plating-chamber.
Intheoperation of the apparatus of'pF-igures' 1,' `2y and 3 thefobject to be plated,=after the customary cleaning of the interior surface with acid and alcohol or any con venient-means, is first wound on the outer rside with the layer21 of asbestos. --Thefheating coil Vis then slipped over the Yinsulating material and the gasket ZS-tted over theobjeet end. This assembly is then pressured onto flange 26overthe'ceramic tube lo'each of 'which componentsare initially'secured to the apparatus extending to the left of Figure l.- Flange 36 and gasket 25 are then pressured onto the right hand end of object 19-and the `removable exhaust 'linesection 41 -is fitted intothe bearing surface 40 of hollow cylindrical member 39 to connect the same with the permanently positioned apparatus extending to theright of yFigure l. `This system is then swept clear of air by flushing as with carbondioxide or other inert gas.
Y buretor 5.
l The solid chromium carbonyl having been heated to vapproximately the temperature of the oil has thereby attained a relatively large vapor pressure, but without the Vapplication of external pressure to the vapors very little flow thereof takes place. The heated carbon dioxide gas driven by the pressure from cylinder 2 and expanding under the influence of the heat absorbed from oil 8 will sweep the carbonyl vapors with it to line 15 thus re- -ducing or tending to reduce the carbonylv vapor pressure yin the chamber, allowing more carbonyl to vaporize. Also sincefthe carbon dioxide carrier gas is at substantially theY same pressure as the carburetor, substantially vno cooling of the chromium'carbonyl will be effected by contactl with the carrier gas.
The gases'passingthrough insulated tubing 15' enter the 'chamber defined by hollow object i9 through the kvslots in the ceramic'tube 16. The motor 35 which as noted is adapted to drive object i9 in rotation has meanwhile'been started, and the entering carrier gases will be -givenaslight'circular motion as they approach the Wall 20. 4The resistanceheater V21?; having been brought up to atemperaturer of about 650 F. prior to entry of the plating gas has heated the wall 20 and Aupon contact of thegases with the wallthe gases decompose depositing chromium thereon.
The uniformity ofthe chromium deposit isvfimproved by rotation of the object i9 since the gases are more uniformly distributed within the object.
The wastegases from the thermal decomposition-are drawn under the influence of pump 47 which was acti- I- vated .just prior to .starting gas ow, to the pipe 41 and are -passed to,A trap 42 wherein Iany chromium carbonyl,
- remaining undecomposed, is deposited, through the effect of cooling water 43 circulating about trap 42.
The waste gases of decomposition such as carbon monoxide then pass on to the pump and the atmosphere.
The object i9, if assumed to be approximately l in internal diameter, may be thus coated with a .001 of chromium in about l5 minutes;when'utilizing a carbon dioxide ow rate at valve 3 of one liter per minut-e and an oil bath temperature of 240 F.,. the pressure within the object or plating chamber being maintained at about l2 pounds per square inch absolute.
Various modifications of portions of the structure of Figure l, particularly relating tothe structure of plating vflange 26) which thensupports the tube 52.
- chamber system C, are setforth in Figures 4 to 9, in-
clusive. Thus in Figures 4 and 5 there is shown a 'slotted tube 48 provided with fins 49 .extending therefrom adjacent slots or openings 5G, other lins S1 being provided between the slots. The fins 49 serve todirect the ow of gases from the openings 50, while the fins 51 when used serve to prevent the formation of gaspockets at low gas flow rates. It will be apparent that fins' 49 and Si may be used together or individually as desired.
Figures 6 and 7 illustrate a modification of the slotted tube of Figure l which is particularly suitable in applica tions where the object to be plated is relatively long. Since the gas carrying tube of ceramic or'other material must be substantially co-extensive with the object in order to provide for uniform deposition of metal the Weight of the ceramic tube may cause a buckling along the length, resulting in short life of the equipment. The device of Figures 6 and 7 eliminates this difficulty by providing the slotted tube 52 with bearing surfaces 53 which Contact in sliding engagement the bearing surface 54 of a -member 55 in the form of a U having the arm carrying the surface 54 more shortened. The longer arm 56 is slotted as at 57 and secured to a flange 58 (similar to lt is desirable that slots 57 be spaced closely adjacent the slots of the gas carrying member to prevent the formation of dead spots in the plating chamber. This support structure may of course also be provided on a flangesimilar to 36 of Figure l or supports may, where required, be extended from both flanges.
1 lIt will be noted that in Figure l the ends of the object 19 are covered to a slight extent by the gaskets and flanges, thuspreventing deposition of metal to the very end of the structure. The apparatus of Figure 8 overcomes this ob- .jection by providing cylindrical elements 59 and tlwhich are secured over the object 6l at opposing ends. Attach- '1 ment of gaskets 62 and 63 and flanges 64 and 65 is 60 must be heat conductive in order to insure that the wall portions of object 6l opposite the elements are com- Vbore openings in said members, said tube being open at one end and closed at the other and having apertures in the .body thereof, each ofsaid members having an annular groove on the inner facethereof, said annular grooves v vreceiving and hermetically sealing the ends of said hollow open-ended. object, bearings arranged in the bore openings of said` flange members for supporting said flange member-andhollow object for rotation, and means for rotating vsaid flange members and hollow object as a unit about said stationary tube and while supported on said bearings.
2. In combination with a hollow open-ended object to be treated interiorly while rotated, means consisting of circular ange members for closing the open ends of said object, said flange members having a central bore opening therein, a stationary tube extending through the central bore openings in 'said members, said tube being open at one end and closed at the other and having apertures in the body thereof, each of said members having an annular groove on the inner face thereof, said annular grooves receiving and hermetically sealing the ends of said hollow openended object, bearings arranged in the bore openings of said ange members for supporting said flange member and hollow object for rotation, and means for rotating said flange members and hollow object as a unit about said stationary tube and while supported on said bear- References Cited in the file of this patent UNITED STATES PATENTS 1,422,550 Egerton July 11, 1922 2,336,946 Marden et a1 Dec. 14, 1943 2,449,655 Keiter Sept. 21, 1948 2,503,863 Bart Apr. 11, 1950 2,602,033 Lander July 1, 1952 2,685,124 Toulmin Aug. 3, 1954 2,700,365 Pawlyk Jan. 25, 1955
US411842A 1951-10-08 1953-11-30 Apparatus for plating the interior of hollow objects Expired - Lifetime US2792806A (en)

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US411842A US2792806A (en) 1951-10-08 1953-11-30 Apparatus for plating the interior of hollow objects

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3460816A (en) * 1962-01-02 1969-08-12 Gen Electric Fluxless aluminum brazing furnace
US4183320A (en) * 1976-08-21 1980-01-15 Maschinenfabrik Augsburg-Nurnberg Aktiengesellschaft Apparatus for nickel plating
FR2431548A1 (en) * 1978-07-17 1980-02-15 Ch Gi Gas case hardening pipes for conveying abrasive materials - uses two centering pipes to feed gas and has ring induction heater and spray on trolley

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1422550A (en) * 1918-10-15 1922-07-11 Henry C Egerton Friction-driving device
US2336946A (en) * 1941-12-10 1943-12-14 Westinghouse Electric & Mfg Co Method and apparatus for coating envelopes for electric lamps
US2449655A (en) * 1944-05-11 1948-09-21 Gen Electric Coating apparatus for tubular objects
US2503863A (en) * 1943-11-18 1950-04-11 Siegfried G Bart Apparatus for electroplating the inside of pipes
US2602033A (en) * 1950-01-18 1952-07-01 Bell Telephone Labor Inc Carbonyl process
US2685124A (en) * 1951-04-30 1954-08-03 Ohio Commw Eng Co Method for hi-vac alloying and coated product
US2700365A (en) * 1951-10-08 1955-01-25 Ohio Commw Eng Co Apparatus for plating surfaces with carbonyls and other volatile metal bearing compounds

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1422550A (en) * 1918-10-15 1922-07-11 Henry C Egerton Friction-driving device
US2336946A (en) * 1941-12-10 1943-12-14 Westinghouse Electric & Mfg Co Method and apparatus for coating envelopes for electric lamps
US2503863A (en) * 1943-11-18 1950-04-11 Siegfried G Bart Apparatus for electroplating the inside of pipes
US2449655A (en) * 1944-05-11 1948-09-21 Gen Electric Coating apparatus for tubular objects
US2602033A (en) * 1950-01-18 1952-07-01 Bell Telephone Labor Inc Carbonyl process
US2685124A (en) * 1951-04-30 1954-08-03 Ohio Commw Eng Co Method for hi-vac alloying and coated product
US2700365A (en) * 1951-10-08 1955-01-25 Ohio Commw Eng Co Apparatus for plating surfaces with carbonyls and other volatile metal bearing compounds

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3460816A (en) * 1962-01-02 1969-08-12 Gen Electric Fluxless aluminum brazing furnace
US4183320A (en) * 1976-08-21 1980-01-15 Maschinenfabrik Augsburg-Nurnberg Aktiengesellschaft Apparatus for nickel plating
FR2431548A1 (en) * 1978-07-17 1980-02-15 Ch Gi Gas case hardening pipes for conveying abrasive materials - uses two centering pipes to feed gas and has ring induction heater and spray on trolley

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