US366353A - thompson - Google Patents

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US366353A
US366353A US366353DA US366353A US 366353 A US366353 A US 366353A US 366353D A US366353D A US 366353DA US 366353 A US366353 A US 366353A
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filament
vapor
thompson
jar
electric
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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
    • C23C16/22—Chemical coating by decomposition of gaseous compounds, without leaving reaction products of surface material in the coating, i.e. chemical vapour deposition [CVD] processes characterised by the deposition of inorganic material, other than metallic material
    • C23C16/28—Deposition of only one other non-metal element

Definitions

  • the invention relates to the process of depositing carbon upon electric-light filaments.
  • the invention consists, in general terms, in applying a hydrocarbon vapor under pressure to a filament while a current of electricity is being passed through the same, the object being to cause the hydrocarbon to permeate the filament, thus filling the pores instead of being deposited merely upon the surface.
  • A represents a belljar adapted to beplaced upon a stand or table, B, and tittightly against the same in any usual manner.
  • a suitable clamp, c, and bindingscrew 0 may be employed in holding the jar in position.
  • a tube, 0 leads from the belljar and is provided with a valve, 0 for allowing the air to be expelled therefrom.
  • a filament, D shall be placed within the globe, being held by suitable clamps, (Z d, which are connected with the respective poles of a generator, E, by conductors 1 and 2, the latter of which may include a galvanometer, F.
  • a tube, 9, leads from a tank or vessel, G, to the bell-jar.
  • This tube is employed for conducting hydrocarbon vapor from the vessel or tank G to the bell-jar.
  • the tube is covered with asbestus or other heat-retaining substance for the purpose of preventing the carbon vapor from losing its heat.
  • the tank containing the hydrocarbon liquid is maintained at a temperature sufficient to vaporize the same by means of a furnace or lamp, as shown at H.
  • a safety-valve, h may be applied to the tank for the purpose of preventing too great a pressure on the part of the vapor.
  • the filament is raised to a high temperature by means of an electric current caused to traverse a circuit including the filament.
  • hydrocarbon vapor is caused to fill the bell-jar, and, being under pressure, it is forced into the pores of the filament,which are opened by reason of the heat.
  • the galvanometer F serves to indicate the strength of current being employed, and also by means of its position it maybe determined when the filament has obtained the required thickness and density.

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  • Chemical & Material Sciences (AREA)
  • Inorganic Chemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Engineering & Computer Science (AREA)
  • Materials Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Metallurgy (AREA)
  • Organic Chemistry (AREA)
  • Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
  • Chemical Vapour Deposition (AREA)

Description

(N3 Model.)
B. P. THOMPSON.
PROUE$S OF MAKING INGANDESGENTS. No. 333,353. Patented July 12, 1887,.
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UNITED STATES PATENT OFFICE.
EDI/VARD I THOMPSON, OF ELIZABETH, NE? JERSEY.
PROCESS OF MAKING INCANDESCENTS.
SPECIFICATION forming part of Letters Patent No. 366,353, dated July 12, 1887.
Application filed September 15, 1886. Serial No. 2l3.577. (No model.)
To all whom it may concern.-
Be it known thatl, EDWARD. P. THOMPSON, a citizen of the United States, residing in Elizabeth, in the county of Union and State of New Jersey, have invented certain new and useful Improvements in the Process of Forming Incandescent Electric-Light Filaments, of which the following is a specification.
The invention relates to the process of depositing carbon upon electric-light filaments.
The invention consists, in general terms, in applying a hydrocarbon vapor under pressure to a filament while a current of electricity is being passed through the same, the object being to cause the hydrocarbon to permeate the filament, thus filling the pores instead of being deposited merely upon the surface.
The accompanying drawing illustrates an apparatus adapted to carry out the invention.
Referring to the figure, A representsa belljar adapted to beplaced upon a stand or table, B, and tittightly against the same in any usual manner. A suitable clamp, c, and bindingscrew 0 may be employed in holding the jar in position. A tube, 0 leads from the belljar and is provided with a valve, 0 for allowing the air to be expelled therefrom. It is designed that a filament, D, shall be placed within the globe, being held by suitable clamps, (Z d, which are connected with the respective poles of a generator, E, by conductors 1 and 2, the latter of which may include a galvanometer, F. A tube, 9, leads from a tank or vessel, G, to the bell-jar. This tube is employed for conducting hydrocarbon vapor from the vessel or tank G to the bell-jar. Preferably the tube is covered with asbestus or other heat-retaining substance for the purpose of preventing the carbon vapor from losing its heat. The tank containing the hydrocarbon liquid is maintained at a temperature sufficient to vaporize the same by means of a furnace or lamp, as shown at H. By means of the heat the Vapor may be placed under enormous pressure. A safety-valve, h, may be applied to the tank for the purpose of preventing too great a pressure on the part of the vapor.
In practice the filament is raised to a high temperature by means of an electric current caused to traverse a circuit including the filament. At the same time hydrocarbon vapor is caused to fill the bell-jar, and, being under pressure, it is forced into the pores of the filament,which are opened by reason of the heat. The galvanometer F serves to indicate the strength of current being employed, and also by means of its position it maybe determined when the filament has obtained the required thickness and density.
I claim as my invention- 1. The combination, substantially as hereinbefore set forth, of ajar for receiving an incandescent electric-light filament, means for placing the filament in an electric circuit, a source of hydrocarbon vapor, and means for causing said vapor to be held in the jar under pressure.
2. The hereinbefore 4 described process of treating filaments for incandescent electric lights, which consists in applying a hydrocarbon vapor to the same under pressure, and at the same time heating the filaments by an electric current.
3. The combination, with a bell-jar and means for inclosing an incandescent electric light filament within the same, of an electric circuit, including the filament, of a vapor supply, an escape-valve, and means for maintaining the vapor within thejar under pressure.
In testimony whereof I have hereunto subscribed my name this 17th .day of August, A. D. 1886.
EDWARD P. THOMPSON.
WVitnesses:
DANL. W. EocnooMB, CHARLES A. TERRY.
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