US1668742A - Apparatus for making electron-emitting means - Google Patents

Apparatus for making electron-emitting means Download PDF

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Publication number
US1668742A
US1668742A US527178A US52717822A US1668742A US 1668742 A US1668742 A US 1668742A US 527178 A US527178 A US 527178A US 52717822 A US52717822 A US 52717822A US 1668742 A US1668742 A US 1668742A
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United States
Prior art keywords
coating material
chamber
emitting means
filament
boat
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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
US527178A
Inventor
Stoekle Erwin Rudolph
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.)
AT&T Corp
Original Assignee
Western Electric Co Inc
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 Western Electric Co Inc filed Critical Western Electric Co Inc
Priority to US527178A priority Critical patent/US1668742A/en
Application granted granted Critical
Publication of US1668742A publication Critical patent/US1668742A/en
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Expired - Lifetime legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J9/00—Apparatus or processes specially adapted for the manufacture, installation, removal, maintenance of electric discharge tubes, discharge lamps, or parts thereof; Recovery of material from discharge tubes or lamps
    • H01J9/02—Manufacture of electrodes or electrode systems
    • H01J9/04—Manufacture of electrodes or electrode systems of thermionic cathodes
    • H01J9/06—Machines therefor

Definitions

  • This invention relates to the manufacture of electron-emitting elements such as electrodes for discharge devices,
  • the electron emissivity of substances such as platinum is greatly increased when coated with alkaline earth metal oxides, such as barium, strontium and calcium oxide.
  • This object is accomplished by supporting the filament to be coated and a supply of the coating material within a vessel which is preferably evacuated and heating the coat- 1ng material to ,cause it to be deposited upon thefilament.
  • a g ass tube 1 is provided with a neck 2, by means of which it may be attached to a vacuum pump (not shown).
  • the lead wires 3 and 4 In one wall of the tube are sealed the lead wires 3 and 4, to the lower ends of which is attached the filament 5 to be coated.
  • the outer ends of the 7 lead wires 3 and 4 are connected to the terminal of'a battery or other source of electrical energy 6. Sealed in the end of the tube opposite the neck 2 are relatively heavy volatilize by current supplied from a battery 11. The volatilized material is de osited upon the filament 5. After a su cient coating has been deposited, uponwthe .fila-' ment 5, current is passed therethrough means in said chamber oxides.
  • a platinum filament provided with' such a coating has a greater degree of thermionic emissivity than an unco'ated filament operated under thesame temperature conditions.
  • a chamber a metallic boat in said chamber 'forholding coating material, means" for heatin said coating material, and means in said 0 iamber for supporting the filament out of contact with the coating material.
  • a device of the character described a chamber, a metallic boat in said chamber for holding coating material, lead wires for sup- I porting-said .boat and supplying electrical energy thereto, and means insaid chamberv for supporting a filament out of contact with the coating material.

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  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Physical Vapour Deposition (AREA)

Description

May 8, 1928. 1,668,742 E. R. STOEKLE APPARATUS FOR MAKING ELECTRON EMITTING MEANS Filed Jan. 5. 1922 Patented Ma s, 1928.
UNITED STATES PATENT OFFICE.
EB'WIN RUDOLPH STOEKLE, OF MILWAUKEE, WISCONSIN, ASSIGNOR TO WESTERN ELECTRIC COMPANY, INCORPORATED, OF NEW YORK, N. Y., A. CORPORATION 01 NEW YORK.
APPARATUS FOR MAKING- ELEC'IRON-EMI'ITING MEANS.
Application filed January 5, 1922. Serial No. 527,178.
This invention relates to the manufacture of electron-emitting elements such as electrodes for discharge devices,
The electron emissivity of substances such as platinum is greatly increased when coated with alkaline earth metal oxides, such as barium, strontium and calcium oxide.
It is the object of this invention to provide a simple and efiicient apparatus for and method of applying such a coatng to an electrode element; for example, a lament. This object is accomplished by supporting the filament to be coated and a supply of the coating material within a vessel which is preferably evacuated and heating the coat- 1ng material to ,cause it to be deposited upon thefilament. r
This invention will be better understood by having reference to the following specification and accompanying drawing, wherein the ap aratus is disclosed.
A g ass tube 1 is provided with a neck 2, by means of which it may be attached to a vacuum pump (not shown). In one wall of the tube are sealed the lead wires 3 and 4, to the lower ends of which is attached the filament 5 to be coated. The outer ends of the 7 lead wires 3 and 4 are connected to the terminal of'a battery or other source of electrical energy 6. Sealed in the end of the tube opposite the neck 2 are relatively heavy volatilize by current supplied from a battery 11. The volatilized material is de osited upon the filament 5. After a su cient coating has been deposited, uponwthe .fila-' ment 5, current is passed therethrough means in said chamber oxides. A platinum filament provided with' such a coating has a greater degree of thermionic emissivity than an unco'ated filament operated under thesame temperature conditions.
What is claimed is:
1. In a device of the character described, a chamber, a metallic boat in said chamber 'forholding coating material, means" for heatin said coating material, and means in said 0 iamber for supporting the filament out of contact with the coating material.
2. In a device of the character described; a chamber, a metallic boat in said chamber for holding coating material, lead wires for sup- I porting-said .boat and supplying electrical energy thereto, and means insaid chamberv for supporting a filament out of contact with the coating material.
3. In a device of the character described,
an evacuated chamber, a metallic boat in said chambenfor holdinfg or passing heatin current through said boat to volatilize sai coating material and means for supporting a filament out of contact with the coating material.
4..In a device of the character described, an evacuated chamber, a metallic .boat in said chamber for holding coating material} lead wires for supporting said boat and supplying electrical energy thereto, and means in said chamber for supporting a filameiit out of contact with the coating materla s I In witness whereof, I hereunto subscribe my name this 19th day of December, A'." D. 1921. w
. X, T ERWIN RUDOLPH STOEKLE. i i
coating material,
US527178A 1922-01-05 1922-01-05 Apparatus for making electron-emitting means Expired - Lifetime US1668742A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
US527178A US1668742A (en) 1922-01-05 1922-01-05 Apparatus for making electron-emitting means

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Application Number Priority Date Filing Date Title
US527178A US1668742A (en) 1922-01-05 1922-01-05 Apparatus for making electron-emitting means

Publications (1)

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US1668742A true US1668742A (en) 1928-05-08

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