GB191209941A - Improvements in or relating to the Manufacture of Electric Incandescence Filaments or Bodies. - Google Patents

Improvements in or relating to the Manufacture of Electric Incandescence Filaments or Bodies.

Info

Publication number
GB191209941A
GB191209941A GB191209941DA GB191209941A GB 191209941 A GB191209941 A GB 191209941A GB 191209941D A GB191209941D A GB 191209941DA GB 191209941 A GB191209941 A GB 191209941A
Authority
GB
United Kingdom
Prior art keywords
filaments
tungsten
compound
heated
zinc
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
Application number
Inventor
Friedrich Hansen
William Frederick Mohr
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of GB191209941A publication Critical patent/GB191209941A/en
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01K—ELECTRIC INCANDESCENT LAMPS
    • H01K3/00—Apparatus or processes adapted to the manufacture, installing, removal, or maintenance of incandescent lamps or parts thereof
    • H01K3/02—Manufacture of incandescent bodies

Abstract

9941. Hansen, F., and Mohr, W. F. April 26. Filaments are made hy a paste process from a compound of tungsten and boron prepared as described below. The compound has a higher resistance than pure tungsten, and is obtained as a dark grey or black powder, having a sp. g. of 12-16 and burning if heated above 150‹ C'. in air. It may be squirted with a thick collodion paste, the resulting filaments being carbonized in a vacuum by heating to 850‹ C. and decarbonized and sintered, also in a vacuum, by passage of current. In making the compound, tungsten trioxide is saturated with a hot solution of boric acid, dried, and heated to 700‹ C., the product being reduced by heating with zinc to 1,100‹ C., and subsequently freed from zinc, washed, and dried. According to the Provisional Specification, a mixture of tungsten and boron may be made into filaments or heated previously to form a compound. Also, tungsten may be replaced by tantalum, osmium, tellurium, and the like. Filaments, attaching.-These filaments may be clamped to leading-in wires, but the clips or holders should consist of chromium-nickelsteel or copper, and not of platinum.
GB191209941D 1912-04-26 1912-04-26 Improvements in or relating to the Manufacture of Electric Incandescence Filaments or Bodies. Expired GB191209941A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB191209941T 1912-04-26

Publications (1)

Publication Number Publication Date
GB191209941A true GB191209941A (en) 1913-04-28

Family

ID=34358399

Family Applications (1)

Application Number Title Priority Date Filing Date
GB191209941D Expired GB191209941A (en) 1912-04-26 1912-04-26 Improvements in or relating to the Manufacture of Electric Incandescence Filaments or Bodies.

Country Status (1)

Country Link
GB (1) GB191209941A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2984807A (en) * 1960-03-23 1961-05-16 Borolite Corp Corrosion-resistant high-temperature bodies for metal vaporizing heaters and other applications

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2984807A (en) * 1960-03-23 1961-05-16 Borolite Corp Corrosion-resistant high-temperature bodies for metal vaporizing heaters and other applications

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