GB190825854A - Improvements in the Manufacture of Electric Incandescence Filaments from Tungsten or other Difficulty Fusible Metal. - Google Patents
Improvements in the Manufacture of Electric Incandescence Filaments from Tungsten or other Difficulty Fusible Metal.Info
- Publication number
- GB190825854A GB190825854A GB190825854DA GB190825854A GB 190825854 A GB190825854 A GB 190825854A GB 190825854D A GB190825854D A GB 190825854DA GB 190825854 A GB190825854 A GB 190825854A
- Authority
- GB
- United Kingdom
- Prior art keywords
- filaments
- ductile metal
- tungsten
- fusion
- manufacture
- 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
Links
Abstract
25,854. Siemens & Halske Akt.-Ges. Dec. 11, 1907, [date applied for under Section 91 of Patents &c. Act, 1907]. Working by unclassified operations.-Filaments of tungsten or the like, for electric lamps, are made by galvanically or chemically coating the powdered refractory metal with a ductile metal such as gold, silver, nickel, copper, or platinum, and then, without fusion, working it into filaments from which the ductile metal is subsequently expelled by passage of an electric current in a vacuum. The coated powder may be worked up by pressing or preferably by rolling and optionally beating, and may then be drawn. Or it may be stamped into a tube of ductile metal such as tantalum and drawn or rolled, as described in Specification No. 4814, A.D. 1907, the tube being subsequently removed chemically, mechanically, or by fusion. The Specification in the original form, as open to inspection under Section 91 (3) (a), comprises also the use of a mixture of refractory and ductile metal powder and the amalgamation of the coated powder by dipping it in mercuric chloride solution. This subject-matter does not appear in the Complete Specification as accepted.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE190825854X | 1907-12-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB190825854A true GB190825854A (en) | 1909-05-06 |
Family
ID=32405124
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB190825854D Expired GB190825854A (en) | 1907-12-11 | 1908-11-30 | Improvements in the Manufacture of Electric Incandescence Filaments from Tungsten or other Difficulty Fusible Metal. |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB190825854A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3269804A (en) * | 1963-11-01 | 1966-08-30 | Gen Electric | Dispenser cathode and method for the production thereof |
| US3275435A (en) * | 1963-11-01 | 1966-09-27 | Gen Electric | Method of production of a dispenser cathode |
-
1908
- 1908-11-30 GB GB190825854D patent/GB190825854A/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3269804A (en) * | 1963-11-01 | 1966-08-30 | Gen Electric | Dispenser cathode and method for the production thereof |
| US3275435A (en) * | 1963-11-01 | 1966-09-27 | Gen Electric | Method of production of a dispenser cathode |
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