GB1186308A - Incandescent Lamp with Tantalum Carbide Filament and Nitrogen Gas Atmosphere. - Google Patents
Incandescent Lamp with Tantalum Carbide Filament and Nitrogen Gas Atmosphere.Info
- Publication number
- GB1186308A GB1186308A GB54594/68A GB5459468A GB1186308A GB 1186308 A GB1186308 A GB 1186308A GB 54594/68 A GB54594/68 A GB 54594/68A GB 5459468 A GB5459468 A GB 5459468A GB 1186308 A GB1186308 A GB 1186308A
- Authority
- GB
- United Kingdom
- Prior art keywords
- filament
- incandescent lamp
- reflector
- lamp
- tantalum
- 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
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01K—ELECTRIC INCANDESCENT LAMPS
- H01K7/00—Lamps for purposes other than general lighting
- H01K7/02—Lamps for purposes other than general lighting for producing a narrow beam of light; for approximating a point-like source of light, e.g. for searchlight, for cinematographic projector
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01K—ELECTRIC INCANDESCENT LAMPS
- H01K1/00—Details
- H01K1/26—Screens; Filters
-
- 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
1,186,308. Electric incandescent lamp. WESTINGHOUSE ELECTRIC CORP. 18 Nov., 1968 [18 Jan., 1968], No. 54594/68. Heading H1F. An electric incandescent lamp comprises a filament comprising stoichiometric tantalum carbide and a gaseous filling of 0À4 to 100 vol. per cent of N 2 , any additional gas filling being an inert gas. The filament may also comprise 0À05-0À5 wt. per cent of chemically bound nitrogen, or contain Ti, Th, V, Nb, Mo, W, U, Zr or Hf as additives or be a mixture of tungsten and tantalum carbides. The additives are incorporated in the filament before carbiding the filament. The nitrogen atmosphere is said to be reactive with the carbide filament in such a way as to preserve its stoichiometry. The atmosphere may also contain argon. The lamp is exemplified as a projection lamp, three examples of which have an internal reflector. In one embodiment, the reflector is dichroic to reflect visible light but transmit I.R. (Fig. 4, not shown), whilst in another the reflector is made of molybdenum and situated close to the filament so that it becomes incandescent with the filament (Fig. 5, not shown). The ends of the filament are wrapped about a tantalum rod (26) prior to carbiding and then joined to the leadins (Fig. 2, not shown). In another embodiment, the filament is supported in bifurcated arms (Fig. 3, not shown).
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US69896368A | 1968-01-18 | 1968-01-18 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1186308A true GB1186308A (en) | 1970-04-02 |
Family
ID=24807352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB54594/68A Expired GB1186308A (en) | 1968-01-18 | 1968-11-18 | Incandescent Lamp with Tantalum Carbide Filament and Nitrogen Gas Atmosphere. |
Country Status (3)
| Country | Link |
|---|---|
| US (1) | US3523207A (en) |
| ES (1) | ES361377A1 (en) |
| GB (1) | GB1186308A (en) |
Families Citing this family (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1296224A (en) * | 1969-01-22 | 1972-11-15 | ||
| US4924134A (en) * | 1988-08-15 | 1990-05-08 | Gte Products Corporation | Internal lamp reflector |
| US4964829A (en) * | 1988-08-15 | 1990-10-23 | Gte Products Corporation | Internal lamp reflector |
| FR2687252A1 (en) * | 1992-02-12 | 1993-08-13 | Dilouya Gilbert | Optical system comprising a lamp with incorporated reflector |
| GB2428878A (en) * | 2005-07-25 | 2007-02-07 | Gen Electric | Light source for high efficiency illumination systems |
| DE102005057084A1 (en) * | 2005-11-30 | 2007-05-31 | Patent-Treuhand-Gesellschaft für elektrische Glühlampen mbH | Incandescent filament with melting point exceeding that of tungsten, used in quartz halogen bulb, contains metal carbide in which carbon content is sub-stoichiometric |
| US7385338B1 (en) * | 2006-12-21 | 2008-06-10 | Osram Sylvania Inc. | Cylindrical lamp employing internal reflector |
| US20080237541A1 (en) * | 2007-03-30 | 2008-10-02 | General Electric Company | Thermo-optically functional compositions, systems and methods of making |
| US8278823B2 (en) * | 2007-03-30 | 2012-10-02 | General Electric Company | Thermo-optically functional compositions, systems and methods of making |
| US20080237500A1 (en) * | 2007-03-30 | 2008-10-02 | General Electric Company | Thermo-optically functional compositions, systems and methods of making |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2928977A (en) * | 1958-12-19 | 1960-03-15 | Gen Electric | Incandescent lamp |
| US3082345A (en) * | 1960-04-28 | 1963-03-19 | Westinghouse Electric Corp | Electric lamp |
| US3194626A (en) * | 1961-12-05 | 1965-07-13 | Westinghouse Electric Corp | Method of aligning a reflector and a light source |
| US3331980A (en) * | 1963-11-21 | 1967-07-18 | Westinghouse Electric Corp | Projection lamp having resilient support means for dichroic reflector |
| US3411959A (en) * | 1966-03-21 | 1968-11-19 | Westinghouse Electric Corp | Method for producing tantalum carbide and tantalum-alloy carbide filaments |
-
1968
- 1968-01-18 US US698963A patent/US3523207A/en not_active Expired - Lifetime
- 1968-11-18 GB GB54594/68A patent/GB1186308A/en not_active Expired
- 1968-12-13 ES ES361377A patent/ES361377A1/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| ES361377A1 (en) | 1970-11-01 |
| US3523207A (en) | 1970-08-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PLNP | Patent lapsed through nonpayment of renewal fees |