US430933A - Thomas a - Google Patents
Thomas a Download PDFInfo
- Publication number
- US430933A US430933A US430933DA US430933A US 430933 A US430933 A US 430933A US 430933D A US430933D A US 430933DA US 430933 A US430933 A US 430933A
- Authority
- US
- United States
- Prior art keywords
- filament
- hollow
- thomas
- incandescing
- edison
- 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 - Lifetime
Links
- OKTJSMMVPCPJKN-UHFFFAOYSA-N carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 10
- 229910052799 carbon Inorganic materials 0.000 description 10
- 239000004020 conductor Substances 0.000 description 10
- 239000002184 metal Substances 0.000 description 10
- 229920002678 cellulose Polymers 0.000 description 8
- 239000001913 cellulose Substances 0.000 description 8
- 239000000463 material Substances 0.000 description 8
- 238000003763 carbonization Methods 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- KRHYYFGTRYWZRS-UHFFFAOYSA-N HF Chemical compound F KRHYYFGTRYWZRS-UHFFFAOYSA-N 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 229920002160 Celluloid Polymers 0.000 description 2
- 229920001131 Pulp (paper) Polymers 0.000 description 2
- 239000002253 acid Substances 0.000 description 2
- 238000010000 carbonizing Methods 0.000 description 2
- 239000011248 coating agent Substances 0.000 description 2
- 238000000576 coating method Methods 0.000 description 2
- 230000003247 decreasing Effects 0.000 description 2
- 239000000835 fiber Substances 0.000 description 2
- 239000011339 hard pitch Substances 0.000 description 2
- 239000011347 resin Substances 0.000 description 2
- 229920005989 resin Polymers 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 210000001519 tissues Anatomy 0.000 description 2
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
- H01J1/00—Details of electrodes, of magnetic control means, of screens, or of the mounting or spacing thereof, common to two or more basic types of discharge tubes or lamps
- H01J1/02—Main electrodes
- H01J1/13—Solid thermionic cathodes
- H01J1/15—Cathodes heated directly by an electric current
Definitions
- the object I have in view is to produce incandescing conductors for electric lamps which shall be of high resistance and at the same time have small radiatingsurface.
- the material which is coated with the carbonizable substance may be metal which can be withdrawn or eaten out by acid; or filaments formed of resins, hard pitch, or celluloid may be used, which can be dissolved by suitable solvents.
- the wires or filaments may be wrapped with tissue or other paper orcoated with paper-pulp or cellulose.
- a metal wire may be coated with cellulose and such cellulose gelatinized by hydrofluoric acid, the metal being removed in any suitable way.
- ⁇ Vhere metal is used as the base of the filament, it might be allowed to remain until carbonization, when the heat required to carbonize will fuse the metal and cause it to run out, leaving the carbon filament hollow. After carbonization,
- A is the filament, having enlarged ends a a,
- the filament being hollow throughout its length, as seen in Fig. 2.
- a tubular filament of carbonizable material for forming the incandescing conductor of an electric lamp substantially as set forth.
- a tubular flexible carbon filament for the incandescing conductor of an electric lamp substantially as set forth.
- a filament for incandescent electric lamps the entire incandescing portion of which is in the form of a tube, substantially as described.
- a filament for in andescent electric lamps the incandescing portion of which is in the form of a tubular arch, substantially as described.
Landscapes
- Prostheses (AREA)
Description
(No Model.)
T. A. EDISON. FILAMENT FOR INUA NDESUENT LAMPS.
No. 430,933. Patented June 24, 1890.
INVENTD R1:
.A'TTEST:
UNITED STATES PATENT OFFICE.
THOMAS A. EDISON, OF MENLO PARK, NEWV JERSEY, ASSIGNOR TO THE EDISON ELECTRIC LIGHT COMPANY, OF NEWV YORK, N. Y.
FILAMENT FOR INCAN DESCENT LAM PS.
SPECIFICATION forming part of Letters Patent No. 430,933, dated June 24, 1890.
Application filed November 9, 1882. Serial No. 76,385. (No model.)
To all whom it may concern.-
Be it known that I, THOMAS A. EDISON, of Menlo Park, in the county of Middlesex and State of New Jersey, have invented a new and useful Improvement in Incandescing Conductors for Electric Lamps, (CaseNo. 51-1,) of which the following is a specification.
The object I have in view is to produce incandescing conductors for electric lamps which shall be of high resistance and at the same time have small radiatingsurface. This I accomplish by making such incandescingconductor (which is preferably a flexible carbon filament) hollow, so that its mass is decreased and its resistance consequently raised. To make a hollow flexible filament of carbon, I coat a wire or filament of any suitable material with carbonizable substance, and after pressing to consolidate the fiber of the latter I remove the wire or filament in any suitable way, the result being a hollow flexible filament of carbonizable material, which may be carbonized in the usual manner under pressure or strain, or both, the filament being bent into the desired shape before or after carbonization. The material which is coated with the carbonizable substance may be metal which can be withdrawn or eaten out by acid; or filaments formed of resins, hard pitch, or celluloid may be used, which can be dissolved by suitable solvents. The wires or filaments may be wrapped with tissue or other paper orcoated with paper-pulp or cellulose.
If it is desired to use filaments of gelatinized cellulose, as set forth in my application Serial No. 7 4,7 86, a metal wire may be coated with cellulose and such cellulose gelatinized by hydrofluoric acid, the metal being removed in any suitable way. \Vhere metal is used as the base of the filament, it might be allowed to remain until carbonization, when the heat required to carbonize will fuse the metal and cause it to run out, leaving the carbon filament hollow. After carbonization,
ment formed according to my invention; Fig. 5 5
2, a cross-section of the same, and Fig. 3 a vertical section of an enlarged end made solid. A is the filament, having enlarged ends a a,
which may be either solid, as seen in Fig. 3,
or hollow, the filament being hollow throughout its length, as seen in Fig. 2.
What I claim is V 1. A tubularincandescing conductor for an electric lamp, substantially as set forth.
2. A tubular filament of carbonizable material for forming the incandescing conductor of an electric lamp, substantially as set forth.
3. A tubular flexible carbon filament for the incandescing conductor of an electric lamp, substantially as set forth.
4. The method of forming hollow carbon filaments, consisting in coating a wire or fila ment with a carbonizable substance, removin g such wire or filament, and carbonizing the hollow filament thus formed, substantially as set forth.
5. A filament for incandescent electric lamps the entire incandescing portion of which is in the form of a tube, substantially as described.
6. A filament for in andescent electric lamps the incandescing portion of which is in the form of a tubular arch, substantially as described.
This specifiation signed and witnessed this 3d day of November, 1882.
THOMAS A. EDISON.
Witnesses:
H. W. SEELY, EDWARD I-I. PYATT.
Publications (1)
Publication Number | Publication Date |
---|---|
US430933A true US430933A (en) | 1890-06-24 |
Family
ID=2499839
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US430933D Expired - Lifetime US430933A (en) | Thomas a |
Country Status (1)
Country | Link |
---|---|
US (1) | US430933A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3048726A (en) * | 1959-09-14 | 1962-08-07 | Gen Electric | Electron discharge rectifier |
-
0
- US US430933D patent/US430933A/en not_active Expired - Lifetime
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3048726A (en) * | 1959-09-14 | 1962-08-07 | Gen Electric | Electron discharge rectifier |
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