US525007A - Manufacture of carbon filaments - Google Patents
Manufacture of carbon filaments Download PDFInfo
- Publication number
- US525007A US525007A US525007DA US525007A US 525007 A US525007 A US 525007A US 525007D A US525007D A US 525007DA US 525007 A US525007 A US 525007A
- Authority
- US
- United States
- Prior art keywords
- filaments
- manufacture
- carbonizable
- filament
- carbon filaments
- 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
- 238000004519 manufacturing process Methods 0.000 title description 5
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title description 3
- 229910052799 carbon Inorganic materials 0.000 title description 3
- UHOVQNZJYSORNB-UHFFFAOYSA-N Benzene Chemical compound C1=CC=CC=C1 UHOVQNZJYSORNB-UHFFFAOYSA-N 0.000 description 6
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 6
- 239000004327 boric acid Substances 0.000 description 6
- 239000000126 substance Substances 0.000 description 6
- RSWGJHLUYNHPMX-UHFFFAOYSA-N Abietic-Saeure Natural products C12CCC(C(C)C)=CC2=CCC2C1(C)CCCC2(C)C(O)=O RSWGJHLUYNHPMX-UHFFFAOYSA-N 0.000 description 3
- KHPCPRHQVVSZAH-HUOMCSJISA-N Rosin Natural products O(C/C=C/c1ccccc1)[C@H]1[C@H](O)[C@@H](O)[C@@H](O)[C@@H](CO)O1 KHPCPRHQVVSZAH-HUOMCSJISA-N 0.000 description 3
- 238000010000 carbonizing Methods 0.000 description 3
- 239000011248 coating agent Substances 0.000 description 3
- 238000000576 coating method Methods 0.000 description 3
- 239000004020 conductor Substances 0.000 description 3
- KHPCPRHQVVSZAH-UHFFFAOYSA-N trans-cinnamyl beta-D-glucopyranoside Natural products OC1C(O)C(O)C(CO)OC1OCC=CC1=CC=CC=C1 KHPCPRHQVVSZAH-UHFFFAOYSA-N 0.000 description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 239000000463 material Substances 0.000 description 2
- 239000002904 solvent Substances 0.000 description 2
- 244000215068 Acacia senegal Species 0.000 description 1
- 241000416162 Astragalus gummifer Species 0.000 description 1
- 229920001353 Dextrin Polymers 0.000 description 1
- 240000004670 Glycyrrhiza echinata Species 0.000 description 1
- 235000001453 Glycyrrhiza echinata Nutrition 0.000 description 1
- 235000006200 Glycyrrhiza glabra Nutrition 0.000 description 1
- 235000017382 Glycyrrhiza lepidota Nutrition 0.000 description 1
- 229920000084 Gum arabic Polymers 0.000 description 1
- 241000779819 Syncarpia glomulifera Species 0.000 description 1
- 229920001615 Tragacanth Polymers 0.000 description 1
- 235000010489 acacia gum Nutrition 0.000 description 1
- 239000000205 acacia gum Substances 0.000 description 1
- FYGDTMLNYKFZSV-MRCIVHHJSA-N dextrin Chemical compound O[C@@H]1[C@@H](O)[C@H](O)[C@@H](CO)OC1O[C@@H]1[C@@H](CO)OC(O[C@@H]2[C@H](O[C@H](O)[C@H](O)[C@H]2O)CO)[C@H](O)[C@H]1O FYGDTMLNYKFZSV-MRCIVHHJSA-N 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 229940010454 licorice Drugs 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000001739 pinus spp. Substances 0.000 description 1
- 235000015096 spirit Nutrition 0.000 description 1
- 229940036248 turpentine Drugs 0.000 description 1
Images
Classifications
-
- D—TEXTILES; PAPER
- D01—NATURAL OR MAN-MADE THREADS OR FIBRES; SPINNING
- D01F—CHEMICAL FEATURES IN THE MANUFACTURE OF ARTIFICIAL FILAMENTS, THREADS, FIBRES, BRISTLES OR RIBBONS; APPARATUS SPECIALLY ADAPTED FOR THE MANUFACTURE OF CARBON FILAMENTS
- D01F9/00—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments
- D01F9/08—Artificial filaments or the like of other substances; Manufacture thereof; Apparatus specially adapted for the manufacture of carbon filaments of inorganic material
- D01F9/12—Carbon filaments; Apparatus specially adapted for the manufacture thereof
- D01F9/14—Carbon filaments; Apparatus specially adapted for the manufacture thereof by decomposition of organic filaments
- D01F9/145—Carbon filaments; Apparatus specially adapted for the manufacture thereof by decomposition of organic filaments from pitch or distillation residues
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
- Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
- Y10T29/00—Metal working
- Y10T29/30—Foil or other thin sheet-metal making or treating
- Y10T29/301—Method
- Y10T29/303—Method with assembling or disassembling of a pack
- Y10T29/304—Using transitory solid cover material
Definitions
- the object of my invention is to produce incandescent conductors for electric lamps which shall be of even texture or structure throughout and of high electrical resistance.
- I first form I a filament of a substance which is readily soluble by solvents which do not affect the carbonizable substance which is to be placed thereon.
- I may take boric acid which when heated may be readily drawn out into smooth cylindrical filaments and such filaments I then prefer to bend into the arched or looped form which I have found to be preferable for incandescentconductors.
- I then coat such filaments with several concentric layers of carbonizable material which I preferably accomplish by immersing thexnin a solution of asphaltine dissolved in benzole, allowing the coating to dry, which it does quickly, then again immersing and drying, and repeating these steps as many times as desired.
- Each layer may be made very thin, the thickness depending on the strength of the solutiom
- the filament may be placed in water which will dissolve the base of boric acid'without affecting the carbonizable substance.
- Such filaments are carbonized in the usual or any suitable manner.
- the benzole which is the solvent for the asphaltine being volatile is rapidly removed by the carbonizing heat.
- Being hollow their electrical resistance is highand they therefore may be used with unusual economy in the amount of metal required for the conductors supplying current to them.
- Another way of forming filaments of this character is to take tubes of boric acid and draw the asphaltine or other carbonizable solution through them at intervals whereby successive "layers are formed on the inside of the tube.
- boric acid can then be very readily dissolved, the result being as before a hollow carbonizable filament composed of concentric layers.
- boric acid and asphaltine as suitable substances but it is evident that many others may be used without departing from the principle of my invention.
- I may employ melted rosin, which may be drawn into filaments and these coated concentrically with layers of licorice dissolved into gum dextrine, gum arabic or gum tragacanth, and the rosin may then be dissolved out by spirits of turpentine. If rosin is used however it need not be dissolved out for it is itself carbonizable. I prefor to dissolve it however, so as to form hollow filaments.
- Figure 1 is an exaggerated section of a filament before the removal of the soluble base;
- Fig. 2 a similar section before the removal of the soluble tubular base;
- Fig. 3 a similar section of the completed carbonizable filament;
- Fig. 4 an enlarged view in elevation of the same.
- a soluble base On a soluble base a are placed successive layers b b of carbonizable substance; in Fig. 2, a soluble tube "0 has its interior coated with such layers; Fig. 3 shows either form with the soluble filament or tube removed, the concentric layers b remaining.
- What I claim is- 1.
- the method of making filaments for in candescent electric lamps which consists in forming a core of a substance soluble in water, coating the core with one or more layers of carbonizable materiahdissolving the core in water and finally carbonizing the hollow filament, substantially as described.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Textile Engineering (AREA)
- Inorganic Fibers (AREA)
Description
Patented Aug. 28, 1894.
Saleem/'0': Lq'ers afdrrbomlwA/e Mr/JJI. Z---%- Soluble Base.
(No Model) T. A. EDISON. MANUFACTURE OF CARBON PILAMENTS.
PATENT OFFICE.
THOMAS A. EDISON, OF LLEWELLYN PARK, NEW JERSEY.
MANUFACTURE OF CARBON FILAMENTS.
SPECIFICATION forming part of Letters Patent No. 525,007, dated August 28, 1894. 7 Application filed December 15, 1886- SerialNo. 221,583. (No model.)
To all whom it may concern.-
Be it known that I, THOMAS A. EDIsoN, of Llewellyn Park, in the county of Essex and State of New Jersey, have invented a certain new and useful Improvement in the Manufacture of Carbon Filaments, (OaseNo. 707,) of which the following is a specification.
The object of my invention is to produce incandescent conductors for electric lamps which shall be of even texture or structure throughout and of high electrical resistance.
In accomplishing my invention I first form I a filament of a substance which is readily soluble by solvents which do not affect the carbonizable substance which is to be placed thereon. For instance I may take boric acid which when heated may be readily drawn out into smooth cylindrical filaments and such filaments I then prefer to bend into the arched or looped form which I have found to be preferable for incandescentconductors. I then coat such filaments with several concentric layers of carbonizable material which I preferably accomplish by immersing thexnin a solution of asphaltine dissolved in benzole, allowing the coating to dry, which it does quickly, then again immersing and drying, and repeating these steps as many times as desired. Each layer may be made very thin, the thickness depending on the strength of the solutiom After the desired thickness of carbonizable material is obtained-which may depend on the resistance desired for the conductor, the filament may be placed in water which will dissolve the base of boric acid'without affecting the carbonizable substance. This forms a hollow filament composed of numerous concentric layers. Such filaments are carbonized in the usual or any suitable manner. The benzole which is the solvent for the asphaltine being volatile is rapidly removed by the carbonizing heat. Being hollow their electrical resistance is highand they therefore may be used with unusual economy in the amount of metal required for the conductors supplying current to them. Another way of forming filaments of this character is to take tubes of boric acid and draw the asphaltine or other carbonizable solution through them at intervals whereby successive "layers are formed on the inside of the tube.
The boric acid can then be very readily dissolved, the result being as before a hollow carbonizable filament composed of concentric layers. I have mentioned boric acid and asphaltine as suitable substances but it is evident that many others may be used without departing from the principle of my invention. As another instance, I may employ melted rosin, which may be drawn into filaments and these coated concentrically with layers of licorice dissolved into gum dextrine, gum arabic or gum tragacanth, and the rosin may then be dissolved out by spirits of turpentine. If rosin is used however it need not be dissolved out for it is itself carbonizable. I prefor to dissolve it however, so as to form hollow filaments.
In the accompanying drawings, Figure 1, is an exaggerated section of a filament before the removal of the soluble base; Fig. 2, a similar section before the removal of the soluble tubular base; Fig. 3, a similar section of the completed carbonizable filament; and Fig. 4, an enlarged view in elevation of the same.
In Fig. 1, on a soluble base a are placed successive layers b b of carbonizable substance; in Fig. 2, a soluble tube "0 has its interior coated with such layers; Fig. 3 shows either form with the soluble filament or tube removed, the concentric layers b remaining.
What I claim is- 1. The method of making filaments for in candescent electric lamps which consists in forming a core of a substance soluble in water, coating the core with one or more layers of carbonizable materiahdissolving the core in water and finally carbonizing the hollow filament, substantially as described.
2. The method of making filaments for incandescent electric lamps which consists in forming a core of boric acid, coating the core with a solution of asphaltine in benzole, dissolving the core and finally carbonizing the hollow filament, substantially as described.
This specification signed and witnessed this 6th day of December, 1886.
THOS. A. EDISON.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US525007A true US525007A (en) | 1894-08-28 |
Family
ID=2593800
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US525007D Expired - Lifetime US525007A (en) | Manufacture of carbon filaments |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US525007A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4107384A (en) * | 1976-08-10 | 1978-08-15 | Mitsubishi Rayon Co., Ltd. | Method for producing porous fibers |
-
0
- US US525007D patent/US525007A/en not_active Expired - Lifetime
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4107384A (en) * | 1976-08-10 | 1978-08-15 | Mitsubishi Rayon Co., Ltd. | Method for producing porous fibers |
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