US524172A - Variable-resistance medium for telephones - Google Patents
Variable-resistance medium for telephones Download PDFInfo
- Publication number
- US524172A US524172A US524172DA US524172A US 524172 A US524172 A US 524172A US 524172D A US524172D A US 524172DA US 524172 A US524172 A US 524172A
- Authority
- US
- United States
- Prior art keywords
- variable
- telephones
- resistance medium
- william
- boron
- 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
- ZOXJGFHDIHLPTG-UHFFFAOYSA-N Boron Chemical compound [B] ZOXJGFHDIHLPTG-UHFFFAOYSA-N 0.000 description 4
- 229910052796 boron Inorganic materials 0.000 description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical compound C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 description 3
- ZLMJMSJWJFRBEC-UHFFFAOYSA-N Potassium Chemical compound [K] ZLMJMSJWJFRBEC-UHFFFAOYSA-N 0.000 description 3
- 238000010438 heat treatment Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 229910052700 potassium Inorganic materials 0.000 description 3
- 239000011591 potassium Substances 0.000 description 3
- 229910052708 sodium Inorganic materials 0.000 description 3
- 239000011734 sodium Substances 0.000 description 3
- KGBXLFKZBHKPEV-UHFFFAOYSA-N boric acid Chemical compound OB(O)O KGBXLFKZBHKPEV-UHFFFAOYSA-N 0.000 description 2
- 229960002645 boric acid Drugs 0.000 description 2
- 235000010338 boric acid Nutrition 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 150000003839 salts Chemical class 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C01—INORGANIC CHEMISTRY
- C01B—NON-METALLIC ELEMENTS; COMPOUNDS THEREOF; METALLOIDS OR COMPOUNDS THEREOF NOT COVERED BY SUBCLASS C01C
- C01B35/00—Boron; Compounds thereof
- C01B35/02—Boron; Borides
- C01B35/023—Boron
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Battery Electrode And Active Subsutance (AREA)
Description
.UNITED'USTATES. PATENT OFFICE.
WILLIAM W. JACQUES, OF NEWTON, ASSIGNOR 'ro THE AMERICAN BELL TELEPHONE COMPANY, OF BOSTON, MASSACHUSETTS.
VARIABLE-RESlSTA NCE MEDIUM FOR TELEPHONE'S.
SPECIFICATION forming part of Letters Patent No. 524,172, dated August '7, 1894. I Application filed May 14, 1894:. Serial No. 511,239. (No specimens.)
Toall whom it may concern:
Be it known that 1, WILLIAM W. JACQUES, of'Newton, in the State of Massachusetts,have invented a new and useful Variable-Resistance Medium for Use between the Electrodes of Battery-Telephone Transmitters, of which 7 The'process consists in reducing a salt of boron by heating it with sodium or potassium and again heating the product .to a white heat in the absence of air..-
I take boracic acid and fuse it at-a white heat until it assumes the appearance of agate. I
then .pulverize it and mix it with metallic sodium or potassium in proper proportions to reduce the boracic acid. The mixture is then heated in a closed vessel, care being taken to prevent the access of air. After cooling, the
mixture is dissolved in water and filtered,
thus producing amorphous boron. This when dried at a reddish white heat in the absence of air produces electric and microphonic boron in granular condition. The grains form an ex- 2. The herein described process of producing a variable resistance medium for battery telephones consisting in reducing a salt of boron by heating it with sodium or potassium, and againheating the product to a white heat in the absence of air.
Witnesses:
WILLIAM W. SWAN, WILLIAM SUL IVAN.
WILLIAM W. JACQUES.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US524172A true US524172A (en) | 1894-08-07 |
Family
ID=2592967
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US524172D Expired - Lifetime US524172A (en) | Variable-resistance medium for telephones |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US524172A (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2697136A (en) * | 1951-04-28 | 1954-12-14 | Bell Telephone Labor Inc | Microphone and microphone granules |
| US2956862A (en) * | 1956-06-01 | 1960-10-18 | Nat Distillers Chem Corp | Process for reduction of chemical compounds |
-
0
- US US524172D patent/US524172A/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2697136A (en) * | 1951-04-28 | 1954-12-14 | Bell Telephone Labor Inc | Microphone and microphone granules |
| US2956862A (en) * | 1956-06-01 | 1960-10-18 | Nat Distillers Chem Corp | Process for reduction of chemical compounds |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN101503798B (en) | Anti-tarnish protectant composition for silver plating | |
| US524172A (en) | Variable-resistance medium for telephones | |
| US524173A (en) | Variable-resistance medium for telephones | |
| US2137144A (en) | Process for the production of metal carbides | |
| US1501419A (en) | Process of producing boron carbide | |
| US422334A (en) | Xtheodor g gurtius | |
| US1733695A (en) | Process for the preparation of alpha-hydrazino-beta-nitro-pyridine | |
| US1019377A (en) | Heat-producing compound. | |
| US570014A (en) | Metallic alloy or compound and process of producing same | |
| US1133019A (en) | Process of making alloys. | |
| US581391A (en) | Process of recovering flocculent carbon | |
| US1212062A (en) | Process for the production of cuprous oxid electrolytically. | |
| US1967789A (en) | Chromium plating bath and method of making same | |
| US130353A (en) | Improvement in galvanic batteries | |
| US1169392A (en) | Composition of copper alloys and process of manufacturing the same. | |
| CN110698792B (en) | Preparation method of sterile PVC (polyvinyl chloride) membrane with stable performance at high temperature | |
| US1179051A (en) | Process for producing ethylene from acetylene. | |
| US618635A (en) | Arthur reginald adams | |
| US913657A (en) | Solution for treatment of iron or steel. | |
| GB108916A (en) | Improvements in Solder or the like and the Process of Preparing the same. | |
| US495090A (en) | Granulated material for transmittxng-telephones | |
| US1372423A (en) | Process of case-hardening copper | |
| King | Low-temperature Heat Capacities and Entropies at 298.15° K. of Crystalline Lead Metasilicate, Lead Orthosilicate and Cadmium Metasilicate | |
| US1258886A (en) | Composition of copper alloys containing strontium. | |
| US1358870A (en) | Paint |