US168467A - Improvement in recording-points for chemical telegraphs - Google Patents
Improvement in recording-points for chemical telegraphs Download PDFInfo
- Publication number
- US168467A US168467A US168467DA US168467A US 168467 A US168467 A US 168467A US 168467D A US168467D A US 168467DA US 168467 A US168467 A US 168467A
- Authority
- US
- United States
- Prior art keywords
- recording
- improvement
- points
- chemical
- telegraphs
- 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
- 239000000126 substance Substances 0.000 title description 4
- MYMOFIZGZYHOMD-UHFFFAOYSA-N oxygen Chemical compound O=O MYMOFIZGZYHOMD-UHFFFAOYSA-N 0.000 description 2
- 229910052760 oxygen Inorganic materials 0.000 description 2
- 239000001301 oxygen Substances 0.000 description 2
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B41—PRINTING; LINING MACHINES; TYPEWRITERS; STAMPS
- B41M—PRINTING, DUPLICATING, MARKING, OR COPYING PROCESSES; COLOUR PRINTING
- B41M5/00—Duplicating or marking methods; Sheet materials for use therein
- B41M5/20—Duplicating or marking methods; Sheet materials for use therein using electric current
Description
UNITED STATES PATENT OFFICE.
THOMAS A. EDISON, NEWARK, NEW JERSEY, ASSIGNOR TO HIMSELF AND GEORGE HARRINGTON, OF WASHINGTON, DISTRICT OF COLUMBIA.
IMPROVEMENT IN RECORDING-POINTS FOR CHEMICAL TELEGRAPHS.
Specification forming part of Letters Patent No. 168,467., dated October 5, 1875; application filed January 26, 1875.
CASE 105.
is of extreme delicacy, the marks being due probably to the finely-divided oxide of ruthinium formed by the electrolytic oxygen.
I claim Areoording-point formed of metallic ruthinium in a chemical telegraph, substantially as set forth.
Signed by me this 18th day of January, A. D. 1875.
THOS. A. EDISON.
Witnesses:
GEO. T. PINOKNEY, CHAS. H. SMITH.
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US168467A true US168467A (en) | 1875-10-05 |
Family
ID=2237876
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US168467D Expired - Lifetime US168467A (en) | Improvement in recording-points for chemical telegraphs |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US168467A (en) |
-
0
- US US168467D patent/US168467A/en not_active Expired - Lifetime
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