US168467A - Improvement in recording-points for chemical telegraphs - Google Patents

Improvement in recording-points for chemical telegraphs Download PDF

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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
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recording
improvement
points
chemical
telegraphs
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    • 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

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  • Developing Agents For Electrophotography (AREA)
  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Ink Jet Recording Methods And Recording Media Thereof (AREA)

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.
US168467D Improvement in recording-points for chemical telegraphs Expired - Lifetime US168467A (en)

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