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

Improvement in recording-points for chemical telegraphs Download PDF

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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
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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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  • Optical Record Carriers And Manufacture Thereof (AREA)
  • Ink Jet Recording Methods And Recording Media Thereof (AREA)
  • Developing Agents For Electrophotography (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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US168467A true US168467A (en) 1875-10-05

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