GB494224A - Improvements in or relating to methods of and means for producing visible marks on a recording surface - Google Patents

Improvements in or relating to methods of and means for producing visible marks on a recording surface

Info

Publication number
GB494224A
GB494224A GB2261638A GB2261638A GB494224A GB 494224 A GB494224 A GB 494224A GB 2261638 A GB2261638 A GB 2261638A GB 2261638 A GB2261638 A GB 2261638A GB 494224 A GB494224 A GB 494224A
Authority
GB
United Kingdom
Prior art keywords
relating
methods
blank
recording surface
paper
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
Application number
GB2261638A
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Western Union Telegraph Co
Original Assignee
Western Union Telegraph Co
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Western Union Telegraph Co filed Critical Western Union Telegraph Co
Publication of GB494224A publication Critical patent/GB494224A/en
Expired legal-status Critical Current

Links

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

Landscapes

  • Color Printing (AREA)

Abstract

494,224. Copying-telegraphy ; paper for recording signals. STEVENS, A. H. (Western Union Telegraph Co.) Jan. 18, 1937, No. 22616/38. Divided out of 494,143 under which a Specification was laid open to inspection under Sect. 91 of the Acts, July 19, 1937. [Class 40 (iii)] [Also in Groups VIII and XIX] A blank for recording electric signals comprises a support, e.g. paper, made conductive during manufacture, e.g. by impregnation with carbon, and carries a substance which changes colour upon application of electric signals, e.g. lead thiosulphate or thiocyanate, or mercuric sulphide, iodide or oxide. The blank is used in a dry state. Specification 494,143 is referred to.
GB2261638A 1937-01-18 1937-01-18 Improvements in or relating to methods of and means for producing visible marks on a recording surface Expired GB494224A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB2261637 1937-01-18

Publications (1)

Publication Number Publication Date
GB494224A true GB494224A (en) 1938-10-18

Family

ID=10182323

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2261638A Expired GB494224A (en) 1937-01-18 1937-01-18 Improvements in or relating to methods of and means for producing visible marks on a recording surface

Country Status (1)

Country Link
GB (1) GB494224A (en)

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