GB190109904A - Improvements in Envelopes - Google Patents

Improvements in Envelopes

Info

Publication number
GB190109904A
GB190109904A GB190109904DA GB190109904A GB 190109904 A GB190109904 A GB 190109904A GB 190109904D A GB190109904D A GB 190109904DA GB 190109904 A GB190109904 A GB 190109904A
Authority
GB
United Kingdom
Prior art keywords
envelopes
lines
roebelen
colouring
perforations
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
Inventor
Albert Roebelen
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Application granted granted Critical
Publication of GB190109904A publication Critical patent/GB190109904A/en
Expired legal-status Critical Current

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Abstract

9904. Roebelen, A. May 13. Envelopes. - In order to prevent or detect surreptitious opening, one or more lines of perforations b, intersecting at c, are formed in the flap, and lines d are drawn on the envelope with some colouring-matter which is soluble in water.
GB190109904D 1901-05-13 1901-05-13 Improvements in Envelopes Expired GB190109904A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB190109904T 1901-05-13

Publications (1)

Publication Number Publication Date
GB190109904A true GB190109904A (en) 1901-06-15

Family

ID=32151574

Family Applications (1)

Application Number Title Priority Date Filing Date
GB190109904D Expired GB190109904A (en) 1901-05-13 1901-05-13 Improvements in Envelopes

Country Status (1)

Country Link
GB (1) GB190109904A (en)

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