EP 0393841 A1 19901024 - Tamper evident envelope.
Title (en)
Tamper evident envelope.
Title (de)
Sicherheits-Briefumschlag.
Title (fr)
Enveloppe inviolable.
Publication
Application
Priority
US 33970489 A 19890418
Abstract (en)
A tamper evident envelope (21) comprises a see-through appendage (29) which is secured, as at (28), to an upper portion of a rear panel (23) of the envelope (21). The appendage (29) is provided with a hot melt adhesive (31, 32) whereby, when the appendage (29) is folded onto a front panel (22) of the envelope (21) and pressed into contact therewith, the appendage (29) seals the envelope (21) in a closed condition. However, the adhesive (31, 32) is arranged to extend beyond upper transverse edges of the panels (22, 23) and must be fractured to gain access to the envelope (21). Therefore, if the envelope (21) is re-sealed, the adhesive (31, 32) cannot be perfectly re-positioned without distortion and this will be visible through the appendage (29).
IPC 1-7
IPC 8 full level
B65D 27/30 (2006.01); B65D 33/16 (2006.01)
CPC (source: EP)
B65D 27/30 (2013.01); B65D 33/1691 (2013.01)
Citation (search report)
- [X] AU 523051 B2 19820708 - ARVEY CORP
- [Y] GB 1536784 A 19781220 - JENNINGS AB
- [Y] DE 1486340 A1 19690417 - FELDMUEHLE AG
- [Y] US 2181252 A 19391128 - MAX VOGEL
- [Y] US 4483018 A 19841113 - WHELAN JOHN W [US]
- [Y] EP 0259068 A1 19880309 - MARDON WRAPPINGS LTD [GB]
Designated contracting state (EPC)
BE CH DE FR GB IT LI NL SE
DOCDB simple family (publication)
EP 0393841 A1 19901024; EP 0393841 B1 19930818; CA 1329176 C 19940503; DE 69002788 D1 19930923
DOCDB simple family (application)
EP 90302862 A 19900316; CA 614774 A 19890929; DE 69002788 T 19900316