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US 4,557,505 AGranted
Stress-opacifying tamper indicating tape
AssigneeMinnesota Mining and Manufacturing Company
InventorsRichard M. Schaefer, James J. Tome
Life of this patent
Estimating the term…
Abstract
A tape product which bears a visible message which is changed when the tape is subjected to stress is adapted for use on containers and packages to indicate that the same container or package has been opened or the closure has been tampered with in an attempt to open the same. The message change is obtained by the tape becoming opaque to obliterate one message and provide a contrasting background for a different message.
Claims20
A stress-opacifying tamper indicating tape for use on closures comprising:
- a stress-opacifying translucent polymeric backing having an exposed surface,
- printed indicium on said exposed surface of a translucent colored ink material,
- contrasting indicium on the opposite surface of said backing of contrasting colored ink material and a coating in the background area of said contrasting indicium on said opposite surface, said background coating being of a color substantially similar to the color of said printed indicium,
- whereby said contrasting indicium of contrasting color is visible from said exposed side of said backing until said backing is subjected to stress sufficient to opacify said backing and obliterate said contrasting indicium and said background coating to enhance the visibility of said printed indicium.
1 more element
A stress-opacifying tamper indicating tape comprising:
- a stress-opacifying translucent polymeric backing having an exposed surface,
- printed indicium on said exposed surface of a translucent colored ink material,
- contrasting indicium adhered on the opposite surface of said backing in register with said printed indicium or said exposed face, said contrasting indicium being a darker color ink material than said translucent colored ink material, and
- a coating in the background area of said contrasting indicium on said opposite surface, said background coating being of a color substantially similar to the color of said printed indicium,
- whereby said contrasting indicium of contrasting color is visible from said exposed side of said backing until said backing is subjected to stress sufficient to opacify said backing and obliterate said contrasting indicium and said background coating to enhance the visibility of said printed indicium.
2 more elements
Dependencies are inferred from the claim text.