Non-migrating control indicia for a plastic web or sheet article
US4467207A · kind A · utility
29Cited by
7References
12Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jul 1, 1982 |
| Grant date | Aug 21, 1984 |
| Priority date | — |
| Expiry date | Jul 1, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/8305
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
An article in web or sheet form, especially useful in the packaging or container art, having control indicia. The indicia are detectable under special conditions for controlling operations in the manufacture and/or use of the article. In the preferred embodiment the indicia are invisible and of a polar or ionic organic material that will not significantly migrate through a plastic web. The indicia emit electromagnetic wavelength-shifted radiation in response to incident electromagnetic radiation of a selected wavelength.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.