Improved wrapper paper for use in very low contact pressure applications
US5250348A · kind A · utility
16Cited by
11References
7Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 22, 1992 |
| Grant date | Oct 5, 1993 |
| Priority date | — |
| Expiry date | Oct 22, 2012 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31993
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A wrapper paper for pressure sensitive products bearing on one of its flat surfaces a layer of polyethylene and on the opposite of its flat surfaces a layer of a primer selected from the polyalkyleneimine class, at least portions of the opposite flat coated surfaces facing one another in overlapping relationship when the paper is wrapped about a product, the overlying areas of the wrapper paper being sealed to one another by heat means and the application of very low pressure to the overlapping portions.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.