Envelope opening process and composition
US4228634A · kind A · utility
1Cited by
6References
8Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Aug 13, 1979 |
| Grant date | Oct 21, 1980 |
| Priority date | — |
| Expiry date | Aug 13, 1999 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB43M7/004
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
In an envelope opening process in which an aqueous solution of a chemical degradation agent, such as tartaric acid is applied to envelope edges and the envelope edges are then heated and subjected to a mild mechanical action, penetration of the degradation agent through the envelope paper at its edges is assured by including in the aqueous solution from 2.5% to 30% of a glycol ether, such as ethylene glycol ethyl ether.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.