Watertight note card assembly
US5087079A · kind A · utility
Inventor
Key dates
| Filing date | Aug 29, 1990 |
| Grant date | Feb 11, 1992 |
| Priority date | — |
| Expiry date | Aug 29, 2010 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63B2102/32
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
Disclosed is a note card assembly that is watertight, yet accessible to remove a completed note card. In one embodiment the assembly has a generally rectangular shape in plan view and comprises a watertight envelope having an interior pocket defined by permanent seals on three sides and a resealable seal on the fourth side. A subassembly inside the pocket includes a layered sandwich of a rigid writing board, a note card having a CF coated top surface, and a transparent sheet having a CB coated bottom surface in contact with the top surface of the note card. When pressure is applied to the outer envelope, a chemical reaction takes place between the two coated layers leaving a permanent marking on the top surface of the note card.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.