Sheet material
US4481252A · kind A · utility
7Cited by
8References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 19, 1982 |
| Grant date | Nov 6, 1984 |
| Priority date | — |
| Expiry date | Nov 19, 2002 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/31801
- WIPO fieldTextile and paper machines
- WIPO sectorMechanical engineering
Abstract
A transparent sheet material which is suitable for projection on overhead projectors comprises coated onto a support a binder layer containing discrete particles of an organic polymer which has substantially the same refractive index as the binder, the polymer comprising from 0.5 to 30% by weight of the binder. The coating gives a good key for typewritten characters produced by carbon ribbon or ink ribbon typewriters, for writing with e.g. ball-point pen, pencil, water or solvent based ink pens, Indian ink and inked rubber stamps.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.