Element and method for teaching with liquid crystals
US4038761A · kind A · utility
3Cited by
9References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Feb 17, 1976 |
| Grant date | Aug 2, 1977 |
| Priority date | — |
| Expiry date | Feb 17, 1996 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63F2250/1031
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
An element for use as a teaching, examination and instructional material formed of a sheet having a visible image imprinted thereon and coded images keyed to the visible image in which the coded images are formed with a material, such as liquid crystals, which changes in appearance in response to temperature and in which the material in one of the images has a different temperature response than the material in the others of the images whereby the sheet is capable of multiple use as a teaching, examination and instructional element.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.