Light table for teaching geometric principles
US5343369A · kind A · utility
0Cited by
13References
6Claims
0Family size
Inventor
Key dates
| Filing date | Nov 24, 1992 |
| Grant date | Aug 30, 1994 |
| Priority date | — |
| Expiry date | Nov 24, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG09B23/04
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A light table includes a housing extending in a horizontal direction having legs extending downwardly therefrom. The housing defines X- and Y-axes and has an X-Y grid pattern formed thereon and visible from above the housing. A lighting system is used to illuminate the grid pattern. A frame extends vertically upwards from the housing and defines a Z-axis having an X-Z grid pattern formed thereon. A second lighting system illuminates the grid pattern on the vertical frame.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.