Multipurpose built-up measuring device
US6033282A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 4, 1999 |
| Grant date | Mar 7, 2000 |
| Priority date | — |
| Expiry date | Feb 4, 2019 |
Classification
- Technology area (CPC A)Human Necessities
- CPC primaryA63H33/04
- WIPO fieldFurniture, games
- WIPO sectorOther fields
Abstract
Different types of measuring devices detachably built up with different elements are provided. The elements for forming the built-up measuring devices include suitable numbers of connecting rule elements, corner elements, swing elements, fixing bars, and fixing sleeves. The measuring devices that may be built up with the elements include but not limit to ruler, square, three-dimensional square, and arithmetic balance. These measuring devices integrate functions of many commercially available intellectual aids and can be used to take linear, area and cubic measures, practice four fundamental operations, and learn concepts about coordinates.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.