Multi-function drafting instrument
US5497558A · kind A · utility
11Cited by
11References
13Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 24, 1995 |
| Grant date | Mar 12, 1996 |
| Priority date | — |
| Expiry date | Jan 24, 2015 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B3/56
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A drafting instrument is disclosed that functions as a protractor, compass, T-square and ruler. The instrument is especially adaptable for use on dry erase boards, chalkboards and tables Apertures disposed in the ruler portion of the instrument accommodate pen tips and facilitate the drawing of arcs, circles and parallel lines. The preferred embodiment of the instrument is two-piece with a uni-body instrument and a suction cup pivotally attached to the underside thereof.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.