Rolling ruler having a retractable and rotatable pivot pin
US5050309A · kind A · utility
9Cited by
17References
2Claims
0Family size
Inventor
Key dates
| Filing date | Sep 24, 1990 |
| Grant date | Sep 24, 1991 |
| Priority date | — |
| Expiry date | Sep 24, 2010 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB43L7/04
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
A multipurpose ruler to permit a user to precisely draw geometric shapes as well as to store information including a housing having a rotatable roller with multiple information areas and an alignment mark to permit the user precisely align the ruler for accurately drawing geometric figures. A retractable pivot pin permits the user to draw circles about the pivot pin and a transparent housing permits a user to readily view information stored on the ruler.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.