Pencils not requiring sharpening
US4019822A · kind A · utility
10Cited by
4References
8Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Sep 2, 1975 |
| Grant date | Apr 26, 1977 |
| Priority date | — |
| Expiry date | Sep 2, 1995 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB43L19/0075
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
Pencils not requiring sharpening are produced by wrapping a thermoplastic resin sheet, which has been uniaxially stretched, around a core material so that a stretched direction of the sheet forms a spiral against the core material, whereby the sheet forms a holder for the pencil which may be stripped off to selectively expose the core material.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.