Signature perforating knife and signature
US4951967A · kind A · utility
32Cited by
8References
5Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Sep 13, 1988 |
| Grant date | Aug 28, 1990 |
| Priority date | — |
| Expiry date | Sep 13, 2008 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T428/15
- WIPO fieldMachine tools
- WIPO sectorMechanical engineering
Abstract
A signature formed as a plurality of layers of paper sheets and having a fold line is provided along the fold line with a line of spaced perforations. This line of perforations is formed by a signature perforating knife which has a plurality of spaced perforating teeth. The folded signature avoids creases and bulges during stacking of plural signatures.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.