File stiffener
US5897141A · kind A · utility
13Cited by
5References
15Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Feb 11, 1997 |
| Grant date | Apr 27, 1999 |
| Priority date | — |
| Expiry date | Feb 11, 2017 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB42F13/004
- WIPO fieldOther consumer goods
- WIPO sectorOther fields
Abstract
The invention relates to a file stiffener for stiffening a file of the type having a pair of opposed covers hinged to and spaced apart from one another by a spine, in particular for ring binder and lever arch-type files. The file stiffener comprises at least one rigidifying spacer element, and mounting means for mounting the spacer element between the opposed covers, the spacer element being dimensioned to hold the covers apart in a rigid parallel configuration.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.