Container for light-sensitive material
US4431139A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 26, 1982 |
| Grant date | Feb 14, 1984 |
| Priority date | — |
| Expiry date | Jul 26, 2002 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C3/00
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A container for light-sensitive material is folded from a blank of thin opaque material. The blank has four rectangular panels hingedly connected so as to be foldable to form a generally rectangular tube with four sides and two open ends. A cap associated with each end of the tube closes the container in a light-tight manner. Interlocking structure is associated with the hinge connections for forming a tortuous light path to inhibit any light leakage through the material at the hinge connection from reaching the contents of the container. Besides the light-locking effect of the interlocking structure, it enhances cartridge strength in that all edges, when folded up, are double thickness of material. The end caps of the container may be blanked with the side panels with a hinge connection between each end cap and one of the side panels. To prevent light leaks, ridges are formed on the side panel and the end cap to form a tortuous path for any light which leaks through the blushed area.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.