Lighttightly packaged roll of light-sensitive film
US5803255A · kind A · utility
2Cited by
10References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Apr 15, 1996 |
| Grant date | Sep 8, 1998 |
| Priority date | — |
| Expiry date | Apr 15, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03C3/00
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
A lighttightly packaged roll (10) of light-sensitive film wound on a hollow supporting core (15), which comprises a lighttight flexible end cover (11, 12) for each end surface of the roll, and a lighttight flexible circumferential cover (13) secured to the film and covering the outermost convolution thereof, the inside faces of the rims (22, 24) of the circumferential cover being sealed to the corresponding inside faces of the rims (21, 23) of the end covers, and the sealed rims of the lighttight wrapping thus formed having a bending all along their circumference towards the circumferential cover of said wrapping.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.