Photographic film packet and light locking element
US5510869A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 30, 1994 |
| Grant date | Apr 23, 1996 |
| Priority date | — |
| Expiry date | Mar 30, 2014 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B17/32
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An improved photographic film packet (P) has a photosensitive film sheet (F) , an elongate carrier sheet (C), a light shielding envelope and a transversely disposed element (30) secured to the carrier (C). The light shielding envelope (E) has a closed leading end portion and a closable trailing end portion (46). The trailing end portion includes lateral edge portions 46a, 46b) The transversely disposed element (30) or clip, being substantially U-shaped, has a vertex (30v) with an interior wall (33) that enables at least the lateral edge portions (46a, 46b) of the trailing end portion (46) of the envelope E to abut thereagainst for closing the trailing end portion (46). In another embodiment of the invention, transversely disposed element (30) is also provided with inward-facing dimples (31d) on at least one segment of first and second flange portions (30a,30b) that project from the vertex (30v). The inward-facing dimples (31d) are positioned for compressive engagement of the first and second opposing walls of the envelope E to further prevent the ingress of light therein.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.