Film packet
US4821054A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 31, 1988 |
| Grant date | Apr 11, 1989 |
| Priority date | — |
| Expiry date | May 31, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG03B17/26
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A packet for daylight-handling of photosensitive film and a cooperating holder mountable on a camera back. The packet has film removably attached to a carrier. The carrier has, at one end, an asymmetrical tab bearing adhesive material and, at its opposite end, a transverse light-locking element. Telescopically receivable over the carrier and film is a light-shielding envelope. The envelope has an open end that is closable by engagement with the light-locking element and a closed end with a sealing area that overlies and, when grasped, adheres to the tab, to prevent inadvertent separation of the envelope from the carrier. An adjacent area, not overlying the tab, is graspable for pulling the sealing area free of the tab and the envelope away from the film, to permit intended exposure. The envelope also has, near its open end, a stop strip for limiting envelope movement. The packet is slidably insertable into, and withdrawable from, the cooperating holder, which includes a spring-loaded pressure-applying member for maintaining the film in an exposure plane, a spring-loaded latching member engageable with the light-locking element to retain the carrier in place, a spring-loaded blockin…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.