Light-tight cassette
Patent 4597658 Issued on July 1, 1986. Estimated Expiration Date: 
December 5, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
December 5, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3551037 3784001 Light lock for roll dispensing container Light-tight cassette Cassette for holding and dispensing a roll of web material Patent #: 4403845 InventorsAssigneeApplicationNo. 06/678469 filed on 12/05/1984US Classes:396/513, Light seal206/409, With pay-out aperture242/348.4, Light occludent396/514Film or spool locking meansExaminersPrimary: Gellner, Michael L.Attorney, Agent or FirmInternational ClassG03B 27/58 (20060101)Foreign Application Priority Data1983-12-12 EPAbstractA light-tight cassette (1) suitable for holding a roll of web-like light-sensitive photographic material (2) wound around a core (6) and for dispensing the photographic material through a slit (19) provided in the cassette which is in the form of a box comprising a hollow shell portion (3) whose wall at three of its corners is at least partly and locally realized as a double wall and two end closure walls (4, 5) which are secured to the shell portion (3) by perforations provided in the outer wall of the double wall portions of the shell and cooperating detent fingers on the end closure walls. The inner wall of the double wall portions of the shell prevents light from intruding into the cassette through perforations in the outer shell wall and makes the cassette perfectly light-tight.Other References
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