The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Jun. 07, 1977
Filed:
Aug. 12, 1976
Joseph A Stella, Peabody, MA (US);
Paul B Mason, Magnolia, MA (US);
Polaroid Corporation, Cambridge, MA (US);
Abstract
Apparatus for facilitating the achievement of locking engagement between the film strip contained in a film cassette of the type in which the film may be exposed, processed and projected without removal from the cassette, and a pull-strip for removing a tear-tab closure initially sealing a supply of processing fluid within the cassette. The supply end of the film strip contains a bottle-shaped aperture through which a tapered latching tongue provided at the free end of the pull-strip passes upon initiation of rewind after exposure. The supply reel hub is provided with a latching tongue receiving surface lying below the film receiving surface of the hub which, upon continued advancement of the film strip, receives and supports the latching tongue to fold it back upon itself. The bottle-shaped aperture in the film strip includes a first section through which the tapered latching tongue initially passes and a locking section communicating with the first section by a narrow passageway defined by a pair of inwardly extending tabs. The passageway defined by the inwardly extending tabs is narrower than the tapered latching tongue and the tabs are caused to deflect downwardly into the region below the hub surface and above the latching tongue receiving surface to further facilitate passage of the latching tongue into locking engagement with the film strip aperture responsive to the resisting force of the initial removal of the tear-tab closure.