Hand held transparency projector with simple advance mechanism
Patent 4396262 Issued on August 2, 1983. Estimated Expiration Date: 
November 30, 2001. 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.
November 30, 2001. 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 1814588 2100008 2146237 2583510 2764058 3218745 3466123 3801199 Hand-held film projectors Combination viewer and projector Patent #: 4185899 InventorsAssigneeApplicationNo. 06/325577 filed on 11/30/1981US Classes:353/43, GUN, FLASHLIGHT OR BATTERY OPERATED TYPE353/95, FILM GATE40/364Strip film viewerExaminersPrimary: Haroian, Harry N.Attorney, Agent or FirmInternational ClassG03B 21/00 (20060101)AbstractA hand-held transparency projector includes a housing having a recess formed in the housing for carrying a film cartridge, and a projection aperture in one end of the housing through which the images on the film in the cartridge may be projected. The housing carries a film-driving mechanism for advancing the film within the cartridge past the projection aperture when the cartridge is carried within the recess of the projector. The film-driving mechanism includes a claw mounted for slidable forward and return movements within the housing, the claw engaging perforations in the film at the end of the forward movement and advancing the film during the return movement in discrete steps of one frame. | |
