Film winding safety mechanism
Patent 4332448 Issued on June 1, 1982. Estimated Expiration Date: 
November 17, 2000. 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 17, 2000. 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 2241122 3470803 3486431 3603233 3685414 InventorAssigneeApplicationNo. 06/207672 filed on 11/17/1980US Classes:396/396, From film drive transmission member396/511Detachable or removable film holder unitExaminersPrimary: Griffin, Ronald W.Attorney, Agent or FirmInternational ClassesG03B 43/00 (20060101)G03B 1/24 (20060101) G03B 17/30 (20060101) G03B 1/18 (20060101) AbstractA film winding safety mechanism is disclosed in which film metering and shutter-actuator mechanisms are driven from a sprocket wheel which is driven by film only when the film is properly loaded in a camera to be advanced by rotation of a take-up spool. The safety mechanism is disabled when no cartridge is installed in a manner such as to permit test operation of the camera shutter. | |
