Protractor with digital readout
Patent 3996670 Issued on December 14, 1976. Estimated Expiration Date: 
December 14, 1993. 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 14, 1993. 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 2000926 2359018 2369425 2397300 2481062 3195410 3816930 InventorsApplicationNo. 498820 filed on 08/19/1974US Classes:33/530, Pitchometer33/1PT, Angular position transducer33/538Fixed pivot at one endExaminersPrimary: Aegerter, Richard E.Assistant: Phillips, Charles E. Attorney, Agent or FirmAbstractA protractor having a sine bar connected to the shaft of an electronic encoder and supported to a carriage movable axially and horizontally, but retained in fixed relationship to a table supporting a propeller for measuring and inspecting the blade angles thereof is characterized by its improved accuracy and repeatability.Field of SearchAngular position transducer | |
