Multi-propeller drive system
Patent 5413512 Issued on May 9, 1995. Estimated Expiration Date: 
July 5, 2014. 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.
July 5, 2014. 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 3112728 3922997 Shaft brake for marine propulsion system Torque converter marine transmission with variable power output Patent #: 4820209 InventorApplicationNo. 273438 filed on 07/05/1994US Classes:440/74, Shaft braking or locking440/75, Having transmission440/80TandemExaminersPrimary: Avila, StephenAttorney, Agent or FirmInternational ClassB63H 021/28AbstractA multi-propeller drive system having a single input shaft for connection an engine system, a differential gear assembly for dividing the driving force from the input drive shaft between a pair of output shafts and a pair of laterally spaced propellers driven by the output shafts of the differential gear assembly. The differential gear assembly operates in a manner wherein one output shaft, if required, is permitted to revolve at a different rate than the other output shaft. A pair of brake mechanisms acting on the output shafts of the differential gear assembly enable an operator to control the rotational speed of the respective propellers without modifying the engine speed or transmission settings. | |
