Patent 4033435 Issued on July 5, 1977. Estimated Expiration Date: July 5, 1994. 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.
In a brake actuator an electric motor is operable when energized to hold a resilient brake applying assembly in a retracted energy-storing position and to retain the assembly in the retracted position.