Audible tuning apparatus for a muffler
Patent 6520285 Issued on February 18, 2003. Estimated Expiration Date: 
August 31, 2021. 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.
August 31, 2021. 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 3253676 3563338 Tuneable tuned pipe exhaust system Adjustable motorcycle muffler Exhaust pipe structure for a motorcycle Exhaust pipe structure for a motorcycle Triad exhaust system Bypass muffler Sound adjustable tail pipe structure Patent #: 6367580 InventorApplicationNo. 944928 filed on 08/31/2001US Classes:181/241, Adjustable muffler (i.e., internal or external parts)181/227, Pipe-muffler (e.g., tail pipe type)181/252With sound absorbing materialExaminersPrimary: Dang, KhanhAttorney, Agent or FirmInternational ClassF01N 007/18AbstractAn adjustable muffler system for a combustible engine including a muffler adapted for connection with an exhaust pipe of an engine, a blocking tube configured to be removably inserted within the muffler, and latch means adapted to removably secure the blocking tube within the muffler. In other embodiments, the blocking tube can include various holes or slots and may be telescoping or fabricated from multiple pieces.Field of SearchAdjustable muffler (i.e., internal or external parts)With repair, replacement, or quick disassembly Pipe-muffler (e.g., tail pipe type) With exhaust pipe With muffler cut-out With pressure relief safety valve Continuous conduit With sound absorbing material With sound absorbing material Casings | |
