Axial flow valve
Patent 4213371 Issued on July 22, 1980. Estimated Expiration Date: 
July 24, 1998. 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 24, 1998. 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 105059 455562 1703411 3886837 Axial flow valve Patent #: 4112806 InventorApplicationNo. 05/927565 filed on 07/24/1978US Classes:84/390, Rotary movement84/396Tuning devicesExaminersPrimary: Franklin, Lawrence R.Attorney, Agent or FirmInternational ClassesG10D 9/00 (20060101)G10D 9/04 (20060101) AbstractA rotary valve for selectively inserting and removing a slide loop from the sound path of a musical instrument is disclosed. The valve includes a rotor having two sound passages extending therethrough, one of the passages being straight and the other being only slightly curved. These passages align axially with the instrument's lead pipe, main bore, and slide loop ends so that a minimum of undesired harmonics are added to the tone of the instrument due to presence of the valve in the sound path. | |
