Method of adjusting the frequency of vibration of piezoelectric resonators
Patent 4021898 Issued on May 10, 1977. Estimated Expiration Date: 
May 10, 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.
May 10, 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.Patent References 2877338 3691720 InventorAssigneeApplicationNo. 05/688458 filed on 05/20/1976US Classes:29/25.35, PIEZOELECTRIC DEVICE MAKING219/121.62, Condition responsive219/121.69, Methods219/121.84, With fluid supply219/121.85, Method219/121.86, Chamber310/311, Piezoelectric elements and devices310/312, Adding or subtracting mass310/341, With temperature modifier and/or gas or vapor atmosphere control310/344Sealed unitExaminersPrimary: Hall, Carl E.Attorney, Agent or FirmAbstractA method of trimming or tuning the frequency of vibration of a piezoelectric resonator comprising varying the ambient gas pressure within an unsealed resonator can until the desired frequency is obtained. The can is then sealed at the desired pressure, and thereby maintains the desired resonant frequency.Field of SearchPIEZOELECTRIC DEVICE MAKING | |
