US4062154A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for automatically adjusting the frequency of piezoelectric resonators in the form of bars or plates
Assignee: SSIH Management Services SA
•
Filing: 1976-09-09
•
Granted: 1977-12-13
•
Expires: 1996-09-09
Abstract
Abstract A process for automatically adjusting the frequency of a piezoelectric reator in the form of a bar or plate includes the steps of applying a voltage to the resonator to cause it to resonate, measuring the frequency of the resonator continuously during a frequency adjusting cycle, continuously comparing the measured frequency with a desired frequency to obtain a difference frequency value, storing the difference frequency value at the beginning of the adjusting cycle, deriving from the difference frequency value a threshold value equal to one-half of the difference frequency value, comparing the threshold value with the frequency difference value, removing material by a sand blast from a first extremity of the resonator as long as the difference frequency value is greater than the threshold value and thereafter removing material from the other extremity of the resonator until the difference frequency value is nil.
Inventors
- 👤 Raymond Huguenin
- 👤 Hubert Matthey
- 👤 Martial Voumard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:22
CPC Classifications
H; H03; H03H; H03H3/00; H03H3/007; H03H3/02; H03H3/04; Y; Y10; Y10T; Y10T29/00; Y10T29/42; Y10T29/49; Y10T29/49002; Y10T29/49004
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
125 words
A process for automatically adjusting the frequency of a piezoelectric resonator in the form of a bar or plate, said process comprising the steps of: applying a voltage to said resonator to cause it to resonate; measuring the frequency of said resonator continuously during a frequency adjusting cycle; continuously comparing said measured frequency with a desired frequency to obtain a difference frequency value; storing said difference frequency value at the beginning of an adjusting cycle; deriving from said difference frequency value a threshold value equal to one half of said difference frequency value; comparing said threshold value with said difference frequency value; and, removing material from a first extremity of said resonator as long as said difference frequency value is greater than said threshold value.
Claim 2
Dependent Claim
125 words
A process for automatically adjusting the frequency of a piezoelectric resonator in the form of a bar or plate, said process comprising the steps of: applying a voltage to said resonator to cause it to resonate; measuring the frequency of said resonator continuously during a frequency adjusting cycle; continuously comparing said measured frequency with a desired frequency to obtain a difference frequency value; storing said difference frequency value at the beginning of an adjusting cycle; deriving from said difference frequency value a threshold value equal to one half of said difference frequency value; comparing said threshold value with said difference frequency value; and, removing material from a first extremity of said resonator as long as said difference frequency value is greater than said threshold value.
Claim 3
Dependent Claim
54 words
A process as claimed in claim 1 wherein the step of removing material from said first extremity is terminated and removal of material from the other extremity is begun when said difference frequency value equals said threshold value, removal of material from said other extremity being continued until said difference frequency value is nil.
Claim 4
Dependent Claim
38 words
A process as claimed in claim 2 wherein removal of said material from said first and other extremities is accomplished by directing jets of abrasive material toward said first and said other extremity from first and second nozzles.
Claim 5
Dependent Claim
33 words
A process as claimed in claim 2 wherein said resonator is rotated after removal of material from said first extremity is terminated and before removal of material from said other extremity is begun.
Claim 6
Dependent Claim
50 words
A process as claimed in claim 4 wherein removal of said material from said first and other extremities is accomplished by directing a jet of abrasive material from a single nozzle toward said first extremity before said resonator is rotated and toward said other extremity after said resonator is rotated.
Claim 7
Dependent Claim
38 words
A process as claimed in claim 2 wherein removal of said material from said first and other extremities is accomplished by directing a jet of abrasive material first toward said first extremity and then toward said other extremity.
References Cited (Backward Citations)
US3453781A
Cited
US3589081A
Cited
US3665570A
Cited
US3702042A
Cited
US3691695A
Cited
US3808752A
Cited
US3829962A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-12-12 | 1981-06-13 | 1981-12-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-12 | 1985-06-13 | 1985-12-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-12 | 1989-06-13 | 1989-12-13 | $7700.00 | Window Closed / Lapsed |