US3569750A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Monolithic multifrequency resonator
Assignee: Collins Radio Co
•
Filing: 1968-11-29
•
Granted: 1971-03-09
•
Expires: 1988-11-29
Abstract
Abstract A multifrequency resonating device comprising a single, piezoelectric quartz crystal plate having a plurality of different thickness plateaus formed thereon and separated, one from the other, by sections of beveled surface areas which create acoustic impedance mismatches between the plateaus. Each plateau has coated upon both sides thereof conductive electrodes and suitable terminal leads extending therefrom. Each plateau is resonant at a different frequency without the necessity of separate crystal blank holders or separate temperature compensation circuits.
Inventors
- 👤 William D Beaver
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:35
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/54; H03H9/56
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
106 words
A mechanical resonating device for generating a plurality of resonant frequencies and comprising: a monolithic crystal plate having length, width, and thickness, and divided into at least two elongated regions; each of said elongated regions being further divided into sections, with each successive adjacent section in each region having a thickness less than the preceding section in said region, and with the thickness of each section being defined by the major surfaces thereof, which are parallel to each other; and opposing conductive electrode means formed on said sections; each of said sections being resonant at a given frequency different from the resonant frequencies of other sections.
Claim 2
Dependent Claim
106 words
A mechanical resonating device for generating a plurality of resonant frequencies and comprising: a monolithic crystal plate having length, width, and thickness, and divided into at least two elongated regions; each of said elongated regions being further divided into sections, with each successive adjacent section in each region having a thickness less than the preceding section in said region, and with the thickness of each section being defined by the major surfaces thereof, which are parallel to each other; and opposing conductive electrode means formed on said sections; each of said sections being resonant at a given frequency different from the resonant frequencies of other sections.
Claim 3
Dependent Claim
47 words
A mechanical resonating device in accordance with claim 1 in which said sections of said monolithic crystal plate are separated one from the other by segments of said crystal plate positioned therebetween with their exposed surfaces providing a beveled transition between the different thicknesses of adjacent sections.
Claim 4
Dependent Claim
51 words
A mechanical resonating device in accordance with claim 1 in which each section of each region, except the thickest and the thinnest portions of the crystal plate, have a thickness greater than one and less than the other of two adjacent sections in the same region and in the adjacent region.
Claim 5
Dependent Claim
47 words
A mechanical resonating device in accordance with claim 3 in which said sections of said monolithic crystal plate are separated one from the other by segments of said crystal blank positioned therebetween with their exposed surfaces providing a beveled transition between the different thicknesses of adjacent portions.
References Cited (Backward Citations)
US2859346A
Cited
US3146415A
Cited
US3222622A
Cited
US3264583A
Cited
US3310761A
Cited
US3277404A
Cited
US3283264A
Cited
US3363119A
Cited
US3401275A
Cited
US3384768A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-03-08 | 1974-09-07 | 1975-03-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-03-08 | 1978-09-07 | 1979-03-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-03-08 | 1982-09-07 | 1983-03-09 | $7700.00 | Window Closed / Lapsed |