US4499395A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Cut angles for quartz crystal resonators
Assignee: United States Department of the Air Force
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Filing: 1983-05-26
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Granted: 1985-02-12
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Expires: 2003-05-26
Abstract
Abstract The present invention concerns itself with crystallographically doubly rotated quartz orientations vibrating in the transverse c-mode with turnover temperatures which are considerably less sensitive to angular misorientation than the comparable well known AT- or BT-cuts. These crystals are arbitrarily designated as AK-cut crystals and are defined by phi -angle variations between 30 DEG -60 DEG and theta -angle variations between 12 DEG -32 DEG . The turnover temperatures of these resonators are between 60 DEG C. and 200 DEG C.
Inventors
- 👤 Alfred Kahan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 01:36
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/02007; H03H9/02015; H03H9/02023
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
80 words
A crystal resonator comprising a thin, quartz plate vibrating in a thickness shear c-mode resonance and (A) having a doubly rotated crystallographic orientation around (1) the z-axis of said plate by an angle phi (φ) ranging from about 30° to 60° and (2) the x-axis of said plate by an angle theta (θ) ranging from about 12° to 31.92°; and (B) said crystalline resonator further characterized by having turnover temperatures in the range of about 60° C. to 200° C.
Claim 2
Dependent Claim
80 words
A crystal resonator comprising a thin, quartz plate vibrating in a thickness shear c-mode resonance and (A) having a doubly rotated crystallographic orientation around (1) the z-axis of said plate by an angle phi (φ) ranging from about 30° to 60° and (2) the x-axis of said plate by an angle theta (θ) ranging from about 12° to 31.92°; and (B) said crystalline resonator further characterized by having turnover temperatures in the range of about 60° C. to 200° C.
Claim 3
Dependent Claim
32 words
A crystal resonator in accordance with claim 1 wherein the angle phi (φ) is in the range of about 30° to 46° and the angle theta (θ) is about 14° to 30°.
Claim 4
Dependent Claim
15 words
A crystal resonator in accordance with claim 2 wherein the angles (φ,θ) are about (30.0,24.44)°.
Claim 5
Dependent Claim
15 words
A crystal resonator in accordance with claim 2 wherein the angles (φ,θ) are about (36.58,28.45)°.
Claim 6
Dependent Claim
15 words
A crystal resonator in accordance with claim 2 wherein the angles (φ,θ) are about (46.10,23.59)°.
Claim 7
Dependent Claim
15 words
A crystal resonator in accordance with claim 2 wherein the angles (φ,θ) are about (40.9,21.0)°.
Claim 8
Dependent Claim
15 words
A crystal resonator in accordance with claim 2 wherein the angles (φ,θ) are about (40.9,23.59)°.
Claim 9
Dependent Claim
15 words
A crystal resonator in accordance with claim 2 wherein the angles (φ,θ) are about (40.9,27.0)°.
Claim 10
Dependent Claim
15 words
A crystal resonator in accordance with claim 2 wherein the angles (φ,θ) are about (36.0,24.44)°.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-02-12 | 1988-08-13 | 1989-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-02-12 | 1992-08-13 | 1993-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-02-12 | 1996-08-13 | 1997-02-12 | $7700.00 | Window Closed / Lapsed |