US3792294A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rectangular at-cut crystal plate
Assignee: AT&T Inc
•
Filing: 1972-10-19
•
Granted: 1974-02-12
•
Expires: 1992-10-19
Abstract
Abstract Rectangular AT-cut quartz crystal plates designed for the frequency range of 1 to 6 MHz have width-to-thickness ratios chosen from the ranges 2.5 to 3.5, 5.5 to 7, 8.5 to 10, and 11.5 to 13.5 to avoid length-width shear resonances and thus eliminate unwanted resonances near the desired thickness-shear resonance. These rectangular AT-cut plates offer significant manufacturing and packaging advantages over existing AT-cut plates.
Inventors
- 👤 J Royer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:28
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/02007; H03H9/02157; H03H9/15; H03H9/17; H03H9/19
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
45 words
A rectangular AT-cut quartz crystal plate having an orientation (yxl) of approximately 35* 20'' /0*/0*; a width-tothickness ratio within the ranges of 2.5 to 3.5, 5.5 to 7, 8.5 to 10, 11.5 to 13.5; and a length-to-thickness ratio within the range of 30 to 150.
Claim 2
Dependent Claim
45 words
A rectangular AT-cut quartz crystal plate having an orientation (yxl) of approximately 35* 20'' /0*/0*; a width-tothickness ratio within the ranges of 2.5 to 3.5, 5.5 to 7, 8.5 to 10, 11.5 to 13.5; and a length-to-thickness ratio within the range of 30 to 150.
Claim 3
Dependent Claim
14 words
The plate of claim 1 in which the ratio of length-to-thickness is substantially 30.
Claim 4
Dependent Claim
12 words
The plate of claim 1 in which the length-to-thickness is substantially 60.
Claim 5
Dependent Claim
41 words
A rectangular AT-cut quartz crystal plate having an orientation (yxl) of approximately 35*20'' /0*/0*, a width-to-thickness ratio within the ranges of 2.5 to 3.5, 5.5 to 7, 8.5 to 10 and a length-to-thickness ratio within the range of 30 to 150.
Claim 6
Dependent Claim
41 words
A rectangular AT-cut quartz crystal plate having an orientation (yxl) of approximately 35*20'' /0*/0*, a width-to-thickness ratio within the ranges of 2.5 to 3.5, 5.5 to 7, 8.5 to 10 and a length-to-thickness ratio within the range of 30 to 150.
Claim 7
Dependent Claim
35 words
A rectangular AT-cut quartz crystal plate having an orientation (yxl) of approximately 35*20'' /0*/0*, a width-to-thickness ratio within the range of 2.5 to 3.5 and a length-to-thickness ratio within the range of 30 to 150.
Claim 8
Dependent Claim
35 words
A rectangular AT-cut quartz crystal plate having an orientation (yxl) of approximately 35*20'' /0*/0*, a width-to-thickness ratio within the range of 2.5 to 3.5 and a length-to-thickness ratio within the range of 30 to 150.
Claim 9
Dependent Claim
35 words
A rectangular AT-cut quartz crystal plate having an orientation (yxl) of approximately 35*20'' /0*/0*, a width-to-thickness ratio within the range of 5.5 to 7 and a length-to-thickness ratio within the range of 30 to 150.
Claim 10
Dependent Claim
35 words
A rectangular AT-cut quartz crystal plate having an orientation (yxl) of approximately 35*20'' /0*/0*, a width-to-thickness ratio within the range of 5.5 to 7 and a length-to-thickness ratio within the range of 30 to 150.
Claim 11
Dependent Claim
35 words
A rectangular AT-cut quartz crystal plate having an orientation (yxl) of approximately 35*20'' /0*/0*, a width-to-thickness ratio within the range of 8.5 to 10 and a length-to-thickness ratio within the range of 30 to 150.
Claim 12
Dependent Claim
35 words
A rectangular AT-cut quartz crystal plate having an orientation (yxl) of approximately 35*20'' /0*/0*, a width-to-thickness ratio within the range of 8.5 to 10 and a length-to-thickness ratio within the range of 30 to 150.
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) | 1977-02-11 | 1977-08-13 | 1978-02-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-11 | 1981-08-13 | 1982-02-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-11 | 1985-08-13 | 1986-02-12 | $7700.00 | Window Closed / Lapsed |