Patent US3973149A successfully refreshed from Google Patents.
US3973149A
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US
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Devices using piezoelectric Ti3 BX4 compounds
Assignee: Westinghouse Electric Corp
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Filing: 1975-01-10
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Granted: 1976-08-03
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Expires: 1995-01-10
Abstract
Abstract A crystal resonator is disclosed of a single crystal of the approximate composition Tl 3 BX 4 having two parallel surfaces normal to a zero temperature coefficient of frequency direction and having an electrode mounted on each surface, where B is vanadium, niobium, or tantalum, and X is sulfur or selenium. A filter is disclosed of a crystal resonator coupled to a capacitor or more than one crystal resonator in series each coupled to a capacitor. A voltage controlled crystal oscillator resonator is disclosed of a crystal resonator in parallel with an inductor and a varactor.
Inventors
- 👤 Christopher R. Vale
- 👤 Thelma J. Isaacs
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 02:47
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/15; H03H9/17; H03H9/176
Claims Analysis
Total Claims: 34
Claim 1
Independent Claim
62 words
A crystal resonator comprising: A. a single crystal of the approximate composition Tl 3 BX 4 within about ±5% of stoichiometric, having two parallel surfaces, where B is selected from the group consisting of vanadium, niobium, tantalum, and mixtures thereof, and X is selected from the group consisting of sulfur, selenium, and mixtures thereof, and B. an electrode mounted on each surface.
Claim 2
Dependent Claim
62 words
A crystal resonator comprising: A. a single crystal of the approximate composition Tl 3 BX 4 within about ±5% of stoichiometric, having two parallel surfaces, where B is selected from the group consisting of vanadium, niobium, tantalum, and mixtures thereof, and X is selected from the group consisting of sulfur, selenium, and mixtures thereof, and B. an electrode mounted on each surface.
Claim 3
Dependent Claim
22 words
A crystal resonator according to claim 1 wherein said two parallel surfaces are normal to a zero temperature coefficient of frequency direction.
Claim 4
Dependent Claim
24 words
A crystal resonator according to claim 1 wherein said crystal has the composition Tl 3 VS 4 , within about ± 5% of stoichiometric.
Claim 5
Dependent Claim
41 words
A crystal resonator according to claim 3 wherein said surfaces are normal to a crystal direction of about 13° from a 001 direction going towards a 110 direction with the 13° rotation occurring in a plane perpendicular to a 110 direction.
Claim 6
Dependent Claim
23 words
A crystal resonator according to claim 1 wherein said crystal has the composition Tl 3 VSe 4 within about ± 5% of stoichiometric.
Claim 7
Dependent Claim
23 words
A crystal resonator according to claim 1 wherein said crystal has the composition Tl 3 TaS 4 within about ± 5% of stoichiometric.
Claim 8
Dependent Claim
23 words
A crystal resonator according to claim 1 wherein said crystal has the composition Tl 3 TaSe 4 within about ± 5% of stoichiometric.
Claim 9
Dependent Claim
23 words
A crystal resonator according to claim 1 wherein said crystal has the composition Tl 3 NbS 4 within about ± 5% of stoichiometric.
Claim 10
Dependent Claim
29 words
A crystal resonator according to claim 1 wherein said surface is at least about 5mm in diameter and the distance between said surfaces is about 0.03 to about 0.9mm.
Claim 11
Dependent Claim
26 words
A filter comprising at least one crystal resonator according to claim 1, in series if more than one, each crystal resonator being coupled by a capacitor.
Claim 12
Dependent Claim
17 words
A filter according to claim 10 wherein said capacitors are each about 200 to about 2000 pf.
Claim 13
Dependent Claim
17 words
A filter according to claim 10 wherein the number of said capacitors is about 1 to 20.
Claim 14
Dependent Claim
12 words
A filter according to claim 10 wherein said capacitors are fixed capacitors.
Claim 15
Dependent Claim
18 words
A method of filtering a wideband electrical signal comprising passing it through a filter according to claim 10.
Claim 16
Dependent Claim
22 words
A voltage controlled crystal oscillator resonator comprising a crystal resonator according to claim 1 in parallel with an inductor and a varactor.
Claim 17
Dependent Claim
21 words
A filter according to claim 10 wherein said two parallel surfaces are normal to a zero temperature coefficient of frequency direction.
Claim 18
Dependent Claim
22 words
A filter according to claim 10 wherein said crystal has the composition Tl 3 VS 4 , within about ±5% of stoichiometric.
Claim 19
Dependent Claim
40 words
A filter according to claim 17 wherein said surfaces are normal to a crystal direction of about 13° from a 001 direction going towards a 110 direction with the 13° rotation occurring in a plane perpendicular to a 110 direction.
Claim 20
Dependent Claim
21 words
A filter according to claim 10 wherein said crystal has the composition Tl 3 VSe 4 within about ±5% of stoichiometric.
Claim 21
Dependent Claim
21 words
A filter according to claim 10 wherein said crystal has the composition Tl 3 TaS 4 within about ±5% of stoichiometric.
Claim 22
Dependent Claim
21 words
A filter according to claim 10 wherein said crystal has the composition Tl 3 TaSe 4 within about ±5% of stoichiometric.
Claim 23
Dependent Claim
21 words
A filter according to claim 10 wherein said crystal has the composition Tl 3 NbS 4 within about ±5% of stoichiometric.
Claim 24
Dependent Claim
28 words
A filter according to claim 10 wherein said surface is at least about 5mm in diameter and the distance between said surfaces is about 0.03 to about 0.9mm.
Claim 25
Dependent Claim
22 words
A method according to claim 14 wherein the center frequency of said wideband electrical signal is about 5 to about 35 MHz.
Claim 26
Dependent Claim
36 words
A voltage controlled crystal oscillator resonator according to claim 15 wherein the voltage of said varactor is about 1 to about 20 volts and the capacitance of said varactor is about 0.5 to about 30 pf.
Claim 27
Dependent Claim
25 words
A voltage controlled crystal oscillator resonator according to claim 15 wherein said two parallel surfaces are normal to a zero temperature coefficient of frequency direction.
Claim 28
Dependent Claim
25 words
A voltage controlled crystal oscillator according to claim 15 wherein said crystal has the composition Tl 3 VS 4 , within about ±5% of stoichiometric.
Claim 29
Dependent Claim
44 words
A voltage controlled crystal oscillator resonator according to claim 27 wherein said surfaces are normal to a crystal direction of about 13° from a 001 direction going towards a 110 direction with the 13° rotation occurring in a plane perpendicular to a 110 direction.
Claim 30
Dependent Claim
25 words
A voltage controlled crystal oscillator resonator according to claim 15 wherein said crystal has the composition Tl 3 VSe 4 within about ±5% of stoichiometric.
Claim 31
Dependent Claim
25 words
A voltage controlled crystal oscillator resonator according to claim 15 wherein said crystal has the composition Tl 3 TaS 4 within about ±5% of stoichiometric.
Claim 32
Dependent Claim
25 words
A voltage controlled crystal oscillator resonator according to claim 15 wherein said crystal has the composition Tl 3 TaSe 4 within about ±5% of stoichiometric.
Claim 33
Dependent Claim
25 words
A voltage controlled crystal oscillator resonator according to claim 15 wherein said crystal has the composition Tl 3 NbS 4 within about ±5% of stoichiometric.
Claim 34
Dependent Claim
32 words
A voltage controlled crystal oscillator resonator according to claim 15 wherein said surface is at least about 5mm in diameter and the distance between said surface is about 0.03 to about 0.9mm.
References Cited (Backward Citations)
US3771072A
Cited
US3772618A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-08-03 | 1980-02-02 | 1980-08-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-08-03 | 1984-02-02 | 1984-08-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-08-03 | 1988-02-02 | 1988-08-03 | $7700.00 | Window Closed / Lapsed |