Patent US4450378A successfully refreshed from Google Patents.
US4450378A
Expired / Lapsed
US
⏱️ 0.0 years remaining
ZT-Cut piezo-electric resonator
Assignee: CENTRE ELCTRONIQUE HORLOGER SA
•
Filing: 1983-01-25
•
Granted: 1984-05-22
•
Expires: 2003-01-25
Abstract
Abstract A ZT-cut quartz crystal resonator comprises two thin rectangular plates connected together by at least one resonant arm which itself is connected to a support zone by a linking bar. A pair of electrodes is provided on the quartz resonator for receiving alternating electrical signals of opposite polarity for effecting in-phase contour-mode vibration of the plates while making the arms to vibrate in opposite phase to the plates.
Inventors
- 👤 Jean Hermann
- 👤 Claude Bourgeois
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 21:00
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/15; H03H9/17; H03H9/19; G; G04; G04F; G04F5/00; G04F5/04; G04F5/06; G04F5/063
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
54 words
A clamped piezoelectric resonator fabricated in a ZT-cut quartz substrate comprising two thin rectangular plates connected together by at least one resonant arm, said resonant arm being coupled to at least one support zone and said resonant arm having a resonant frequency which is substantially the same as the resonant frequency of said plates.
Claim 2
Dependent Claim
54 words
A clamped piezoelectric resonator fabricated in a ZT-cut quartz substrate comprising two thin rectangular plates connected together by at least one resonant arm, said resonant arm being coupled to at least one support zone and said resonant arm having a resonant frequency which is substantially the same as the resonant frequency of said plates.
Claim 3
Dependent Claim
38 words
A clamped piezoelectric resonator fabricated in a ZT-cut quartz substrate comprising two thin rectangular plates connected together by two resonant arms, each of said resonant arms being coupled to one of two support zones by a linking bar.
Claim 4
Dependent Claim
38 words
A clamped piezoelectric resonator fabricated in a ZT-cut quartz substrate comprising two thin rectangular plates connected together by two resonant arms, each of said resonant arms being coupled to one of two support zones by a linking bar.
Claim 5
Dependent Claim
16 words
Resonator according to claim 2, wherein the said zones are arranged between the said resonant arms.
Claim 6
Dependent Claim
15 words
Resonator according to claim 2, wherein the said support zones are arranged outside the resonator.
Claim 7
Dependent Claim
19 words
Resonator according to claim 4, wherein the said support zones form part of a frame surrounding the said resonator.
Claim 8
Dependent Claim
32 words
A clamped piezoelectric resonator fabricated in a ZT-cut quartz substrate comprising two thin rectangular plates connected together by two resonant arms, one of said resonant arms being connected to a support zone.
Claim 9
Dependent Claim
32 words
A clamped piezoelectric resonator fabricated in a ZT-cut quartz substrate comprising two thin rectangular plates connected together by two resonant arms, one of said resonant arms being connected to a support zone.
Claim 10
Dependent Claim
46 words
A clamped piezoelectric resonator fabricated in a ZT-cut quartz substrate comprising two thin rectangular plates connected together by three resonant arms wherein one arm is positioned between two outside arms and said two outside arms are each coupled to a support zone by a linking bar.
Claim 11
Dependent Claim
46 words
A clamped piezoelectric resonator fabricated in a ZT-cut quartz substrate comprising two thin rectangular plates connected together by three resonant arms wherein one arm is positioned between two outside arms and said two outside arms are each coupled to a support zone by a linking bar.
Claim 12
Dependent Claim
53 words
A piezoelectric resonator comprising: a piezoelectric substrate configured to form two resonating portions coupled to one another by at least one resonant arm having a resonant frequency substantially equal to the resonant frequency of said resonator portions; a support zone; and means coupling said at least one resonant arm to said support zone.
Claim 13
Dependent Claim
53 words
A piezoelectric resonator comprising: a piezoelectric substrate configured to form two resonating portions coupled to one another by at least one resonant arm having a resonant frequency substantially equal to the resonant frequency of said resonator portions; a support zone; and means coupling said at least one resonant arm to said support zone.
Claim 14
Dependent Claim
21 words
The piezoelectric resonator of claim 8 wherein said resonators are formed as two thin rectangular plates in a ZT-cut quartz substrate.
Claim 15
Dependent Claim
30 words
The resonator of claim 9 wherein the ratio of the length of said at least one resonant arm to the width of said rectangular plates lies between 0.7 and 1.4.
Claim 16
Dependent Claim
30 words
The resonator of claim 9 wherein the ratio of the length of said at least one resonant arm to the width of said rectangular plates lies between 1 and 1.1.
References Cited (Backward Citations)
US2301269A
Cited
US3245012A
Cited
JPS5239391A
Cited
JPS5248990A
Cited
JPS5253690A
Cited
US4313071A
Cited
US4368402A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1987-05-22 | 1987-11-21 | 1988-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-05-22 | 1991-11-21 | 1992-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-05-22 | 1995-11-21 | 1996-05-22 | $7700.00 | Window Closed / Lapsed |