US4344010A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Acceleration resistant combination of opposite-handed piezoelectric crystals
Assignee: United States Department of the Army
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Filing: 1979-10-19
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Granted: 1982-08-10
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Expires: 1999-10-19
Abstract
Abstract An acceleration resistant crystal features two crystals mounted together h at least two axes of each crystal being in antiparallel relationship with respect to corresponding axes of the other crystals. The two crystals can be chiral pairs and thus have three corresponding axes in antiparallel relationship for acceleration resistance in any arbitrary direction with respect to the crystal axes.
Inventors
- 👤 John R. Vig
- 👤 Arthur D. Ballato
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:07
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/46; H03H9/54; H03H9/58
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
62 words
A composite crystal structure comprising a left and right handed pair of crystals positioned adjacent one another and electrically coupled to each other, one of said crystals having three axes disposed in anti-parallel relationship with respect to the corresponding axes of the other crystal whereby the effect of acceleration in all directions on the resonant frequency of the composite structure is minimized.
Claim 2
Dependent Claim
62 words
A composite crystal structure comprising a left and right handed pair of crystals positioned adjacent one another and electrically coupled to each other, one of said crystals having three axes disposed in anti-parallel relationship with respect to the corresponding axes of the other crystal whereby the effect of acceleration in all directions on the resonant frequency of the composite structure is minimized.
Claim 3
Dependent Claim
21 words
A composite crystal structure as claimed in claim 1, wherein said crystals are both mechanically and electrically coupled to each other.
Claim 4
Dependent Claim
31 words
A composite crystal structure as claimed in claim 2, wherein each of said crystals have metal electrodes disposed on either side thereof, and further comprising an insulator disposed between said crystals.
Claim 5
Dependent Claim
18 words
A composite crystal structure as claimed in claim 3, further comprising lead means for coupling said crystals together.
Claim 6
Dependent Claim
19 words
A composite crystal structure as claimed in claim 4, wherein said lead means electrically couples said crystals in series.
Claim 7
Dependent Claim
19 words
A composite crystal structure as claimed in claim 4, wherein said lead means electrically couples said crystals in parallel.
Claim 8
Dependent Claim
43 words
A composite crystal structure as claimed in claim 1, wherein each of said crystals have a single metallizing electrode, and further comprising an intermediate conducting electrode coupled to both of said crystals, and a lead means for electrically connecting said crystals in parallel.
Claim 9
Dependent Claim
20 words
A composite crystal structure as claimed in claim 1, wherein said crystals are mechanically coupled without any intermediate structure therebetween.
Claim 10
Dependent Claim
50 words
A composite crystal structure comprising an enantiomorphous pair of closely positioned crystals, one of said crystals having three axes arranged in anti-parallel relationship with respect to the corresponding axes of the other of said pair of crystals, said crystals being electrically coupled together and being acceleration resistant in all directions.
Claim 11
Dependent Claim
50 words
A composite crystal structure comprising an enantiomorphous pair of closely positioned crystals, one of said crystals having three axes arranged in anti-parallel relationship with respect to the corresponding axes of the other of said pair of crystals, said crystals being electrically coupled together and being acceleration resistant in all directions.
Claim 12
Dependent Claim
22 words
A composite crystal structure as claimed in claim 9, wherein said crystals are mechanically joined without the use of any intermediate structure.
Claim 13
Dependent Claim
32 words
A composite crystal structure as claimed in claim 9, further comprising a common center electrode means for joining said crystals together, and a lead means for electrically coupling said crystals in parallel.
Claim 14
Dependent Claim
18 words
A composite crystal structure as claimed in claim 9, wherein said crystals are mounted within flat-pack type mounts.
Claim 15
Dependent Claim
38 words
A composite crystal structure as claimed in claim 1, including means on a surface of each crystal for identifying the opposite handedness of one with respect to the other to facilitate the antiparallel alignment of said crystal axes.
Claim 16
Dependent Claim
18 words
A composite crystal structure as claimed in claims 1 or 9, wherein said crystal pairs are AT cuts.
Claim 17
Dependent Claim
18 words
A composite crystal structure as claimed in claims 1 or 9, wherein said crystal pairs are SC cuts.
Claim 18
Dependent Claim
25 words
A composite crystal structure as claimed in claims 1 or 9, wherein said crystal pairs are cuts on the zero temperature coefficient of frequency locus.
Claim 19
Dependent Claim
19 words
A composite crystal structure as claimed in claims 1 or 9, wherein said crystals have slightly differing resonant frequencies.
Claim 20
Dependent Claim
20 words
A composite crystal structure as claimed in claims 1 or 9, wherein said crystal pairs are chemically polished doubly-rotated cuts.
Claim 21
Dependent Claim
19 words
A composite crystal structure as claimed in claims 1 or 9, wherein said crystal pairs are chemically polished SC-cuts.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1985-08-09 | 1986-02-08 | 1986-08-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-09 | 1990-02-08 | 1990-08-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-09 | 1994-02-08 | 1994-08-10 | $7700.00 | Window Closed / Lapsed |