Patent US4169236A successfully refreshed from Google Patents.
US4169236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotation of characteristic vectors with piezoelectric coupling
Assignee: United States Department of the Army
•
Filing: 1977-12-30
•
Granted: 1979-09-25
•
Expires: 1997-12-30
Abstract
Abstract Acoustic ultrasonic waves are launched in a block of single-crystal material, such as alpha-quartz, by means of a transducer fastened to one end of the block. The waves are steered by electrically altering the properties of the crystal between the piezoelectrically unstiffened and stiffened excitation modes.
Inventors
- 👤 Seymour Epstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:45
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/18
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
117 words
In combination, a block of electroelastically anisotropic single crystal material having at least one pair of juxtaposed plane parallel boundary faces, means for launching an ultrasonic acoustic beam in said crystal block which induces a piezoelectric field and induces a dielectric displacement field perpendicular to said induced piezoelectric field as said acoustic beam progresses along said block, first and second pair of deflection control electrode means disposed at said at least one pair of boundary faces of said block, and means for applying a potential to said at least one pair of said electrode means for creating an applied electric field interacting with said induced fields to alter the direction of propagation of said launched acoustic beam.
Claim 2
Dependent Claim
117 words
In combination, a block of electroelastically anisotropic single crystal material having at least one pair of juxtaposed plane parallel boundary faces, means for launching an ultrasonic acoustic beam in said crystal block which induces a piezoelectric field and induces a dielectric displacement field perpendicular to said induced piezoelectric field as said acoustic beam progresses along said block, first and second pair of deflection control electrode means disposed at said at least one pair of boundary faces of said block, and means for applying a potential to said at least one pair of said electrode means for creating an applied electric field interacting with said induced fields to alter the direction of propagation of said launched acoustic beam.
Claim 3
Dependent Claim
30 words
The combination of claim 1 wherein said boundary faces are end faces of said block and the direction of said applied electric field is parallel to said induced piezoelectric field.
Claim 4
Dependent Claim
31 words
The combination of claim 1, wherein said boundary faces are one pair of juxtaposed lateral faces of said block, and said applied electric field is parallel to said dielectric displacement field.
Claim 5
Dependent Claim
32 words
The combination of claim 1 wherein said boundary faces are the other pair of juxtaposed lateral faces of said block and said external electric field is perpendicular to said dielectric displacement field.
Claim 6
Dependent Claim
32 words
The combination of claim 3 further including electrode means on the other pair of juxtaposed lateral faces of said block and said external electric field is perpendicular to said dielectric displacement field.
Claim 7
Dependent Claim
24 words
The combination of claim 2 further including electrode means on at least one of said pairs of juxtaposed lateral end faces of said block.
References Cited (Backward Citations)
US3234488A
Cited
US3200354A
Cited
US3286205A
Cited
US3304520A
Cited
US3321647A
Cited
US4117424A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-09-24 | 1983-03-26 | 1983-09-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-09-24 | 1987-03-26 | 1987-09-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-09-24 | 1991-03-26 | 1991-09-25 | $7700.00 | Window Closed / Lapsed |