US3931598A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Normal reflective array compressor and method
Assignee: United States Department of the Navy
•
Filing: 1974-12-17
•
Granted: 1976-01-06
•
Expires: 1994-12-17
Abstract
Abstract Surface acoustic waves on a piezoelectric crystal substrate beat with the bulk shear wave energy generated by the incident surface wave and which pass through the thickness of the substrate to produce a beat signal which is collected and is useful in pulse systems.
Inventors
- 👤 Wayne L. Bongianni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 11:58
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/30; H03H9/42; H03H9/44; H03H9/02; H03H9/02535; H03H9/02637; H03H9/02653; H03H9/02661
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
159 words
An acoustic wave device comprising: a piezoelectric substrate having oppositely disposed flat surfaces; an input transducer on one surface of said substrate for launching acoustic surface waves traveling down said surface; an output transducer on the other opposite surface of said transducer for collecting acoustic surface waves traveling on said opposite surface in a direction opposite to the direction of travel on said one surface; said input and output transducers comprising metallic electrodes, the electrodes of said input transducer being in line with corresponding electrodes of said output transducer; arrays of electrode fingers on each of said surfaces, each said array having spacings between adjacent electrodes thereof which vary along the length of the substrate over which the acoustic surface wave is adapted to travel; the widths of the electrodes and the spacings between them of both arrays being the same with corresponding electrodes and spacings of both arrays on said opposite surfaces being in line with each other.
Claim 2
Dependent Claim
159 words
An acoustic wave device comprising: a piezoelectric substrate having oppositely disposed flat surfaces; an input transducer on one surface of said substrate for launching acoustic surface waves traveling down said surface; an output transducer on the other opposite surface of said transducer for collecting acoustic surface waves traveling on said opposite surface in a direction opposite to the direction of travel on said one surface; said input and output transducers comprising metallic electrodes, the electrodes of said input transducer being in line with corresponding electrodes of said output transducer; arrays of electrode fingers on each of said surfaces, each said array having spacings between adjacent electrodes thereof which vary along the length of the substrate over which the acoustic surface wave is adapted to travel; the widths of the electrodes and the spacings between them of both arrays being the same with corresponding electrodes and spacings of both arrays on said opposite surfaces being in line with each other.
Claim 3
Dependent Claim
32 words
An acoustic wave device according to claim 1, wherein said: transducers are of the interdigital type, the spacings between the electrode fingers of both arrays similarly increasing with distance from said transducers.
Claim 4
Dependent Claim
32 words
An acoustic wave device according to claim 1, wherein: said transducers are of the interdigital type, the spacings between the electrode fingers of both arrays similarly decreasing with distance from said transducers.
Claim 5
Dependent Claim
86 words
An acoustic wave device according to claim 1, wherein: said substrate is rectangular in shape and made of lithium niobate, said substrate being 0.1cm to 10cm wide, 0.1cm to 100cm long, and 0.1cm to 2cm thick, the ends of said substrate being covered with absorbent material to reduce reflections therefrom, said input and output transducers being positioned near the same end of said substrate, means for applying a wide range of very high frequencies to said input transducer, and receiver means coupled to said output transducer.
Claim 6
Dependent Claim
19 words
An acoustic wave device according to claim 1, wherein said oppositely disposed flat surfaces are parallel to each other.
References Cited (Backward Citations)
US3283264A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1979-01-05 | 1979-07-07 | 1980-01-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-01-05 | 1983-07-07 | 1984-01-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-01-05 | 1987-07-07 | 1988-01-06 | $7700.00 | Window Closed / Lapsed |