Patent US3714609A successfully refreshed from Google Patents.
US3714609A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Microwave ultrasonic delay line
Assignee: Individual
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Filing: 1970-07-31
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Granted: 1973-01-30
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Expires: 1990-07-31
Abstract
Abstract An ultrasonic delay line for use at microwave frequencies is provided in a thin epitaxial strip of ultrasonic wave conducting material laid down on a substrate body. An input transducer launches ultrasonic waves into the epitaxial strip at one end and an output transducer detects the ultrasonic waves at the other end of the strip. The major surfaces of the epitaxial strip are preferably adjacent a medium such that the interface therewith is highly reflective to the ultrasonic waves and the thickness of the epitaxial strip is precisely determined when it is formed so that the thickness is of the same order of magnitude as the inflection thickness for the material at an ultrasonic frequency in the microwave range.
Inventors
- 👤 D Whitney
- 👤 T Newkirk
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 10:49
CPC Classifications
H; H01; H01P; H01P9/00; H01P9/04; H01P9/02; H03; H03H; H03H9/00; H03H9/30; H03H9/40
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
127 words
A dispersive ultrasonic delay line comprising a substrate body; an epitaxial layer attached to said substrate body, comprising a single unitary crystalline material having a center of inversion symmetry and in which microwave ultrasonic material waves experience tolerable attenuation per unit length of the material, having a thickness of the same order of magnitude as the inflection thickness for said material at a preselected microwave frequency, and having major and minor surfaces, means for forming substantially reflective interfaces with substantial portions of said major surfaces of said epitaxial layer, means for launching longitudinal ultrasonic material waves into said epitaxial layer at a first portion thereof, and means for detecting said ultrasonic material waves in said epitaxial layer at a second portion thereof remote from said first portion.
Claim 2
Dependent Claim
127 words
A dispersive ultrasonic delay line comprising a substrate body; an epitaxial layer attached to said substrate body, comprising a single unitary crystalline material having a center of inversion symmetry and in which microwave ultrasonic material waves experience tolerable attenuation per unit length of the material, having a thickness of the same order of magnitude as the inflection thickness for said material at a preselected microwave frequency, and having major and minor surfaces, means for forming substantially reflective interfaces with substantial portions of said major surfaces of said epitaxial layer, means for launching longitudinal ultrasonic material waves into said epitaxial layer at a first portion thereof, and means for detecting said ultrasonic material waves in said epitaxial layer at a second portion thereof remote from said first portion.
Claim 3
Dependent Claim
127 words
A dispersive ultrasonic delay line comprising a substrate body; an epitaxial layer attached to said substrate body, comprising a single unitary crystalline material having a center of inversion symmetry and in which microwave ultrasonic material waves experience tolerable attenuation per unit length of the material, having a thickness of the same order of magnitude as the inflection thickness for said material at a preselected microwave frequency, and having major and minor surfaces, means for forming substantially reflective interfaces with substantial portions of said major surfaces of said epitaxial layer, means for launching longitudinal ultrasonic material waves into said epitaxial layer at a first portion thereof, and means for detecting said ultrasonic material waves in said epitaxial layer at a second portion thereof remote from said first portion.
Claim 4
Dependent Claim
127 words
A dispersive ultrasonic delay line comprising a substrate body; an epitaxial layer attached to said substrate body, comprising a single unitary crystalline material having a center of inversion symmetry and in which microwave ultrasonic material waves experience tolerable attenuation per unit length of the material, having a thickness of the same order of magnitude as the inflection thickness for said material at a preselected microwave frequency, and having major and minor surfaces, means for forming substantially reflective interfaces with substantial portions of said major surfaces of said epitaxial layer, means for launching longitudinal ultrasonic material waves into said epitaxial layer at a first portion thereof, and means for detecting said ultrasonic material waves in said epitaxial layer at a second portion thereof remote from said first portion.
Claim 5
Dependent Claim
41 words
Apparatus as recited in claim 1 wherein sAid substantially reflective interfaces define the boundaries of a path along the longitudinal axis of said epitaxial layer along which said ultrasonic material waves are conducted from said launching means to said detecting means.
Claim 6
Dependent Claim
23 words
Apparatus as recited in claim 1 further including an acoustic wave absorbing means abutting at least one minor surface of said epitaxial layer.
Claim 7
Dependent Claim
39 words
Apparatus as recited in claim 1 wherein said epitaxial layer is formed of a material selected from the group of single unitary crystalline materials having a center of inversion symmetry consisting of sapphire rutile spinel zirconium silicate, and zirconate.
Claim 8
Dependent Claim
52 words
Apparatus as recited in claim 1 wherein said substantially reflective interface forming means comprises a plurality of contiguous layers of alternately high and low acoustic impedance disposed adjacent and substantially parallel to said epitaxial layer, each contiguous layer being of a thickness equal to one quarter wavelength at said preselected microwave frequency.
Claim 9
Dependent Claim
29 words
Apparatus as recited in claim 1 wherein said epitaxial layer is in the form of an epitaxial membrance and the major surfaces of said membrane are adjacent a gas.
Claim 10
Dependent Claim
29 words
Apparatus as recited in claim 1 wherein said epitaxial layer is in the form of an epitaxial membrane and the major surfaces of said membrane are adjacent a vacuum.
Claim 11
Dependent Claim
30 words
Apparatus as recited in claim 1 wherein said substrate body has a substantially cylindrical configuration, and said epitaxial layer is formed in a helical path about said cylindrical substrate body.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-01-30 | 1976-07-31 | 1977-01-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-01-30 | 1980-07-31 | 1981-01-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-01-30 | 1984-07-31 | 1985-01-30 | $7700.00 | Window Closed / Lapsed |