Patent FR2346239A1 successfully refreshed from Google Patents.
US4031503A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Anti-corrosion ultrasonic transducer
Assignee: Yokogawa Electric Corp
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Filing: 1975-08-19
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Granted: 1977-06-21
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Expires: 1995-08-19
Abstract
Abstract An ultrasonic transducer suitable for use in a corrosive environment and constituted by a disc-type electrostriction element affixed to a rigid body of greater thickness and suspended within a case by a diaphragm secured to the body at a vibration node, the case being filled with an electrically non-conductive elastomeric material.
Inventors
- 👤 Hiroshi Minami
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:31
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/28; G01F23/296; G01F23/2968; B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0607; B06B1/0611; B06B1/0618; G01F23/2961; Y; Y10; Y10T; Y10T29/00; Y10T29/49; Y10T29/49002; Y10T29/49005
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
154 words
An ultrasonic transducer comprising: A. a cylindrical case provided at one end with an opening; B. an ultrasonic unit disposed within said case, said unit consisting essentially of a disc-shaped electrostriction element having an inherent resonance frequency, and a relatively thick rigid body affixed thereto which reduces the natural frequency of the element to a degree axially shifting the vibratory nodal point thereof into said body, means suspending said unit from said nodal point to occupy a position within said case in which it is spaced from the inner surface of the case and from said opening; C. an electrically non-conductive elastomeric material filling the free-space within said case and embedding the unit therein to permit ultrasonic energy to be emitted by said unit or received thereby through said opening, said energy being conveyed by said filling material which otherwise serves to isolate said unit from the environment in which the transducer is installed.
Claim 2
Dependent Claim
154 words
An ultrasonic transducer comprising: A. a cylindrical case provided at one end with an opening; B. an ultrasonic unit disposed within said case, said unit consisting essentially of a disc-shaped electrostriction element having an inherent resonance frequency, and a relatively thick rigid body affixed thereto which reduces the natural frequency of the element to a degree axially shifting the vibratory nodal point thereof into said body, means suspending said unit from said nodal point to occupy a position within said case in which it is spaced from the inner surface of the case and from said opening; C. an electrically non-conductive elastomeric material filling the free-space within said case and embedding the unit therein to permit ultrasonic energy to be emitted by said unit or received thereby through said opening, said energy being conveyed by said filling material which otherwise serves to isolate said unit from the environment in which the transducer is installed.
Claim 3
Dependent Claim
20 words
A transducer as set forth in claim 1, wherein said unit is suspended in said case by a corrugated diaphragm.
Claim 4
Dependent Claim
15 words
A transducer as set forth in claim 1, wherein said material is a polyurethane gum.
Claim 5
Dependent Claim
27 words
A transducer as set forth in claim 1, wherein said transducer is alternately coupled through a transmitter-receiver switch to a high-frequency pulse generator and to a receiver.
References Cited (Backward Citations)
US3387149A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-06-20 | 1980-12-20 | 1981-06-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-06-20 | 1984-12-20 | 1985-06-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-06-20 | 1988-12-20 | 1989-06-21 | $7700.00 | Window Closed / Lapsed |