US3756070A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrasonic inspection device
Assignee: STAVELEY INSTRUMENTS Inc 421 NORTH QUAY STREET KENNEWICK WA 99336 A CORP OF WA
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Filing: 1970-10-13
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Granted: 1973-09-04
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Expires: 1990-10-13
Abstract
Abstract A nondestructive material tester which is comprised of a search unit of lithium niobate cut normal to the 0* Y axis. The parallel faces normal to the 0*Y axis have electrical energy of ultrasonic frequency applied thereto and receive ultrasonic energy from a test object.
Inventors
- 👤 Elroy J Mc
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 13:36
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/22; G01N29/24; G01N29/2437; G01N2291/00; G01N2291/04; G01N2291/042; G01N2291/0422; G01N2291/0426; G01N2291/044
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
26 words
The search unit of claim 1 further comprising: electrodes disposed on the faces of said plate and effective to apply an electrical signal to said transducer.
Claim 2
Dependent Claim
99 words
A search unit for transmitting ultrasonic energy in response to an electrical signal and for producing an electrical signal in response to ultrasonic energy incident thereon, said search unit comprising a search unit housing, a piezoelectric transducer including a plate of crystalline lithium niobate disposed in said housing and having a pair of parallel faces, said faces being normal to the 0* Y axis of the crystalline structure of the lithium niobate, a dampening material disposed in said housing, said dampening material abutting one face of said plate, and a pair of electrodes on the faces of said plate.
Claim 3
Dependent Claim
182 words
In a nondestructive test system for inspecting a workpiece and having means for generating and transmitting pulses of electrical energy and for receiving electrical signal together with means for utilizing the received signals, the combination of an ultrasonic search unit adapted to be acoustically coupled to the workpiece for transmitting ultrasonic energy into the workpiece and receiving ultrasonic energy returned from said workpiece, said search unit being coupled to said means and responsive to the pulse of electrical energy therefrom and effective to supply electrical signals thereto, a piezoelectric transducer in said search unit, said piezoelectric transducer including a plate of lithium niobate having a pair of parallel faces normal to the 0* Y axis, a pair of electrodes on said faces of said plate coupled to said means, said transducer being responsive to the pulses of electrical energy from said means and applied to said electrodes for providing corresponding pulses of ultrasonic vibrations from at least one of said faces, said transducer being responsive to ultrasonic vibrations incident on one of said faces for providing corresponding electrical signals across said electrodes.
Claim 4
Dependent Claim
63 words
In an ultrasonic nondestructive testing method in which ultrasonic energy is transmitted into a workpiece by a transducer and echoes of ultrasonic energy are received by a transducer from the workpiece, the improvement comprising transmitting and/or receiving the ultrasonic energy with a lithium niobate transducer having a major face thereof cut normal to the 0*Y axis and having an electrically conductive electrode thereon.
References Cited (Backward Citations)
US2803129A
Cited
US3591813A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-09-03 | 1977-03-05 | 1977-09-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-09-03 | 1981-03-05 | 1981-09-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-09-03 | 1985-03-05 | 1985-09-04 | $7700.00 | Window Closed / Lapsed |