US3733889A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Reference marker for nondestructive inspection techniques
Assignee: Combustion Engineering Inc
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Filing: 1970-08-26
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Granted: 1973-05-22
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Expires: 1990-08-26
Abstract
Abstract A reference marker for use in conjunction with volumetric inspection techniques on nuclear reactor pressure vessels. A block of material having a sharp corner geometry is provided at particular locations on the vessel structure to be inspected. The block of material then serves as a physical location reference marker and/or means for use in calibration of the volumetric inspection device.
Inventors
- 👤 E Proctor
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 02:59
CPC Classifications
G; G21; G21C; G21C17/00; G21C17/003; G01; G01N; G01N29/00; G01N29/22; G01N29/30; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
147 words
A reference marker for providing a reference point on a wall of a pressure vessel subject to examination by a nondestructive material inspection device, said reference marker comprising a block of material permanently affixed to said wall to be inspected at a particular location on one side thereof, said block being machined to a geometry having a rectangular configuration consisting of sharp corners, the outside edges of the rectangular configuration intersecting at 90* angles, and a fillet radius at the intersection of the block material and said wall, and wherein said nondestructive material inspection device includes an ultrasonic transducer crystal located on the opposite side of said wall from said block material which emits pulsed ultrasonic signals which travel through said wall to said block material and are reflected back through said wall to said crystal when said signals intercept the sharp corners of said block material.
Claim 2
Dependent Claim
147 words
A reference marker for providing a reference point on a wall of a pressure vessel subject to examination by a nondestructive material inspection device, said reference marker comprising a block of material permanently affixed to said wall to be inspected at a particular location on one side thereof, said block being machined to a geometry having a rectangular configuration consisting of sharp corners, the outside edges of the rectangular configuration intersecting at 90* angles, and a fillet radius at the intersection of the block material and said wall, and wherein said nondestructive material inspection device includes an ultrasonic transducer crystal located on the opposite side of said wall from said block material which emits pulsed ultrasonic signals which travel through said wall to said block material and are reflected back through said wall to said crystal when said signals intercept the sharp corners of said block material.
Claim 3
Dependent Claim
29 words
The reference marker of claim 1 wherein said block of material consists of weld material built up on the surface of one side of said wall to be inspected.
Claim 4
Dependent Claim
40 words
The reference marker of claim 2 wherein said fillet radius is Small as compared to the height of the intersecting wall of said reference marker so as to provide an adequate reflective surface for said ultrasonic transducer crystal pulsed signal.
Claim 5
Dependent Claim
169 words
In combination, a wall of a pressure vessel, a nondestructive material inspection device for examining said wall of said pressure vessel, and a reference marker for providing a reference point on said wall, said reference marker comprising a block of material permanently affixed to said wall to be examined at a particular location on one side thereof, said block material being machined to a geometry having a rectangular configuration consisting of sharp corners, the outside edges of the rectangular configuration intersecting at 90* angles, and a fillet radius at the intersection of the block material and said wall, and said nondestructive material inspection device comprising an ultrasonic transducer crystal located on the opposite side of said wall from said block material which emits pulsed ultrasonic signal which travel through said wall to said block material whereby when said pulsed ultrasonic signals traveling through said wall intercept the sharp corners of said block material permanently affixed to said wall, said signals are reflected back through said wall to said crystal.
Claim 6
Dependent Claim
169 words
In combination, a wall of a pressure vessel, a nondestructive material inspection device for examining said wall of said pressure vessel, and a reference marker for providing a reference point on said wall, said reference marker comprising a block of material permanently affixed to said wall to be examined at a particular location on one side thereof, said block material being machined to a geometry having a rectangular configuration consisting of sharp corners, the outside edges of the rectangular configuration intersecting at 90* angles, and a fillet radius at the intersection of the block material and said wall, and said nondestructive material inspection device comprising an ultrasonic transducer crystal located on the opposite side of said wall from said block material which emits pulsed ultrasonic signal which travel through said wall to said block material whereby when said pulsed ultrasonic signals traveling through said wall intercept the sharp corners of said block material permanently affixed to said wall, said signals are reflected back through said wall to said crystal.
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) | 1976-05-21 | 1976-11-20 | 1977-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-21 | 1980-11-20 | 1981-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-21 | 1984-11-20 | 1985-05-22 | $7700.00 | Window Closed / Lapsed |