US3908439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flat bottom reference reflectors for ultrasonic inspection
Assignee: Curtiss Wright Corp
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Filing: 1974-09-24
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Granted: 1975-09-30
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Expires: 1994-09-24
Abstract
Abstract A set of test blocks of different lengths and tapered at one end to different size reflecting surfaces for use in calibrating ultrasonic flaw detection test equipment.
Inventors
- 👤 Andrew Pelak
- 👤 Fred H Michelsohn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 18:28
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/22; G01N29/30; G01M; G01M3/00; G01M3/007; G01M3/02; G01M3/04; G01M3/24; G01N29/44; G01N29/4463
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
116 words
A reference block for use in calibrating ultrasonic flaw detection test equipment, said block having a first relatively large flat surface at one end and through which ultrasonic energy is to be introduced into the block, the other end of said block being tapered to a relatively small flat surface at the extreme end of the block remote from said large end surface and being of prescribed cross-sectional area from which at least a substantial portion of said ultrasonic energy is to be reflected back to said large end surface, the two flat end surfaces of said block being parallel and being spaced apart a prescribed distance so that the block has a prescribed effective length.
Claim 2
Dependent Claim
116 words
A reference block for use in calibrating ultrasonic flaw detection test equipment, said block having a first relatively large flat surface at one end and through which ultrasonic energy is to be introduced into the block, the other end of said block being tapered to a relatively small flat surface at the extreme end of the block remote from said large end surface and being of prescribed cross-sectional area from which at least a substantial portion of said ultrasonic energy is to be reflected back to said large end surface, the two flat end surfaces of said block being parallel and being spaced apart a prescribed distance so that the block has a prescribed effective length.
Claim 3
Dependent Claim
60 words
A reference block as claimed in claim 1, in combination with a tubular member fitted about the portion of said block adjacent to its large end surface and having a portion projecting beyond said reflecting end so that said block may be supported by said projecting portion from a base structure with said reflecting end spaced from said base structure.
Claim 4
Dependent Claim
34 words
A reference block as claimed in claim 1 in which the portion of said block adjacent to its large end surface has a cylindrical cross-section and the tapered end of said block is conical.
Claim 5
Dependent Claim
119 words
A set of reference blocks for use in calibrating ultrasonic flaw detection test equipment, said set including at least three blocks each having a relatively large flat surface at one end and through which ultrasonic energy is to be introduced into the block with the other end of said block being tapered to a relatively small flat surface at the extreme end of the block remote from its large end surface, said small surface of each block being parallel to its larger end surface and from which at least a substantial portion of said ultrasonic energy is to be reflected back to said large end surface, said blocks having different lengths but having the same diameter reflecting end surfaces.
Claim 6
Dependent Claim
119 words
A set of reference blocks for use in calibrating ultrasonic flaw detection test equipment, said set including at least three blocks each having a relatively large flat surface at one end and through which ultrasonic energy is to be introduced into the block with the other end of said block being tapered to a relatively small flat surface at the extreme end of the block remote from its large end surface, said small surface of each block being parallel to its larger end surface and from which at least a substantial portion of said ultrasonic energy is to be reflected back to said large end surface, said blocks having different lengths but having the same diameter reflecting end surfaces.
Claim 7
Dependent Claim
42 words
A set of reference blocks as claimed in claim 4 and including a second group of three blocks generally similar to the first mentioned three blocks but having reflecting end surfaces of different diameter from that of said first mentioned three blocks.
References Cited (Backward Citations)
US3677061A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-09-29 | 1979-03-31 | 1979-09-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-09-29 | 1983-03-31 | 1983-09-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-09-29 | 1987-03-31 | 1987-09-30 | $7700.00 | Window Closed / Lapsed |