US3732444A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Tubular transducer and dry couplant therefor
Assignee: Boeing North American Inc
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Filing: 1971-04-30
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Granted: 1973-05-08
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Expires: 1991-04-30
Abstract
Abstract A probe for nondestructive testing to identify internal structural defects comprises a tubular piezoelectric element adapted for low frequency vibration while moving in rolling contact over a workpiece surface. A dry adhesive couplant forms a mechanical bond between the piezoelectric element and the workpiece surface, and is also useful with disc-type probes known to the prior art, especially when the adhesive is coated with a layer of minute glass beads.
Inventors
- 👤 D Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 11:41
CPC Classifications
G; G01; G01N; G01N29/00; G01N29/22; G01N29/24; G01N29/2493; B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0644; B06B1/0655; G01N29/28
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
60 words
A couplant means for a transducer system comprising: a workpiece to be inspected; a transducer probe for detecting internal structural defects in said workpiece; a coating of adhesive on said probe; and a layer of glass beads from 5 to 25 microns in diameter interposed between said probe and said workpiece, said glass beads are applied to said adhesive coating.
Claim 2
Dependent Claim
60 words
A couplant means for a transducer system comprising: a workpiece to be inspected; a transducer probe for detecting internal structural defects in said workpiece; a coating of adhesive on said probe; and a layer of glass beads from 5 to 25 microns in diameter interposed between said probe and said workpiece, said glass beads are applied to said adhesive coating.
Claim 3
Dependent Claim
52 words
A couplant means for a transducer system comprising: a workpiece to be inspected; a transducer probe for detecting internal structural defects in said workpiece; a portion of silicone fiberglass tape secured to said probe; a coating of adhesive on said tape, and a layer of glass beads secured to said adhesive coating.
Claim 4
Dependent Claim
52 words
A couplant means for a transducer system comprising: a workpiece to be inspected; a transducer probe for detecting internal structural defects in said workpiece; a portion of silicone fiberglass tape secured to said probe; a coating of adhesive on said tape, and a layer of glass beads secured to said adhesive coating.
References Cited (Backward Citations)
US2602327A
Cited
US2917642A
Cited
US3315520A
Cited
US3423991A
Cited
US3441754A
Cited
US3538232A
Cited
US3621709A
Cited
US3624264A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-05-07 | 1976-11-06 | 1977-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-05-07 | 1980-11-06 | 1981-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-05-07 | 1984-11-06 | 1985-05-08 | $7700.00 | Window Closed / Lapsed |