US4608507A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Damping device for focused piezoelectric transducer
Assignee: GALVANIC APPLIED SCIENCES USA
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Filing: 1984-06-29
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Granted: 1986-08-26
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Expires: 2004-06-29
Abstract
Abstract An ultrasonic detection apparatus having a transducer, a lens, and a damping ring, the damping ring being made of a material which is impedance-matched to the lens but which has a lower speed of sound so that stray noise in the lens travels into the damping ring and dissipates rather than remaining in the lens and reflecting back to the transducer as noise.
Inventors
- 👤 Werner G. Neubauer
- 👤 Jon J. Mingo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 11:49
CPC Classifications
G; G10; G10K; G10K11/00; G10K11/002
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
78 words
An ultrasonic detection apparatus comprising: a transducer for generating ultrasonic signals, a lens unit having a lens, said lens having a sidewall, said lens being arranged to focus the ultrasonic signals from said transducer, and a damping ring, said damping ring being adjacent to said lens unit and angled away from said lens sidwall forming a small opening therebetween, wherein stray noise or energy in sid lens unit enters said damping ring rather than returning to said transducer.
Claim 2
Dependent Claim
78 words
An ultrasonic detection apparatus comprising: a transducer for generating ultrasonic signals, a lens unit having a lens, said lens having a sidewall, said lens being arranged to focus the ultrasonic signals from said transducer, and a damping ring, said damping ring being adjacent to said lens unit and angled away from said lens sidwall forming a small opening therebetween, wherein stray noise or energy in sid lens unit enters said damping ring rather than returning to said transducer.
Claim 3
Dependent Claim
25 words
The apparatus of claim 1 wherein the acoustic impedance of said damping ring is approximately the same as the acoustic impedance of said lens unit.
Claim 4
Dependent Claim
25 words
The apparatus of claim 1 wherein the speed of sound in said damping ring is less than the speed of sound in said lens unit.
Claim 5
Dependent Claim
13 words
The apparatus of claim 1 wherein said damping ring is made of Teflon®.
Claim 6
Dependent Claim
14 words
The apparatus of claim 4 wherein said lens unit is made of polymethyl methacrylate.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1989-08-25 | 1990-02-24 | 1990-08-26 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-08-25 | 1994-02-24 | 1994-08-26 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-08-25 | 1998-02-24 | 1998-08-26 | $7700.00 | Window Closed / Lapsed |