Patent US3663841A successfully refreshed from Google Patents.
US3663841A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrasonic transducers
Assignee: TAI PAN Corp Inc
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Filing: 1970-04-22
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Granted: 1972-05-16
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Expires: 1990-04-22
Abstract
Abstract An ultrasonic transducer which includes a piezo-electric element of annular form having electrodes provided upon its inner and outer curved surfaces to permit the crystal to be vibrated in the circumferential mode, wherein a radiating member in the form of a cup or tube closed at one end is fitted to the annulus, support means being attached to the bottom of the cup or tube.
Inventors
- 👤 Joseph Donald Parker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 17:07
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0644; B06B1/0655
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
207 words
A transducer for radiating ultrasonic power when energized by an electrical signal of ultrasonic frequency, comprising, in combination: a piezoelectric element having an annular shape; electrodes provided upon the inner and the outer curved surfaces of said piezoelectric element to permit said element to be vibrated in a circumferential mode when said electrical signal is applied to said electrodes; a radiating member having the shape of a truncated cone with a continuous conical portion closed at one end thereof by a flat portion unitary and integral with said conical portion and open at the other end thereof with a free unsupported periphery; said annular piezoelectric element being in direct contact with said continuous conical portion of said radiating member between said unitary integral flat portion and said free unsupported periphery in an annular line of contact whereby said radiating member may be caused to resonate at said ultrasonic frequency with said unsupported periphery positioned at an antinode; said annular line of contact being disposed in a plane substantially parallel to a plane containing said unitary integral flat portion of said radiating member; and support means attached to said closed end of said radiating member at a node on said unitary integral flat portion of said radiating member.
Claim 2
Dependent Claim
207 words
A transducer for radiating ultrasonic power when energized by an electrical signal of ultrasonic frequency, comprising, in combination: a piezoelectric element having an annular shape; electrodes provided upon the inner and the outer curved surfaces of said piezoelectric element to permit said element to be vibrated in a circumferential mode when said electrical signal is applied to said electrodes; a radiating member having the shape of a truncated cone with a continuous conical portion closed at one end thereof by a flat portion unitary and integral with said conical portion and open at the other end thereof with a free unsupported periphery; said annular piezoelectric element being in direct contact with said continuous conical portion of said radiating member between said unitary integral flat portion and said free unsupported periphery in an annular line of contact whereby said radiating member may be caused to resonate at said ultrasonic frequency with said unsupported periphery positioned at an antinode; said annular line of contact being disposed in a plane substantially parallel to a plane containing said unitary integral flat portion of said radiating member; and support means attached to said closed end of said radiating member at a node on said unitary integral flat portion of said radiating member.
Claim 3
Dependent Claim
24 words
A transducer for radiating ultrasonic power in accordance with claim 1, wherein said radiating member is in an interference fit in said piezoelectric element.
Claim 4
Dependent Claim
72 words
A transducer for radiating ultrasonic power in accordance with claim 1, wherein, said radiating member is fitted in said piezoelectric element, and said piezoelectric element is fitted into a second radiating member having the shape of a truncated cone with a continuous conical portion closed at one end thereof by a flat portion unitary and integral with said conical portion and open at the other end thereof with a free unsupported periphery.
Claim 5
Dependent Claim
34 words
A transducer for radiating ultrasonic power in accordance with claim 3, wherein a vibration absorber couples the closed ends of both said radiating members with said piezoelectric element disposed between both said radiating members.
Claim 6
Dependent Claim
29 words
A transducer for radiating ultrasonic power in accordance with claim 4, wherein said vibration absorber is attached at a node on said closed end of each said radiating member.
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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) | 1975-05-16 | 1975-11-15 | 1976-05-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-05-16 | 1979-11-15 | 1980-05-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-05-16 | 1983-11-15 | 1984-05-16 | $7700.00 | Window Closed / Lapsed |