US4240004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Ultrasonic transducer with chemical-setting inorganic cement backing for operation at high temperatures
Assignee: CALDON Co LP
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Filing: 1978-09-20
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Granted: 1980-12-16
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Expires: 1998-09-20
Abstract
Abstract A transducer unit which includes a backing member formulated from a water activated ceramic to which is added a powdered metal.
Inventors
- 👤 Robert L. Coleman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:56
CPC Classifications
B; B06; B06B; B06B1/00; B06B1/02; B06B1/06; B06B1/0644; B06B1/0662; B06B1/0681; B06B1/0685; G; G10; G10K; G10K11/00; G10K11/002; Y; Y10; Y10T; Y10T29/00; Y10T29/42
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
69 words
A transducer for high temperature operation comprising: (a) an active transducer element having front and rear active surfaces; (b) a backing member abutting said rear surface; (c) said backing member comprising a chemical-setting inorganic cement powder blended with a powdered metal and to which water has been added to bring about a chemical reaction resulting in the solidification of the blend, the blend being suitably dried and thereafter baked.
Claim 2
Dependent Claim
69 words
A transducer for high temperature operation comprising: (a) an active transducer element having front and rear active surfaces; (b) a backing member abutting said rear surface; (c) said backing member comprising a chemical-setting inorganic cement powder blended with a powdered metal and to which water has been added to bring about a chemical reaction resulting in the solidification of the blend, the blend being suitably dried and thereafter baked.
Claim 3
Dependent Claim
28 words
Apparatus according to claim 1 wherein: (a) the ratio of powdered metal to cement powder is approximately 11/2 to 2 parts metal powder to 1 part cement powder.
Claim 4
Dependent Claim
12 words
Apparatus according to claim 1 wherein: (a) said powdered metal is nickel.
Claim 5
Dependent Claim
58 words
Apparatus according to claim 1 which includes: (a) an elongated holder having an acoustic window at one end thereof; (b) said active transducer element being positioned adjacent said acoustic window with a relatively thin electrically insulating disc interposed between said active element and said acoustic window; (c) said blend cast directly on said active element in said holder.
Claim 6
Dependent Claim
15 words
Apparatus according to claim 1 wherein: (a) said cement powder is a modified-silicate base cement.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-16 | 1984-06-16 | 1984-12-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-16 | 1988-06-16 | 1988-12-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-16 | 1992-06-16 | 1992-12-16 | $7700.00 | Window Closed / Lapsed |