Patent US4751013A successfully refreshed from Google Patents.
US4751013A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Porous piezoelectric material and method for making it
Assignee: Siemens AG
•
Filing: 1985-07-26
•
Granted: 1988-06-14
•
Expires: 2005-07-26
Abstract
Abstract A piezoelectric ceramic powder is, together with a binder, processed to a granulate. This granulate is mixed with a pearl polymer to a mixture. The mixture is pressed to a suitable shape, and then in a first firing step the binder and the pearl polymer are fired out. Preferably the first firing process is followed by a second firing step for sintering. Thereafter mechanical fabrication may take place, to give the end product its shape. The firing out of the pearl polymer results in a porous piezoelectric ceramic, with which, when used in an ultrasonic transducer, a high transducer effectiveness, sharp ultrasonic pulses with little edge radiation as well as a good electric and acoustic adaptation can be achieved.
Inventors
- 👤 Hans Kaarmann
- 👤 Karl Lubitz
- 👤 Jutta Mohaupt
- 👤 Martina Vogt
- 👤 Wolfram Wersing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 22:31
CPC Classifications
C; C04; C04B; C04B38/00; C04B38/06; C04B38/063; C04B38/0635; C04B38/0645; C04B38/067; H; H10; H10N; H10N30/00; H10N30/01; H10N30/09; H10N30/092; H10N30/093; H10N30/097; C04B2111/00; C04B2111/00474; C04B2111/00844
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
49 words
A method for producing a porous ceramic material, comprising the steps of: mixing a pearl polymer having a diameter between 10 μm and 40 μm with powdered piezoelectric ceramic material; and firing the ceramic material mixture with burning out of the pearl polymer to form a porous ceramic material.
Claim 2
Independent Claim
49 words
A method for producing a porous ceramic material, comprising the steps of: mixing a pearl polymer having a diameter between 10 μm and 40 μm with powdered piezoelectric ceramic material; and firing the ceramic material mixture with burning out of the pearl polymer to form a porous ceramic material.
Claim 3
Dependent Claim
17 words
The method of claim 1, further comprising the step of shaping the mixture before said firing step.
Claim 4
Dependent Claim
19 words
The method of claim 1, wherein the piezoelectric ceramic material is in a slip form during said mixing step.
Claim 5
Dependent Claim
20 words
The method of claim 1, wherein the pearl polymer is in a slip or suspension form during said mixing step.
Claim 6
Dependent Claim
27 words
The method of claim 1, further comprising the step added of further firing the porous ceramic material to form a sintered mixture after said first firing step.
Claim 7
Dependent Claim
21 words
The method of claim 1, wherein said mixing step is carried out using 10% to 50% of pearl polymer by mass.
Claim 8
Dependent Claim
21 words
The method of claim 5, further comprising the step of polarizing the mixture after subjecting it to said further firing step.
Claim 9
Dependent Claim
24 words
The method of claim 7, further comprising the step of introducing an electrically nonconductive gas into the porous ceramic material during said polarizing step.
Claim 10
Dependent Claim
9 words
The product produced by the process of claim 1.
References Cited (Backward Citations)
DD83530A
Cited
US2430013A
Cited
FR900298A
Cited
US2996389A
Cited
US3258349A
Cited
US3470276A
Cited
JPS4877397A
Cited
DD131643A1
Cited
US4230589A
Cited
US4217684A
Cited
GB2052917A
Cited
US4234558A
Cited
US4563432A
Cited
DE3309218A1
Cited
DE3309236A1
Cited
DE3309234A1
Cited
EP0119855A2
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-06-14 | 1991-12-14 | 1992-06-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-06-14 | 1995-12-14 | 1996-06-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-06-14 | 1999-12-14 | 2000-06-14 | $7700.00 | Window Closed / Lapsed |