US3209181A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Temperature-independent transducer
Assignee: US Philips Corp
•
Filing: 1962-09-11
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Granted: 1965-09-28
•
Expires: 1982-09-11
Abstract
No abstract record available.
Inventors
- 👤 Frank G Brockman
- 👤 Paul W Beck
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 05:28
CPC Classifications
C; C04; C04B; C04B35/00; C04B35/01; C04B35/26; C04B35/265
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
87 words
A TRANDSUCER ELEMENT FOR CONVERTIN GMAGNETIC ENERGY INTO MECHANICAL ENERGY AND VICE VERSA COMPRISING A COMPOSITE BODY CONSISTING OF A PLURALITY OF INTERGRALLY UNITED LAYERS EACH OF A FERROMAGENTIC FERRITE MATERILA HAVING A LARGE ELECTROMECHANICAL COUPLING COEFFICEINT, EACH OF SAID LAYERS HAVING A GIVEN TEMPERATURE VARIATION OF THE ELECTROMECHIANICAL COUPLING COEFFICIENT WHICH DIFFERS FROM THAT OF THE OTHER LAYERS, THE TEMPERATURE VARIATION OF THE ELECTROMECHANICAL COUPLING COEFFICIENT OF THE LAYERS HAVING VALUES AT WHICH THE ELECTROMECHANICAL COUPLING COEFFICIENT IS SUBSTANTIALLY INDEPENDENT OF TEMEPRATURE OVER ITS OPERATING RANGE.
References Cited (Backward Citations)
US2227268A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-09-27 | 1969-03-29 | 1969-09-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-09-27 | 1973-03-29 | 1973-09-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-09-27 | 1977-03-29 | 1977-09-28 | $7700.00 | Window Closed / Lapsed |