Patent US4229979A successfully refreshed from Google Patents.
US4229979A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Transducer and method of making the same
Assignee: International Standard Electric Corp
•
Filing: 1979-05-29
•
Granted: 1980-10-28
•
Expires: 1999-05-29
Abstract
Abstract A silicon transducer including a silicon frame with one or more lands extending from a diaphragm or the like. The lands are interconnected by two thin strips formed integrally with the lands. The strips are essentially the transducer. The transducer is constructed by etching a boron doped wafer with a mixture of catechol, ethylene diamine and water.
Inventors
- 👤 John C. Greenwood
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:18
CPC Classifications
H; H10; H10D; H10D48/00; H10D48/50; G; G01; G01L; G01L9/00; G01L9/0001; G01L9/0008; G01L9/0019; G01L9/0041; G01L9/0042; Y; Y10; Y10S; Y10S438/00; Y10S438/928
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
105 words
A pressure transducer comprising: a flexible diaphragm supported in a frame of the same material as the diaphragm; first and second lands extending from one surface of said diaphragm; a plurality of filaments stretched and fixed between said lands; and means to vibrate said filaments at their respective resonant frequencies as determined by the configuration of said diaphragm, movement of said diaphragm producing movements of said lands toward and away from each other, said movements respectively causing stresses, strains and therefore lengthwise contractions and elongations of said filaments and thereby respective lowering and raising of the tensions in and the resonant frequencies of said filaments.
Claim 2
Dependent Claim
105 words
A pressure transducer comprising: a flexible diaphragm supported in a frame of the same material as the diaphragm; first and second lands extending from one surface of said diaphragm; a plurality of filaments stretched and fixed between said lands; and means to vibrate said filaments at their respective resonant frequencies as determined by the configuration of said diaphragm, movement of said diaphragm producing movements of said lands toward and away from each other, said movements respectively causing stresses, strains and therefore lengthwise contractions and elongations of said filaments and thereby respective lowering and raising of the tensions in and the resonant frequencies of said filaments.
Claim 3
Dependent Claim
13 words
A transducer as claimed in claim 1, in which said material is silicon.
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) | 1983-10-28 | 1984-04-28 | 1984-10-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-10-28 | 1988-04-28 | 1988-10-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-10-28 | 1992-04-28 | 1992-10-28 | $7700.00 | Window Closed / Lapsed |