US3406572A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pressure transducer
Assignee: Individual
•
Filing: 1964-11-25
•
Granted: 1968-10-22
•
Expires: 1984-11-25
Abstract
No abstract record available.
Inventors
- 👤 Jean J A Robillard
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 04:19
CPC Classifications
G; G01; G01L; G01L21/00
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
107 words
A PRESSURE TRANSDUCER, COMPRISING A THIN FILM OF SEMI-CONDUCTOR MATERIAL CONTAINING AN ACCEPTOR IMPURITY, THE THICKNESS OF SAID THIN FILM BEING SUCH THAT THE ADSORPTION OF GAS MOLECULES ON THE SURFACE OF SAID THIN FILM SUBSTANTIALLY AFFECTS THE RESISTANCE THEREOF, AT LEAST ONE SURFACE OF SAID FILM BEING EXPOSED TO SAID GAS, AND ELECTRODE MEANS FOR PASSING A CURRENT THROUGH A PORTION OF SAID SEMI-CONDUCTOR MATERIAL IN WHICH MOLECULES OF SAID GAS HAVE BEEN ADSORBED, WHEREBY THE PRESSURE OF SAID GAS MAY BE MEASURED AS A FUNCTION OF THE CONDUCTIVITY OF SAID SEMI-CONDUCTOR PORTION DUE TO THE EXCHANGE OF ELECTRONS BETWEEN SAID ADSORDED MOLECULES AND ACCEPTOR MATERIAL.
Claim 2
Dependent Claim
107 words
A PRESSURE TRANSDUCER, COMPRISING A THIN FILM OF SEMI-CONDUCTOR MATERIAL CONTAINING AN ACCEPTOR IMPURITY, THE THICKNESS OF SAID THIN FILM BEING SUCH THAT THE ADSORPTION OF GAS MOLECULES ON THE SURFACE OF SAID THIN FILM SUBSTANTIALLY AFFECTS THE RESISTANCE THEREOF, AT LEAST ONE SURFACE OF SAID FILM BEING EXPOSED TO SAID GAS, AND ELECTRODE MEANS FOR PASSING A CURRENT THROUGH A PORTION OF SAID SEMI-CONDUCTOR MATERIAL IN WHICH MOLECULES OF SAID GAS HAVE BEEN ADSORBED, WHEREBY THE PRESSURE OF SAID GAS MAY BE MEASURED AS A FUNCTION OF THE CONDUCTIVITY OF SAID SEMI-CONDUCTOR PORTION DUE TO THE EXCHANGE OF ELECTRONS BETWEEN SAID ADSORDED MOLECULES AND ACCEPTOR MATERIAL.
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) | 1971-10-22 | 1972-04-22 | 1972-10-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-10-22 | 1976-04-22 | 1976-10-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-10-22 | 1980-04-22 | 1980-10-22 | $7700.00 | Window Closed / Lapsed |