US4025892A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Probe for detecting gaseous polar molecules such as water vapor
Assignee: US Philips Corp
•
Filing: 1975-05-13
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Granted: 1977-05-24
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Expires: 1995-05-13
Abstract
Abstract Probe for selectively detecting polar molecules in a gaseous atmosphere in contact with the probe, characterized by a layer of semiconductor material covered by a film of dielectric material.
Inventors
- 👤 Jean Pompei
- 👤 Bernard Lacroix
- 👤 Francis Pierrot
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:40
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; G01N27/129; G01N27/121
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
96 words
Probe for selectively detecting polar molecules in a gaseous mixture in contact with the probe, the operation of the probe being based on the variation of its electrical resistance due to a reaction at the probe surface, characterized in that it comprises a substrate on which is deposited a layer of a semiconductor material of thickness 0.05 to 0.08 μm to which are connected at least two electrodes and which is covered by a film of a dielectric material of thickness 0.01 to 0.04 μm at least part of which is active as a detection area.
Claim 2
Dependent Claim
96 words
Probe for selectively detecting polar molecules in a gaseous mixture in contact with the probe, the operation of the probe being based on the variation of its electrical resistance due to a reaction at the probe surface, characterized in that it comprises a substrate on which is deposited a layer of a semiconductor material of thickness 0.05 to 0.08 μm to which are connected at least two electrodes and which is covered by a film of a dielectric material of thickness 0.01 to 0.04 μm at least part of which is active as a detection area.
Claim 3
Dependent Claim
16 words
Probe as claimed in claim 1, characterized in that the said semiconductor compound is zinc oxide.
Claim 4
Dependent Claim
14 words
Probe as claimed in claim 1, characterized in that the dielectric material is tetraethoxysilane.
Claim 5
Dependent Claim
18 words
Probe as claimed in claim 3 having continuous sensitivity, characterized in that the dielectric layer is polycondensed tetraethoxysilane.
Claim 6
Dependent Claim
27 words
Probe as claimed in claim 3 having threshold sensitivity, characterized in that the dielectric layer consists of polycondensed tetraethoxysilane covered by a monomolecular layer of monomeric tetraethoxysilane.
Claim 7
Dependent Claim
21 words
Probe as claimed in claim 1 for detecting humidity and having threshold sensitivity, characterized in that the dielectric material is polytetrafluoroethylene.
References Cited (Backward Citations)
US3242007A
Cited
US3864659A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-05-23 | 1980-11-22 | 1981-05-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-05-23 | 1984-11-22 | 1985-05-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-05-23 | 1988-11-22 | 1989-05-24 | $7700.00 | Window Closed / Lapsed |