US4052691A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Humidity sensor
Assignee: AGC Inc
•
Filing: 1976-05-14
•
Granted: 1977-10-04
•
Expires: 1996-05-14
Abstract
Abstract A humidity sensor comprising a pair of spaced electrodes on an insulating substrate is formed by coating an orthophosphate as a sensitive membrane over at least a portion of the gap between the electrodes.
Inventors
- 👤 Kentaro Nagano
- 👤 Koji Nomaki
- 👤 Yukinori Kutsukake
- 👤 Junji Nanao
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 07:25
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; G01N27/121
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
37 words
A humidity sensor for detecting condensed moisture, which comprises: a pair of spaced electrodes disposed on an insulating substrate; and a moisture sensitive membrane of an orthophosphate which at least partially covers the gap between said electrodes.
Claim 2
Dependent Claim
37 words
A humidity sensor for detecting condensed moisture, which comprises: a pair of spaced electrodes disposed on an insulating substrate; and a moisture sensitive membrane of an orthophosphate which at least partially covers the gap between said electrodes.
Claim 3
Dependent Claim
29 words
The humidity sensor according to claim 1, wherein the orthophosphate is selected from the group consisting of orthophosphates of zinc, lead, lithium, manganese, calcium, magnesium, iron and mixtures thereof.
Claim 4
Dependent Claim
13 words
The humidity sensor according to claim 1, wherein the orthophosphate is zinc orthophosphate.
Claim 5
Dependent Claim
20 words
The humidity sensor according to claim 1, wherein the membrane of the orthophosphate has a thickness of 10 to 500μ.
Claim 6
Dependent Claim
22 words
The humidity sensor according to claim 1, wherein the orthophosphate is coated on said insulating substrate by a plasma flame spraying method.
Claim 7
Dependent Claim
21 words
The humidity sensor according to claim 1, wherein the orthophosphate is coated on said insulating substrate and heated at high temperature.
Claim 8
Dependent Claim
20 words
The humidity sensor according to claim 1, wherein the orthophosphate is coated on said insulating substrate by a sintering method.
Claim 9
Dependent Claim
21 words
The humidity sensor according to claim 1, wherein the orthophosphate is coated on said insulating substrate by a vacuum deposition method.
Claim 10
Dependent Claim
20 words
The humidity sensor according to claim 1, wherein the orthophosphate is coated on said insulating substrate by a spattering method.
Claim 11
Dependent Claim
77 words
A defogging glass plate, which comprises: an insulating substrate deposited on a glass plate to be defogged; a humidity sensor on said insulating substrate which comprises a pair of spaced electrodes with a moisture sensitive membrane of an orthophosphate at least partially covering the gap between said spaced electrodes; and an electric heating element connected to said humidity sensor, such that activation of said electric heating element is controlled by variation of the impedance between said electrodes.
Claim 12
Dependent Claim
77 words
A defogging glass plate, which comprises: an insulating substrate deposited on a glass plate to be defogged; a humidity sensor on said insulating substrate which comprises a pair of spaced electrodes with a moisture sensitive membrane of an orthophosphate at least partially covering the gap between said spaced electrodes; and an electric heating element connected to said humidity sensor, such that activation of said electric heating element is controlled by variation of the impedance between said electrodes.
References Cited (Backward Citations)
US2806991A
Cited
US3868492A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-03 | 1981-04-04 | 1981-10-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-03 | 1985-04-04 | 1985-10-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-03 | 1989-04-04 | 1989-10-04 | $7700.00 | Window Closed / Lapsed |