Patent US4276537A successfully refreshed from Google Patents.
US4276537A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Moisture-responsive resistor element
Assignee: Sanyo Silicon Electronics Co Ltd
•
Filing: 1979-12-18
•
Granted: 1981-06-30
•
Expires: 1999-12-18
Abstract
Abstract A moisture-responsive resistor element comprising, as a moisture-responsive resistance material, metastannic acid alone or in combination with tin dioxide.
Inventors
- 👤 Hiroshi Shimizu
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 12:28
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; G01N27/121
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
25 words
A moisture-responsive resistor element of the direct current driving type for measurement of the relative humidity, which comprises metastannic acid as a moisture-responsive resistance material.
Claim 2
Dependent Claim
25 words
A moisture-responsive resistor element of the direct current driving type for measurement of the relative humidity, which comprises metastannic acid as a moisture-responsive resistance material.
Claim 3
Dependent Claim
23 words
A moisture-responsive resistor element as set forth in claim 1 wherein the moisture-responsive resistance material comprises tin dioxide in combination with metastannic acid.
Claim 4
Dependent Claim
29 words
A moisture-responsive resistor element as set forth in claim 2 wherein the amount of tin dioxide is 2 parts by weight per 5 parts by weight of metastannic acid.
Claim 5
Dependent Claim
33 words
A moisture-responsive resistor element as set forth in claim 2 wherein a film of tin dioxide is formed on an insulating substrate and a layer of metastannic acid is formed on said film.
Claim 6
Dependent Claim
22 words
A moisture-responsive resistor element as set forth in claim 2 wherein the outer surface of the element is covered with metastannic acid.
References Cited (Backward Citations)
US4086556A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1984-06-29 | 1984-12-29 | 1985-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-29 | 1988-12-29 | 1989-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-29 | 1992-12-29 | 1993-06-30 | $7700.00 | Window Closed / Lapsed |