US4345301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capacitive humidity transducer
Assignee: Honeywell Inc
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Filing: 1981-02-23
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Granted: 1982-08-17
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Expires: 2001-02-23
Abstract
Abstract A capacitive humidity transducer having an electrically non-conductive dielectric base carrying a pair of electrically conductive coatings deposited directly on opposite respective sides of the non-conductive base to form parallel capacitor plates. The conductive coatings are each arranged in a configuration of a plurality of side-by-side forked legs with the legs of the electrically conductive elements being positioned in a facing relationship. One end of each of the electrically conductive coatings is provided with electrical connectors for attaching the transducer to respective electrically conductive circuits which may be on a printed circuit board. The dielectric base is arranged to be hygroscopic whereby atmospheric humidity provides a corresponding variation in the dielectric constant of the base to affect the capacitance of the transducer.
Inventors
- 👤 Marvin D. Nelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 10:20
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/22; G01N27/223; G01N27/225
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
176 words
A capacitive humidity transducer comprising an electrically non-conductive base member of a hygroscopic material, a first electrically conductive coating on said base member arranged as a plurality of side-by-side extensions joined at one end to a common electrically conductive strip, a second electrically conductive coating on said base member arranged as a plurality of side-by-side extensions joined at one end to a common electrically conductive strip and located on the opposite side of said base member from said first coating with said extensions of said first and second coatings being arranged in a facing relationship, said base member and said extensions forming a capacitor affected by atmospheric humidity as a result of the hygroscopic activity of said base member, a first electrical connector for said first coating, a second electrical connector for said second coating and a printed circuit board having a first circuit thereon receiving said first connector and a second circuit thereon receiving said second connector, said first and second circuits being spaced closer together than the spacing of said first and second connectors.
Claim 2
Dependent Claim
176 words
A capacitive humidity transducer comprising an electrically non-conductive base member of a hygroscopic material, a first electrically conductive coating on said base member arranged as a plurality of side-by-side extensions joined at one end to a common electrically conductive strip, a second electrically conductive coating on said base member arranged as a plurality of side-by-side extensions joined at one end to a common electrically conductive strip and located on the opposite side of said base member from said first coating with said extensions of said first and second coatings being arranged in a facing relationship, said base member and said extensions forming a capacitor affected by atmospheric humidity as a result of the hygroscopic activity of said base member, a first electrical connector for said first coating, a second electrical connector for said second coating and a printed circuit board having a first circuit thereon receiving said first connector and a second circuit thereon receiving said second connector, said first and second circuits being spaced closer together than the spacing of said first and second connectors.
Claim 3
Dependent Claim
18 words
A capacitive humidity transducer as set forth in claim 1 wherein said first and second coatings are copper.
Claim 4
Dependent Claim
18 words
A capacitive humidity transducer as set forth in claim 2 wherein said base member is a polyimide film.
Claim 5
Dependent Claim
26 words
A capacitive humidity transducer as set forth in claim 1 wherein said extensions of said first and second coatings are each at least three in number.
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) | 1985-08-16 | 1986-02-15 | 1986-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1989-08-16 | 1990-02-15 | 1990-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1993-08-16 | 1994-02-15 | 1994-08-17 | $7700.00 | Window Closed / Lapsed |