US3705375A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrode for electric humidity sensor
Assignee: PHYS CHEM RESEARCH CORP
•
Filing: 1971-07-07
•
Granted: 1972-12-05
•
Expires: 1991-07-07
Abstract
Abstract An electric humidity transducer includes a body member coated with a sensing layer having a resistivity responsive to ambient humidity and a pair of spaced thin electrodes adherent to the sensing layer. The electrodes each comprise a porous, flexible, polymeric resin, adhesive binder bonding a mixture of carbon black and graphite. The ratio of carbon black to graphite is between 2:8 and 6:4, and the electrode contains between 7 and 11 parts of the binder and 8 to 12 parts of the carbon black and graphite mixture.
Inventors
- 👤 Abe Hershler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 23:44
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/04; G01N27/12; G01N27/121
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
20 words
The sensing device of claim 1 wherein the weight ratio of carbon black to graphite is between 2:8 and 6:4.
Claim 2
Dependent Claim
34 words
The sensing device of claim 2 wherein said electrode contains between 8 and 12 parts by weight of said carbon black and graphite and between 7 and 11 parts by weight of said binder.
Claim 3
Dependent Claim
18 words
The sensing device of claim 2 wherein said electrode is of a thickness between 0.0005 and 0.006 inch.
Claim 4
Dependent Claim
11 words
The sensing device of claim 2 wherein said electrode is porous.
Claim 5
Dependent Claim
13 words
The sensing device of claim 2 wherein said binder comprises a polymeric resin.
Claim 6
Dependent Claim
14 words
The sensing device of claim 6 wherein said polymeric resin comprises a cellulose derivative.
Claim 7
Dependent Claim
23 words
The sensing device of claim 2 comprising a contact element secured to said sensing device and having a gold face engaging said electrode.
Claim 8
Dependent Claim
22 words
The sensing device of claim 2 including a pair of said electrodes adherent to said substrate and being separated from each other.
Claim 9
Dependent Claim
29 words
The sensing device of claim 2 including a body member, said substrate comprising a layer superimposed on said body member and comprising an ion exchange resin or lithium chloride.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-12-05 | 1976-06-05 | 1976-12-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-05 | 1980-06-05 | 1980-12-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-05 | 1984-06-05 | 1984-12-05 | $7700.00 | Window Closed / Lapsed |