US3083573A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrical hygrometers
Assignee: Individual
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Filing: 1960-06-21
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Granted: 1963-04-02
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Expires: 1980-06-21
Abstract
No abstract record available.
Inventors
- 👤 John L Shaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:08
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/22; G01N27/223; G01N27/225
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
117 words
A HUMIDITY-SENSITIVE ELEMENT FOR A HYGROMETER, COMPRISING AN ALUMINIUM BASE PROVIDED WITH AN OXIDIZED POROUS SURFACE LAYER OF ALUMINIUM OXIDE, SAID SURFACE LAYER HAVING PORES WHICH EXTEND PARTLY THROUGH IT FROM ITS OUTER FACE, SAID PORES BEING PARTLY FILLED WITH AN AQUEOUS SUBSTANTIALLY SATURATED SOLUTION OF A HYGROSCOPIC SUBSTANCE, AND IMMEDIATELY OVER SAID LIQUID-TREATED LAYER A CONTINUOUS COVERING CONSISTING OF A WATER-VAPOUR-PERMEABLE LAYER OF ELECTRICALLY CONDUCTIVE MATERIAL WHEREBY THE ELECTRICAL CAPACITANCE BETWEEN THE BASE AND THE WATERPERMEABLE ELECTRICALLY CONDUCTIVE LAYER VARIES WITH THE HUMIDITY TO WHICH THE WATER-PERMEABLE LAYER IS EXPOSED, SAID PARTIALLY FILLED PORES PERMITTING THE RELEASE AND PICKING UP WATER VAPOR TO THE LIQUID IN THE PORES BY THE VAPOR TRANSMITTED THROUGH SAID COVERING LAYER.
Claim 2
Dependent Claim
117 words
A HUMIDITY-SENSITIVE ELEMENT FOR A HYGROMETER, COMPRISING AN ALUMINIUM BASE PROVIDED WITH AN OXIDIZED POROUS SURFACE LAYER OF ALUMINIUM OXIDE, SAID SURFACE LAYER HAVING PORES WHICH EXTEND PARTLY THROUGH IT FROM ITS OUTER FACE, SAID PORES BEING PARTLY FILLED WITH AN AQUEOUS SUBSTANTIALLY SATURATED SOLUTION OF A HYGROSCOPIC SUBSTANCE, AND IMMEDIATELY OVER SAID LIQUID-TREATED LAYER A CONTINUOUS COVERING CONSISTING OF A WATER-VAPOUR-PERMEABLE LAYER OF ELECTRICALLY CONDUCTIVE MATERIAL WHEREBY THE ELECTRICAL CAPACITANCE BETWEEN THE BASE AND THE WATERPERMEABLE ELECTRICALLY CONDUCTIVE LAYER VARIES WITH THE HUMIDITY TO WHICH THE WATER-PERMEABLE LAYER IS EXPOSED, SAID PARTIALLY FILLED PORES PERMITTING THE RELEASE AND PICKING UP WATER VAPOR TO THE LIQUID IN THE PORES BY THE VAPOR TRANSMITTED THROUGH SAID COVERING LAYER.
Claim 3
Independent Claim
111 words
A METHOD OF MANUFACTURING A HUMIDITY-SENSITIVE ELEMENT FOR A HYGROMETER, WHICH METHOD INCLUDES THE STEPS OF ANODIZING AN ALUMINIUM METAL BASE TO FORM A THIN POROUS ALUMINIUM OXIDE LAYER THEREON, APPLYING TO THE SURFACE OF SAID ANODIZED LAYER A VERY THIN LAYER OF THE ORDER OF MICRONS OF AN AQUEOUS SUBSTANTIALLY SATURATED SOLUTION OF A HYGROSCOPIC SUBSTANCE TO PARTLY FILL THE PORES OF THE ANODIZED LAYER AND THEREAFTER COVERING WITH AQUEOUS TREATED ALUMINIUM OXIDE LAYER PARTLY FILLED WITH AQUEOUS HYGROSCOPIC SUBSTANCE WITH A WATER-VAPOUR-PERMEABLE ELECTRICALLY CONDUCTING LAYER WHEREBY THE ELECTRICAL CAPACITANCE BETWEEN THE BASE AND THE WATER-PERMEABLE ELECTRICALLY CONDUCTIVE LAYER VARIES WITH THE HUMIDITY TO WHICH THE WATER-PERMEABLE LAYER IS EXPOSED.
Claim 4
Independent Claim
111 words
A METHOD OF MANUFACTURING A HUMIDITY-SENSITIVE ELEMENT FOR A HYGROMETER, WHICH METHOD INCLUDES THE STEPS OF ANODIZING AN ALUMINIUM METAL BASE TO FORM A THIN POROUS ALUMINIUM OXIDE LAYER THEREON, APPLYING TO THE SURFACE OF SAID ANODIZED LAYER A VERY THIN LAYER OF THE ORDER OF MICRONS OF AN AQUEOUS SUBSTANTIALLY SATURATED SOLUTION OF A HYGROSCOPIC SUBSTANCE TO PARTLY FILL THE PORES OF THE ANODIZED LAYER AND THEREAFTER COVERING WITH AQUEOUS TREATED ALUMINIUM OXIDE LAYER PARTLY FILLED WITH AQUEOUS HYGROSCOPIC SUBSTANCE WITH A WATER-VAPOUR-PERMEABLE ELECTRICALLY CONDUCTING LAYER WHEREBY THE ELECTRICAL CAPACITANCE BETWEEN THE BASE AND THE WATER-PERMEABLE ELECTRICALLY CONDUCTIVE LAYER VARIES WITH THE HUMIDITY TO WHICH THE WATER-PERMEABLE LAYER IS EXPOSED.
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) | 1966-04-01 | 1966-10-01 | 1967-04-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-01 | 1970-10-01 | 1971-04-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-01 | 1974-10-01 | 1975-04-02 | $7700.00 | Window Closed / Lapsed |