US3121853A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hygrometric elements
Assignee: TORRY RES STATION
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Filing: 1961-03-29
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Granted: 1964-02-18
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Expires: 1981-03-29
Abstract
No abstract record available.
Inventors
- 👤 Jason Alfred Charles
- 👤 Lees Alexander
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 14:30
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/22; G01N27/223; G01N27/225; G01N27/04; G01N27/12; G01N27/121
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
80 words
A METHOD OF IMPROVING THE AGEING PROPERTIES OF HYGROMETRIC ELEMENT COMPRISING A BASE ELECTRODE OF ALUMINIUM, A LAYER THEREON OF ALUMINIUM OXIDE PRODUCED BY ELECTROLYTIC OXIDATION USING SULPHURIC ACID, AND AN OUTER POROUS ELECTRODE, IN WHICH THE ELEMENT IS STORED FOR THREE TO SIX MONTHS AT NORMAL ROOM HUMIDITY AND TEMPERATURE, AND THEN DIPPED FOR A PERIOD NOT LESS THAN A SECOND AND NOT MORE THAN A MINUTE IN A SATURATED SOLUTION OF A SALT CONTAINING LARGE OR HEAVY ANIONS.
Claim 2
Independent Claim
80 words
A METHOD OF IMPROVING THE AGEING PROPERTIES OF HYGROMETRIC ELEMENT COMPRISING A BASE ELECTRODE OF ALUMINIUM, A LAYER THEREON OF ALUMINIUM OXIDE PRODUCED BY ELECTROLYTIC OXIDATION USING SULPHURIC ACID, AND AN OUTER POROUS ELECTRODE, IN WHICH THE ELEMENT IS STORED FOR THREE TO SIX MONTHS AT NORMAL ROOM HUMIDITY AND TEMPERATURE, AND THEN DIPPED FOR A PERIOD NOT LESS THAN A SECOND AND NOT MORE THAN A MINUTE IN A SATURATED SOLUTION OF A SALT CONTAINING LARGE OR HEAVY ANIONS.
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) | 1967-02-17 | 1967-08-19 | 1968-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-02-17 | 1971-08-19 | 1972-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-02-17 | 1975-08-19 | 1976-02-18 | $7700.00 | Window Closed / Lapsed |