Patent US5469436A successfully refreshed from Google Patents.
US3066221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Detector of free water in liquids of low water solubility
Assignee: Individual
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Filing: 1961-07-13
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Granted: 1962-11-27
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Expires: 1981-07-13
Abstract
No abstract record available.
Inventors
- 👤 Per T Thyrum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 21:31
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/62; G01N21/63; G01N21/64
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
84 words
THE METHOD OF DETERMINING THE PRESENCE OF WATER ABOVE SATURATION VALUE IN A LIQUID OF LOW WATER SOLUBILITY WHICH COMPRISES TREATING ONE SIDE OF AN ELEMENT WITH A METHANOL SOLUTION SATURATED WITH THE POTASSUM SALT OF FLUORESCEIN, SAID ELEMENT CONSISTING OF WHITE CIRCULAR UNSIZED CELLULOSIC MATERIAL, PASSING THE LIQUID THROUGH THE SAID ELEMENT AND OBSERVING UNDER ULTRAVIOLET LIGHT THE COLOR OF THE TREATED ELEMENT, WHEREBY THE PRESENCE OF THE WATER IS INDICATED BY A YELLOW-GREEN FLUORESCENE ON THE TREATED SIDE OF THE SAID ELEMENT.
Claim 2
Independent Claim
84 words
THE METHOD OF DETERMINING THE PRESENCE OF WATER ABOVE SATURATION VALUE IN A LIQUID OF LOW WATER SOLUBILITY WHICH COMPRISES TREATING ONE SIDE OF AN ELEMENT WITH A METHANOL SOLUTION SATURATED WITH THE POTASSUM SALT OF FLUORESCEIN, SAID ELEMENT CONSISTING OF WHITE CIRCULAR UNSIZED CELLULOSIC MATERIAL, PASSING THE LIQUID THROUGH THE SAID ELEMENT AND OBSERVING UNDER ULTRAVIOLET LIGHT THE COLOR OF THE TREATED ELEMENT, WHEREBY THE PRESENCE OF THE WATER IS INDICATED BY A YELLOW-GREEN FLUORESCENE ON THE TREATED SIDE OF THE SAID ELEMENT.
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) | 1965-11-26 | 1966-05-28 | 1966-11-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-11-26 | 1970-05-28 | 1970-11-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-11-26 | 1974-05-28 | 1974-11-27 | $7700.00 | Window Closed / Lapsed |