US3329587A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for measuring fluoride activity
Assignee: Henkel Corp
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Filing: 1963-07-03
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Granted: 1967-07-04
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Expires: 1983-07-03
Abstract
No abstract record available.
Inventors
- 👤 Steinbrecher Lester
- 👤 David Y Dollman
- 👤 Dwight E Buczkowski
- 👤 James W Harrison
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 22:55
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/404; G01N27/4045; C; C23; C23C; C23C22/00; C23C22/73; C23C22/77; G01N27/416; G01N27/49
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
101 words
A METHOD FRO MEASURING THE LEVEL OF FLUORIDE ACTIVITY IN ACIDIC AQUEOUS SOLUTION, IN THE RANGE OF FROM ABOUT 0.0 GRAM-IONS/LITER TO ABOUT 1.5 GRAM-IONS/LITER OF ACTIVE FLUORIDE, EXPRESSED AS FLUORIDE ION, COMPRISING IMMERSING A PAIR OF ELECTRODES, ONE OF WHICH COMPRISES A P-TYPE SILICON ELECTRODE OF CONSTANT PRESELECTED AREA AND THE OTHER OF WHICH COMPRISES AN INERT ELECTRODE IN SAID SOLUTION IN DARKNESS, PLACING A D.C. VOLTAGE OF FROM ABOUT 0.3 VOLT TO ABOUT 3.5 VOLTS FROM AN EXTERNAL VOLTAGE SOURCE ACROSS SAID ELECTRODES, WITH THE POSITIVE SIDE OF SAID VOLTAGE AT SAID SILICON ELECTRODE, MAINTAINING SAID VOLTAGE ACROSS THE
References Cited (Backward Citations)
US3219556A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-07-03 | 1971-01-02 | 1971-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-07-03 | 1975-01-02 | 1975-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-07-03 | 1979-01-02 | 1979-07-04 | $7700.00 | Window Closed / Lapsed |