US3129148A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for measuring fluoride activity
Assignee: Henkel Corp
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Filing: 1962-11-08
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Granted: 1964-04-14
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Expires: 1982-11-08
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
2026-10-28 20:00
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/26; G01N27/403; G01N27/404; G01N27/4045; G01N27/416; G01N27/49; Y; Y10; Y10T; Y10T137/00; Y10T137/0318; Y10T137/0324; Y10T137/0329; Y10T137/034; Y10T436/00; Y10T436/19
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
65 words
A METHOD FOR MEASURING FLUORIDE ACTIVITY IN A SOLUTION COMPRISING IMMERSING A PAIR OF ELECTRODES, ONE OF WHICH COMPRISES AN N-TYPE SILICON ELECTRODE, IN SAID SOLUTION, DIRECTING LIGHT HAVING A CONSTANT INTENSITY AND SPECTRAL DISTRIBUTION ON SAID SILICON ELECRODE, PLACING A D.C. VOLTAGE ACROSS SAID ELECTRODES, WITH THE POSITIVE SIDE OF SAID VOLTAGE AT SAID SILICON ELECTRODE, AND MEASURING THE CURRENT PASSING BETWEEN SAID ELECTRODES.
Claim 2
Independent Claim
65 words
A METHOD FOR MEASURING FLUORIDE ACTIVITY IN A SOLUTION COMPRISING IMMERSING A PAIR OF ELECTRODES, ONE OF WHICH COMPRISES AN N-TYPE SILICON ELECTRODE, IN SAID SOLUTION, DIRECTING LIGHT HAVING A CONSTANT INTENSITY AND SPECTRAL DISTRIBUTION ON SAID SILICON ELECRODE, PLACING A D.C. VOLTAGE ACROSS SAID ELECTRODES, WITH THE POSITIVE SIDE OF SAID VOLTAGE AT SAID SILICON ELECTRODE, AND MEASURING THE CURRENT PASSING BETWEEN SAID ELECTRODES.
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) | 1967-04-14 | 1967-10-14 | 1968-04-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1971-04-14 | 1971-10-14 | 1972-04-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1975-04-14 | 1975-10-14 | 1976-04-14 | $7700.00 | Window Closed / Lapsed |