US2910349A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method for titrating calcium
Assignee: Individual
•
Filing: 1956-11-02
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Granted: 1959-10-27
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Expires: 1976-11-02
Abstract
No abstract record available.
Inventors
- 👤 Reeder Wendell
- 👤 James C Patton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 22:44
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/22
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
115 words
A METHOD OF DETERMINING CALCIUM IN SOLUTION IN THE PRESENCE OF MAGNESIUM WHICH COMPRISES TITRATING A MEASURED AMOUNT OF THE SOLUTION WITH A SOLUTION OF STANDARD (ETHYLENEDINITRILLO) TETRAACETATE IN THE PRESENCE OF A KNOWN CONCENTRATION OF AN INDICATOR OF THE GENERAL FORMULA R1-N=N-R2 WHERE R1 IS A NAPHTHALENE HYDROCARBON RADICAL HAVING ONE HYDROGEN ATOM SUBSTITUATED BY A CARBOXY RADICAL AND ONE HYDROGEN ATOM IN THE 2 POSITION SUBSTITUATED BY A HYDROXYL RADICAL, AND R2 IS A NAPHTHALENE HYDROCARBON RADICAL HAVING ONE HYDROGEN ATOM IN THE 2 POSITION SUBSTITUTED BY A HYDROXYL RADICAL AND ONE HYDROGEN ATOM IN THE 3 POSITION SUBSTITUTED BY A RADICAL SELECTED FROM THE GROUP CONSISTING OF THE CARBOXYL AND SULFONE RADICALS.
Claim 2
Independent Claim
115 words
A METHOD OF DETERMINING CALCIUM IN SOLUTION IN THE PRESENCE OF MAGNESIUM WHICH COMPRISES TITRATING A MEASURED AMOUNT OF THE SOLUTION WITH A SOLUTION OF STANDARD (ETHYLENEDINITRILLO) TETRAACETATE IN THE PRESENCE OF A KNOWN CONCENTRATION OF AN INDICATOR OF THE GENERAL FORMULA R1-N=N-R2 WHERE R1 IS A NAPHTHALENE HYDROCARBON RADICAL HAVING ONE HYDROGEN ATOM SUBSTITUATED BY A CARBOXY RADICAL AND ONE HYDROGEN ATOM IN THE 2 POSITION SUBSTITUATED BY A HYDROXYL RADICAL, AND R2 IS A NAPHTHALENE HYDROCARBON RADICAL HAVING ONE HYDROGEN ATOM IN THE 2 POSITION SUBSTITUTED BY A HYDROXYL RADICAL AND ONE HYDROGEN ATOM IN THE 3 POSITION SUBSTITUTED BY A RADICAL SELECTED FROM THE GROUP CONSISTING OF THE CARBOXYL AND SULFONE RADICALS.
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) | 1962-10-26 | 1963-04-27 | 1963-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-10-26 | 1967-04-27 | 1967-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-10-26 | 1971-04-27 | 1971-10-27 | $7700.00 | Window Closed / Lapsed |