US2824842A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Urine calcium test
Assignee: Individual
•
Filing: 1954-06-09
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Granted: 1958-02-25
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Expires: 1974-06-09
Abstract
No abstract record available.
Inventors
- 👤 Sulkowitch Hirsh
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 02:48
CPC Classifications
G; G01; G01N; G01N31/00; G01N31/02; G01N33/00; G01N33/48; G01N33/50; G01N33/84
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
146 words
A REAGENT IN DRY SOILD FORM FOR SEMIQUANTITATIVELY ESTIMATING THE CALCIUM CONTENT OF BODY FLUIDS COMPRISING OXALIC ACID AND AMMONIUM OXALATE IN THE PROPORTION OF ABOUT 25-40 PARTS BY WEIGHT OF OXALIC ACID TO 25 PARTS AMMONIUM OXALATE, A BUFFER ADAPTED TO MAINTAIN A PH IN THE RANGE BETWEEN 2.8 AND 5.5 WHEN THE REAGENT IS ADDED TO THE FLUID TO BE TESTED, SAID BUFFER BEING THE COMBINATION OF: (A)M A MENOALKALI METAL SALT OF AN ACID SELECTED FROM THE GROUP CONSISTING OF PHOSPHORIC ACID, MALEIC ACID, MALONIA ACID AND SUCCLNIC ACID; AND (B), A MONOALKALI METAL SALT OF AN ACID SELECTED FROM THE GROUP CONSISTING OF PHTHALIC ACID, GLUTARIC ACID, ITAACONIC ACID, MALIC ACID, PIMELIC ACID AND PYROTARTARIC ACID, AND A PH INDICATOR ADAPTED TO PRODUCE A PREDETERMINED COLOR WHEN THE PH OF THE FLUID TO BE TESTED, AFTYER ADDITION OF REAGENT, EXCEEDS PH 5.5.
Claim 2
Dependent Claim
146 words
A REAGENT IN DRY SOILD FORM FOR SEMIQUANTITATIVELY ESTIMATING THE CALCIUM CONTENT OF BODY FLUIDS COMPRISING OXALIC ACID AND AMMONIUM OXALATE IN THE PROPORTION OF ABOUT 25-40 PARTS BY WEIGHT OF OXALIC ACID TO 25 PARTS AMMONIUM OXALATE, A BUFFER ADAPTED TO MAINTAIN A PH IN THE RANGE BETWEEN 2.8 AND 5.5 WHEN THE REAGENT IS ADDED TO THE FLUID TO BE TESTED, SAID BUFFER BEING THE COMBINATION OF: (A)M A MENOALKALI METAL SALT OF AN ACID SELECTED FROM THE GROUP CONSISTING OF PHOSPHORIC ACID, MALEIC ACID, MALONIA ACID AND SUCCLNIC ACID; AND (B), A MONOALKALI METAL SALT OF AN ACID SELECTED FROM THE GROUP CONSISTING OF PHTHALIC ACID, GLUTARIC ACID, ITAACONIC ACID, MALIC ACID, PIMELIC ACID AND PYROTARTARIC ACID, AND A PH INDICATOR ADAPTED TO PRODUCE A PREDETERMINED COLOR WHEN THE PH OF THE FLUID TO BE TESTED, AFTYER ADDITION OF REAGENT, EXCEEDS PH 5.5.
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) | 1961-02-24 | 1961-08-26 | 1962-02-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-24 | 1965-08-26 | 1966-02-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-24 | 1969-08-26 | 1970-02-25 | $7700.00 | Window Closed / Lapsed |