Patent EP0490171A2 successfully refreshed from Google Patents.
US2811891A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Flame spectrochemical analysis of body fluids and compositions for use therewith
Assignee: Individual
•
Filing: 1954-05-25
•
Granted: 1957-11-05
•
Expires: 1974-05-25
Abstract
No abstract record available.
Inventors
- 👤 Jr Thomas C Roddy
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 09:33
CPC Classifications
G; G01; G01N; G01N21/00; G01N21/62; G01N21/71; G01N21/72
Claims Analysis
Total Claims: 1
Claim 1
Independent Claim
96 words
IN A PROCESS FOR THE SPECTROCHEMICAL DETERMINATION OF THE CALCIUM, POTASSIUM AND SODIUM CONCENTTRATION IN BODY FLUIDS, THE STEPS OF ADDING A DEPROTEINIZING AGENT TO A SAMPLE OF BODY FLUID, SEPARATING CLEAR SUPERNATANT LIQUID FROM THE RESULTING FLUID MIXTURE, ASPIRATING THE CLEAN LIQUID STREAMWISE IN A FLAME, OBTAINING A SPECTROPHOTOMETRIC READING FOR THE INTENSITY OF A MAJOR POTASSIUM EMISSION LINE AND A MAJOR CALCIUM EMISSION LINE OF THE RESULTING IGNITION FLAME AND SIMILARLY OBTAINING THE COMPARABLE SPECTROPHOTOMETRIC READING OF THE INTENSITY OF THE SAME EMISSION LINES IN THE IGNITION SPECTRA FOR EACH OF THE FOLLOWING SOLUTIONS:
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) | 1960-11-04 | 1961-05-06 | 1961-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-11-04 | 1965-05-06 | 1965-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-11-04 | 1969-05-06 | 1969-11-05 | $7700.00 | Window Closed / Lapsed |