US2875666A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of simultaneously counting red and white blood cells
Assignee: Commonwealth Engineering Company of Ohio
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Filing: 1953-07-13
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Granted: 1959-03-03
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Expires: 1973-07-13
Abstract
No abstract record available.
Inventors
- 👤 James C Parker
- 👤 William R Horst
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 22:29
CPC Classifications
G; G06; G06M; G06M1/00; G06M1/08; G06M1/10; G06M1/101
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
111 words
IN A METHOD OF SIMULTANEOUSLY COUNTING RED AND WHITE BLOOD CELLS, THE STEPS OF STAINING THE RED AND WHITE CELLS TWO DIFFERENT COLORS, ONE FOR THE RED AND ANOTHER FOR THE WHITE CELLS: FORMING A SUSPENSION OF THE STAINED CELLS HAVING THE DIFFERENT COLORS; PASSING THE SUSPENSION SLOWLY THROUGH A LIGHT SOURCE WHICH EMITS LIGHT OF THE SAME COLORS AS THOSE OF THE STAINED CELLS TO EXPOSE THE INDIVIDUAL CELLS TO THE LIGHT AND WHEREBY THE LIGHT TRANSMITTED IS REDUCED IN INTENSITY AS TO EACH COLOR BY CELLS OF THE OTHER COLOR; AND RECORDING A SEPARATE ELECTRICAL RESPONSE TO THE DECREASES IN INTENSITY OCCASIONED BY THE PASSAGE OF THE INDIVIDUAL CELLS.
Claim 2
Dependent Claim
111 words
IN A METHOD OF SIMULTANEOUSLY COUNTING RED AND WHITE BLOOD CELLS, THE STEPS OF STAINING THE RED AND WHITE CELLS TWO DIFFERENT COLORS, ONE FOR THE RED AND ANOTHER FOR THE WHITE CELLS: FORMING A SUSPENSION OF THE STAINED CELLS HAVING THE DIFFERENT COLORS; PASSING THE SUSPENSION SLOWLY THROUGH A LIGHT SOURCE WHICH EMITS LIGHT OF THE SAME COLORS AS THOSE OF THE STAINED CELLS TO EXPOSE THE INDIVIDUAL CELLS TO THE LIGHT AND WHEREBY THE LIGHT TRANSMITTED IS REDUCED IN INTENSITY AS TO EACH COLOR BY CELLS OF THE OTHER COLOR; AND RECORDING A SEPARATE ELECTRICAL RESPONSE TO THE DECREASES IN INTENSITY OCCASIONED BY THE PASSAGE OF THE INDIVIDUAL CELLS.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1962-03-02 | 1962-09-01 | 1963-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-03-02 | 1966-09-01 | 1967-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-03-02 | 1970-09-01 | 1971-03-03 | $7700.00 | Window Closed / Lapsed |