US3087794A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chemical test for differentiating leucocytes from erythrocytes
Assignee: Bayer Corp
•
Filing: 1960-05-23
•
Granted: 1963-04-30
•
Expires: 1980-05-23
Abstract
No abstract record available.
Inventors
- 👤 Alfred H Free
- 👤 Helen M Free
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 14:21
CPC Classifications
C; C12; C12Q; C12Q1/00; C12Q1/26; C12Q1/28; Y; Y10; Y10S; Y10S435/00; Y10S435/805
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
102 words
A COMPOSITION FOR DETECTING ERTHROCYTES BY THEIR HEMIN CONTENT WHEN PRESENT IN A BODY FLUID ALSO CONTAINING LEUCOCYTES WITH THEIR PEROXIDASE CONTENT WHICH COMPOSITION COMPRISES A BIBULOUS STICK IMPREGNATED WITH HYDROGEN PEROXIDE AND AN ORGANIC INDICATOR COMPOUND WHICH FORMS A COLORED OXIDATION PRODUCT IN THE PRESENCE OF PEROXIDE AND PEROXIDASE AND IN THE PRESENCE OF PEROXIDE AND HEMIN, THE HYDROGEN PEROXIDE BEING 1.5% TO 5.0% CONCENTRATION WHEN SAID STICK IS WET BY SAID BODY FLUID, SAID CONCENTRATION OF HYDROGEN PEROXIDE BEING EFFECTIVE TO DECREASE THE INTENSITY OF COLOR DEVELOPEMENT DUE TO LEUCOCYTES WHILE INCREASING THE INTENSITY OF COLOR DEVELOPMENT DUE TO ERYTHROCYTES.
Claim 2
Dependent Claim
102 words
A COMPOSITION FOR DETECTING ERTHROCYTES BY THEIR HEMIN CONTENT WHEN PRESENT IN A BODY FLUID ALSO CONTAINING LEUCOCYTES WITH THEIR PEROXIDASE CONTENT WHICH COMPOSITION COMPRISES A BIBULOUS STICK IMPREGNATED WITH HYDROGEN PEROXIDE AND AN ORGANIC INDICATOR COMPOUND WHICH FORMS A COLORED OXIDATION PRODUCT IN THE PRESENCE OF PEROXIDE AND PEROXIDASE AND IN THE PRESENCE OF PEROXIDE AND HEMIN, THE HYDROGEN PEROXIDE BEING 1.5% TO 5.0% CONCENTRATION WHEN SAID STICK IS WET BY SAID BODY FLUID, SAID CONCENTRATION OF HYDROGEN PEROXIDE BEING EFFECTIVE TO DECREASE THE INTENSITY OF COLOR DEVELOPEMENT DUE TO LEUCOCYTES WHILE INCREASING THE INTENSITY OF COLOR DEVELOPMENT DUE TO ERYTHROCYTES.
References Cited (Backward Citations)
US2905594A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1966-04-29 | 1966-10-29 | 1967-04-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1970-04-29 | 1970-10-29 | 1971-04-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1974-04-29 | 1974-10-29 | 1975-04-30 | $7700.00 | Window Closed / Lapsed |