US4162850A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Field test for Schistosoma eggs
Assignee: Case Western Reserve University
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Filing: 1976-03-01
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Granted: 1979-07-31
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Expires: 1996-03-01
Abstract
Abstract Eggs of Schistosoma species in urine are reliably counted in a simple field test involving passing a urine sample of 10 ml or less through a thin transparent microporous membrane having pores of less than about 30 μm, drying the membrane until ready for counting, wetting the membrane with a drop of saline solution, scanning the membrane at about 40X magnification and counting the eggs. Workers of limited skill can run a test in about 1 minute.
Inventors
- 👤 Kenneth S. Warren
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 16:57
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
92 words
A process for rapidly ascertaining the presence of Schistosoma eggs in a patient comprising taking a urine sample from the patient, passing about 5 to 10ml of the urine sample through a substantially transparent microporous membrane having a diameter of about 10 to 20mm and pores of a maximum diameter of the order of about 10 μm, drying the membrane, wetting the membrane with saline solution, viewing substantially the entire membrane under a microscope at a magnification varying from about 25 to 50X, and counting any Schistosoma eggs viewed under the microscope.
Claim 2
Dependent Claim
92 words
A process for rapidly ascertaining the presence of Schistosoma eggs in a patient comprising taking a urine sample from the patient, passing about 5 to 10ml of the urine sample through a substantially transparent microporous membrane having a diameter of about 10 to 20mm and pores of a maximum diameter of the order of about 10 μm, drying the membrane, wetting the membrane with saline solution, viewing substantially the entire membrane under a microscope at a magnification varying from about 25 to 50X, and counting any Schistosoma eggs viewed under the microscope.
Claim 3
Dependent Claim
48 words
The process according to claim 1, wherein the urine sample is about 5 ml, and the membrane comprises polycarbonate of a thickness of the order of about 10 μm, has a diameter of about 13 mm and is viewed under the microscope at a magnitude of about 40X.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1982-07-30 | 1983-01-29 | 1983-07-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1986-07-30 | 1987-01-29 | 1987-07-31 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1990-07-30 | 1991-01-29 | 1991-07-31 | $7700.00 | Window Closed / Lapsed |