Patent US3692491A successfully refreshed from Google Patents.
US3692491A
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US
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Complement fixation testing tray
Assignee: American Hospital Supply Corp
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Filing: 1971-06-30
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Granted: 1972-09-19
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Expires: 1991-06-30
Abstract
Abstract AN AGAR-CONTAINING TRAY FOR USE IN A COMPLEMENT FIXATION TESTING PROCEDURE FOR VISUALLY DETERMINING WHETHER A SAMPLE OF BODY FLUID CONTAINS A GIVEN ANTIGEN OR ANTIBODY. SENSITIZED ANIMAL (SHEEP) RED CELLS (HEMOLYSINSHEEP RED BLOOD CELL COMPLEX) ARE EMBEDDED IN THE AGAR MEDIUM. WELLS ARE PROVIDED IN THE AGAR LAYER, EACH OF THE WELLS HAVING A PLURALITY OF SLITS RADIATING THEREFROM. WHEN THE TEST RESULTS ARE NEGATIVE, INDICATING THE ABSENCE OF THE GIVEN ANTIBODY OR ANTIGEN IN THE FLUID INTRODUCED INTO A WELL, HEMOLYSIS OCCURS ALONG THE MARGINS OF THE SLITS AND ABOUT THE BORDER OF THE WELL TO PRODUCE A READILY OBSERVABLE SUNBURST DESIGN.
Inventors
- 👤 Elmer F Trentelman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 17:50
CPC Classifications
C; C12; C12M; C12M25/00; C12M25/14; C12M23/00; C12M23/02; C12M23/12; G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/53; G01N33/558; G01N33/559; Y; Y10; Y10S; Y10S435/00; Y10S435/975; Y10S436/00; Y10S436/807; Y10S436/809
Claims Analysis
Total Claims: 0
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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) | 1975-09-19 | 1976-03-20 | 1976-09-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-09-19 | 1980-03-20 | 1980-09-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-09-19 | 1984-03-20 | 1984-09-19 | $7700.00 | Window Closed / Lapsed |