US3554704A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Biological assay cell
Assignee: Cordis Corp
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Filing: 1969-02-10
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Granted: 1971-01-12
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Expires: 1989-02-10
Abstract
Abstract A READY TO USE TWO DIRECTIONAL IMMUNODIFFUSION (OUCHTERLONY) CELL CONSISTS OF A TRANSPARENT PLASTIC CONTAINER IN WHICH IS HOUSED A PREFORMED GEL LAYER AND AN ADJACENT SURFACE CONTACTING TEMPLATE FORMED WITH WELLS TO RECEIVE LIQUID REACTANTS. THE VOLUME OCCUPIED BY THE GEL LAYER IS SEALED BY A MEMBRANE FROM MOST OF THE REMAINING AIR SPACE WITHIN THE CELL, AND A TROUGH FOR WATER TO MAIN- TAIN A SATURATED ATMOSPHERE IS FORMED WITHIN SUCH REMAINING AIR SPACE.
Inventors
- 👤 Alexis E Ushakoff
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:20
CPC Classifications
G; G01; G01N; G01N33/00; G01N33/48; G01N33/50; G01N33/53; G01N33/558; Y; Y10; Y10S; 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) | 1974-01-11 | 1974-07-13 | 1975-01-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-01-11 | 1978-07-13 | 1979-01-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-01-11 | 1982-07-13 | 1983-01-12 | $7700.00 | Window Closed / Lapsed |