US3674438A
Expired / Lapsed
US
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Ouchterlony technique apparatus
Assignee: JAMES T SHEN
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Filing: 1970-05-20
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Granted: 1972-07-04
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Expires: 1990-05-20
Abstract
Abstract OUCHTERLONY TECHNIQUE APPARATUS COMPRISES A GENERALLY TRIANGULAR TRAY, AND A LAYER OF DIFFUSING MATERIAL IN THE TRAY FORMING AT LEAST THREE GROUPS OF WELLS ARRANGED IN A TRIANGULAR PATTERN GENERALLY CONFORMING WITH THE TRAY TRIANGULAR SHAPE. D R A W I N G
Inventors
- 👤 James T Shen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:03
CPC Classifications
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
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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) | 1975-07-04 | 1976-01-03 | 1976-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-07-04 | 1980-01-03 | 1980-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-07-04 | 1984-01-03 | 1984-07-04 | $7700.00 | Window Closed / Lapsed |