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US3033986A
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Chromatographic method and apparatus
Assignee: IOWA STATE COLLEGE RES FOUND
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Filing: 1958-05-23
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Granted: 1962-05-08
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Expires: 1978-05-23
Abstract
No abstract record available.
Inventors
- 👤 Eric B Fowler
- 👤 Wayne A Rhinehart
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 09:48
CPC Classifications
G; G21; G21H; G21H5/00; G21H5/02; G01; G01N; G01N30/00; G01N30/90; G01N30/95
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-05-07 | 1965-11-06 | 1966-05-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-05-07 | 1969-11-06 | 1970-05-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-05-07 | 1973-11-06 | 1974-05-08 | $7700.00 | Window Closed / Lapsed |