US3539494A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromatographic separation
Assignee: Individual
•
Filing: 1967-08-02
•
Granted: 1970-11-10
•
Expires: 1987-08-02
Abstract
No abstract record available.
Inventors
- 👤 Victor Pretorius
- 👤 Hans Helmut Hahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 15:43
CPC Classifications
B; B01; B01D; B01D15/00; B01D15/08; B01D15/26; B01D15/38; B01D15/3861; B01D15/3885; B01D11/00; B01D11/02; B01D11/04; B01D53/00; B01D53/14; B01D53/18; G; G01; G01N; G01N27/00; G01N27/26; G01N27/416; G01N27/447; G01N30/00; G01N30/02; G01N30/04; G01N30/06; G01N30/26; G01N30/28; G01N30/34; G01N30/38; G01N30/50; G01N30/56; G01N30/62; G01N30/64; G01N30/84; G01N2030/387; G01N2030/626; G01N2030/645; G01N30/14
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) | 1973-11-09 | 1974-05-11 | 1974-11-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-11-09 | 1978-05-11 | 1978-11-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-11-09 | 1982-05-11 | 1982-11-10 | $7700.00 | Window Closed / Lapsed |