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US3030798A
Expired / Lapsed
US
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Chromatographic process and apparatus
Assignee: Gulf Research and Development Co
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Filing: 1956-11-02
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Granted: 1962-04-24
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Expires: 1976-11-02
Abstract
No abstract record available.
Inventors
- 👤 Dean H Lichtenfels
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:33
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/26; G01N30/38; G01N30/46; G01N30/468; G01N30/40; G01N30/461; G01N30/466
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2398818A
Cited
US2868011A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-04-23 | 1965-10-23 | 1966-04-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-04-23 | 1969-10-23 | 1970-04-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-04-23 | 1973-10-23 | 1974-04-24 | $7700.00 | Window Closed / Lapsed |