Patent US3522172A successfully refreshed from Google Patents.
US3522172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chromatographic processes and apparatus
Assignee: Individual
•
Filing: 1967-08-10
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Granted: 1970-07-28
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Expires: 1987-08-10
Abstract
No abstract record available.
Inventors
- 👤 Victor Pretorius
- 👤 Hans Helmut Hahn
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 12:58
CPC Classifications
G; G01; G01N; G01N30/00; G01N30/02; G01N30/26; G01N30/38; G01N30/60; G01N30/6052; G01N30/6069; G01N30/28; G01N30/32; G01N2030/324; G01N2030/387; G01N30/50; G01N30/52; G01N2030/521
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
CA703044A
Cited
US2893955A
Cited
US3005514A
Cited
US3283483A
Cited
US3250059A
Cited
US3298527A
Cited
US3374606A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-07-27 | 1974-01-26 | 1974-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-07-27 | 1978-01-26 | 1978-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-07-27 | 1982-01-26 | 1982-07-28 | $7700.00 | Window Closed / Lapsed |