Patent US4736671A successfully refreshed from Google Patents.
Patent US3374152A successfully refreshed from Google Patents.
US3374152A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for the automatic control of the quality of the separation in a distillation process by maintaining a constant ratio of vapor flow to reflux flow
Assignee: Shell USA Inc
•
Filing: 1965-01-18
•
Granted: 1968-03-19
•
Expires: 1985-01-18
Abstract
No abstract record available.
Inventors
- 👤 Johannes E Rijnsdorp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 19:23
CPC Classifications
B; B01; B01D; B01D3/00; B01D3/42; B01D3/4211; B01D3/4216; Y; Y10; Y10S; Y10S203/00; Y10S203/19
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1971-03-19 | 1971-09-18 | 1972-03-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1975-03-19 | 1975-09-18 | 1976-03-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1979-03-19 | 1979-09-18 | 1980-03-19 | $7700.00 | Window Closed / Lapsed |