Patent US3600138A successfully refreshed from Google Patents.
US3600138A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Crystallizer
Assignee: Struthers Scientific and International Corp
•
Filing: 1967-08-11
•
Granted: 1971-08-17
•
Expires: 1987-08-11
Abstract
Abstract A VACUUM EVAPORATOR WITHIN A SINGLE SHELL HAVING A DOWNWARDLY EXTENDING CONE WITHIN THE SHELL AND HAVING A TAIL PIPE EXTENDING DOWNWARD FROM THE CONE, AND MEANS WITHIN THE TAIL PIPE CIRCULATING A MOTHER LIQUOR DOWNWARD IN SAID TAIL PIPE TO FLOW UPWARD ABOUT THE CONE, THE UPPER CHAMBER BEING A VACUUM EVAPORATING CHAMBER AND THE LOWER CHAMBER BEING A CRYSTALLIZATION CHAMBER.
Inventors
- 👤 Robert R Voigt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 19:57
CPC Classifications
B; B01; B01D; B01D9/00; B01D9/0018; B01D9/0022; B01D9/0036
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-08-16 | 1975-02-15 | 1975-08-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-08-16 | 1979-02-15 | 1979-08-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-08-16 | 1983-02-15 | 1983-08-17 | $7700.00 | Window Closed / Lapsed |