US2461389A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Laboratory circulating evaporator
Assignee: Individual
•
Filing: 1945-02-23
•
Granted: 1949-02-08
•
Expires: 1965-02-23
Abstract
No abstract record available.
Inventors
- 👤 David T Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 19:06
CPC Classifications
B; B01; B01L; B01L7/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US686530A
Cited
US1024641A
Cited
US984265A
Cited
US1609614A
Cited
US1568413A
Cited
US1735979A
Cited
US2100095A
Cited
US2288245A
Cited
US2391244A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-02-08 | 1952-08-09 | 1953-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-02-08 | 1956-08-09 | 1957-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-02-08 | 1960-08-09 | 1961-02-08 | $7700.00 | Window Closed / Lapsed |