US2440097A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Trough separator with vertical classifying current
Assignee: Individual
•
Filing: 1945-05-09
•
Granted: 1948-04-20
•
Expires: 1965-05-09
Abstract
No abstract record available.
Inventors
- 👤 Dorothy E Kear
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 05:27
CPC Classifications
B; B03; B03B; B03B5/00; B03B5/68
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US478971A
Cited
US519245A
Cited
US631411A
Cited
US771874A
Cited
US1170848A
Cited
CH93480A
Cited
US1580728A
Cited
US1752791A
Cited
US1696767A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-04-20 | 1951-10-20 | 1952-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-04-20 | 1955-10-20 | 1956-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-04-20 | 1959-10-20 | 1960-04-20 | $7700.00 | Window Closed / Lapsed |