Patent US2167839A successfully refreshed from Google Patents.
US2167839A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Separator
Assignee: Fluor Corp
•
Filing: 1938-03-05
•
Granted: 1939-08-01
•
Expires: 1958-03-05
Abstract
No abstract record available.
Inventors
- 👤 Henderson Elting
- 👤 John B Reddick
- 👤 Bernard M Laulhere
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:36
CPC Classifications
B; B01; B01D; B01D45/00; B01D45/02; Y; Y10; Y10S; Y10S55/00; Y10S55/27
Claims Analysis
Total Claims: 0
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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) | 1942-07-31 | 1943-01-30 | 1943-08-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1946-07-31 | 1947-01-30 | 1947-08-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1950-07-31 | 1951-01-30 | 1951-08-01 | $7700.00 | Window Closed / Lapsed |