US2290961A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Desulphurizing apparatus
Assignee: Essex Research Corp
•
Filing: 1939-11-15
•
Granted: 1942-07-28
•
Expires: 1959-11-15
Abstract
No abstract record available.
Inventors
- 👤 Russell P Heuer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 03:44
CPC Classifications
C; C21; C21C; C21C1/00; C21C1/06
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) | 1945-07-27 | 1946-01-26 | 1946-07-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1949-07-27 | 1950-01-26 | 1950-07-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1953-07-27 | 1954-01-26 | 1954-07-28 | $7700.00 | Window Closed / Lapsed |