US2689715A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Blast furnace gas washer
Assignee: Individual
•
Filing: 1951-11-23
•
Granted: 1954-09-21
•
Expires: 1971-11-23
Abstract
No abstract record available.
Inventors
- 👤 Ericson Paul
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 06:02
CPC Classifications
B; B01; B01D; B01D47/00; B01D47/02; B01D47/025; B01D47/06
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
GB190505773A
Cited
GB191424598A
Cited
US1661265A
Cited
US1878582A
Cited
US1985010A
Cited
US2214932A
Cited
US2349777A
Cited
US2388344A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-20 | 1958-03-22 | 1958-09-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-20 | 1962-03-22 | 1962-09-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-20 | 1966-03-22 | 1966-09-21 | $7700.00 | Window Closed / Lapsed |