Patent US2780281A successfully refreshed from Google Patents.
US2780281A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Treatment of sulphite liquor
Assignee: HERBERT H CLARK
•
Filing: 1952-01-09
•
Granted: 1957-02-05
•
Expires: 1972-01-09
Abstract
No abstract record available.
Inventors
- 👤 Armin E Reinert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:13
CPC Classifications
D; D21; D21C; D21C11/00; D21C11/0042; Y; Y10; Y10S; Y10S159/00; Y10S159/05
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US981860A
Cited
US1273208A
Cited
GB243982A
Cited
US2009283A
Cited
US1976204A
Cited
US2312474A
Cited
US2411152A
Cited
US2471035A
Cited
US2542041A
Cited
US2533125A
Cited
US2556250A
Cited
US2595852A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1960-02-05 | 1960-08-06 | 1961-02-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1964-02-05 | 1964-08-06 | 1965-02-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1968-02-05 | 1968-08-06 | 1969-02-05 | $7700.00 | Window Closed / Lapsed |