Patent US1804040A successfully refreshed from Google Patents.
Patent US3053069A successfully refreshed from Google Patents.
US3053069A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Towers for bleaching pulp material, especially cellulose pulp
Assignee: Valmet AB
•
Filing: 1959-12-29
•
Granted: 1962-09-11
•
Expires: 1979-12-29
Abstract
No abstract record available.
Inventors
- 👤 Leffler Nils Gustav
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 12:27
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/10
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
BE529983A
Cited
US2383684A
Cited
US2774654A
Cited
US2764011A
Cited
US2873600A
Cited
US2990710A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-09-10 | 1966-03-12 | 1966-09-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-09-10 | 1970-03-12 | 1970-09-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-09-10 | 1974-03-12 | 1974-09-11 | $7700.00 | Window Closed / Lapsed |