US2492047A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Bleaching wood pulp
Assignee: EIDP Inc
•
Filing: 1946-03-30
•
Granted: 1949-12-20
•
Expires: 1966-03-30
Abstract
No abstract record available.
Inventors
- 👤 Burg Paul B K
- 👤 Joseph S Reichert
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 05:19
CPC Classifications
D; D21; D21C; D21C9/00; D21C9/10; D21C9/1026
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US872097A
Cited
US1106371A
Cited
US1409799A
Cited
US1529919A
Cited
US1795757A
Cited
US1907548A
Cited
US1968994A
Cited
US2194358A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-12-19 | 1953-06-20 | 1953-12-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-12-19 | 1957-06-20 | 1957-12-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-12-19 | 1961-06-20 | 1961-12-20 | $7700.00 | Window Closed / Lapsed |