Patent US2454532A successfully refreshed from Google Patents.
US2454532A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Process for defibering lignocellulose while subjected to steam and a digestive chemical
Assignee: Wood Conversion Co
•
Filing: 1940-08-03
•
Granted: 1948-11-23
•
Expires: 1960-08-03
Abstract
No abstract record available.
Inventors
- 👤 Henry E Walter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 12:48
CPC Classifications
D; D21; D21B; D21B1/00; D21B1/04; D21B1/12; D21B1/14; D21B1/16
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
DE35854C
Cited
US106710A
Cited
US296780A
Cited
US417282A
Cited
US1153883A
Cited
US1016178A
Cited
US1539633A
Cited
US1872996A
Cited
US1654624A
Cited
US1785544A
Cited
US1794174A
Cited
US1913607A
Cited
US2008892A
Cited
GB393159A
Cited
US2047170A
Cited
US1982130A
Cited
AU1214933A
Cited
US2145851A
Cited
US2080078A
Cited
US2072686A
Cited
US2164040A
Cited
US2228349A
Cited
US2265622A
Cited
US2234188A
Cited
US2315372A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-11-23 | 1952-05-24 | 1952-11-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-11-23 | 1956-05-24 | 1956-11-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-11-23 | 1960-05-24 | 1960-11-23 | $7700.00 | Window Closed / Lapsed |