US2442990A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for washing paper stock
Assignee: Lawrence University
•
Filing: 1942-06-24
•
Granted: 1948-06-08
•
Expires: 1962-06-24
Abstract
No abstract record available.
Inventors
- 👤 Sidney D Wells
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 08:29
CPC Classifications
D; D06; D06B; D06B5/00
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US718651A
Cited
US813984A
Cited
US983441A
Cited
US1245839A
Cited
US1468337A
Cited
US1405944A
Cited
US1396227A
Cited
US1700925A
Cited
US1632802A
Cited
US1707604A
Cited
US1746434A
Cited
US1828279A
Cited
US2018938A
Cited
US2005839A
Cited
US2078810A
Cited
US2077059A
Cited
US2060685A
Cited
US2116511A
Cited
US2098608A
Cited
US2193032A
Cited
US2331455A
Cited
US2249128A
Cited
US2355243A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1951-06-08 | 1951-12-08 | 1952-06-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1955-06-08 | 1955-12-08 | 1956-06-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1959-06-08 | 1959-12-08 | 1960-06-08 | $7700.00 | Window Closed / Lapsed |