Patent US2418547A successfully refreshed from Google Patents.
US2418547A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for defibering paper stock
Assignee: COWLES CO
•
Filing: 1943-03-17
•
Granted: 1947-04-08
•
Expires: 1963-03-17
Abstract
No abstract record available.
Inventors
- 👤 Cowles Edwin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:57
CPC Classifications
D; D21; D21D; D21D1/00; D21D1/20; D21D1/32
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
US1334395A
Cited
US1406791A
Cited
US1744145A
Cited
US1825155A
Cited
US1951684A
Cited
US2024424A
Cited
US2057478A
Cited
US2111663A
Cited
US2267317A
Cited
US2233561A
Cited
US2219571A
Cited
US2265936A
Cited
US2351728A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1950-04-07 | 1950-10-07 | 1951-04-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1954-04-07 | 1954-10-07 | 1955-04-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1958-04-07 | 1958-10-07 | 1959-04-08 | $7700.00 | Window Closed / Lapsed |