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 02:21
CPC Classifications
D; D21; D21D; D21D1/00; D21D1/20; D21D1/32
Claims Analysis
Total Claims: 0
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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 |