US2489079A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for forming fibrous sheets or paperboard
Assignee: Lawrence University
•
Filing: 1946-04-18
•
Granted: 1949-11-22
•
Expires: 1966-04-18
Abstract
No abstract record available.
Inventors
- 👤 James D A Clark
- 👤 Sidney D Wells
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 19:12
CPC Classifications
D; D04; D04H; D04H1/00; D04H1/70; D04H1/04; D04H1/08
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1952-11-21 | 1953-05-23 | 1953-11-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1956-11-21 | 1957-05-23 | 1957-11-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1960-11-21 | 1961-05-23 | 1961-11-22 | $7700.00 | Window Closed / Lapsed |