US2543870A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Suction box cover for papermaking machines
Assignee: Individual
•
Filing: 1947-12-10
•
Granted: 1951-03-06
•
Expires: 1967-12-10
Abstract
No abstract record available.
Inventors
- 👤 Douglas R Robbins
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:12
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/48; D21F1/52; D21F1/523
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US751095A
Cited
US708219A
Cited
US920100A
Cited
US1236359A
Cited
US1832844A
Cited
AT141045B
Cited
US2010150A
Cited
US2042198A
Cited
US2346785A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1954-03-05 | 1954-09-04 | 1955-03-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1958-03-05 | 1958-09-04 | 1959-03-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1962-03-05 | 1962-09-04 | 1963-03-06 | $7700.00 | Window Closed / Lapsed |