Patent US2728271A successfully refreshed from Google Patents.
US2728271A
Expired / Lapsed
US
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Paper machinery
Assignee: Black Clawson Co
•
Filing: 1952-02-16
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Granted: 1955-12-27
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Expires: 1972-02-16
Abstract
No abstract record available.
Inventors
- 👤 Otis R Witworth
- 👤 Derald R Hatton
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 17:33
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/02; D21F1/028
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US952808A
Cited
GB356294A
Cited
US1841693A
Cited
US2344282A
Cited
US2347850A
Cited
US2347717A
Cited
US2381286A
Cited
US2566450A
Cited
US2619011A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1958-12-26 | 1959-06-27 | 1959-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1962-12-26 | 1963-06-27 | 1963-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1966-12-26 | 1967-06-27 | 1967-12-27 | $7700.00 | Window Closed / Lapsed |