Patent US2870690A successfully refreshed from Google Patents.
US2870690A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Head box for paper making machines
Assignee: Black Clawson Co
•
Filing: 1952-11-06
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Granted: 1959-01-27
•
Expires: 1972-11-06
Abstract
No abstract record available.
Inventors
- 👤 Wesley S Corbin
- 👤 Charles M Pearson
- 👤 Walden Henrik
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 21:03
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/02; D21F1/028
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) | 1962-01-26 | 1962-07-28 | 1963-01-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1966-01-26 | 1966-07-28 | 1967-01-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1970-01-26 | 1970-07-28 | 1971-01-27 | $7700.00 | Window Closed / Lapsed |