Patent US5221965A successfully refreshed from Google Patents.
Patent US3450596A successfully refreshed from Google Patents.
US3450596A
Expired / Lapsed
US
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Headbox for twin wire paper machine
Assignee: Black Clawson Co
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Filing: 1965-02-19
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Granted: 1969-06-17
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Expires: 1985-02-19
Abstract
No abstract record available.
Inventors
- 👤 Marshall S Green
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 14:38
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/02; D21F1/022; D21F1/028; Y; Y10; Y10S; Y10S162/00; Y10S162/07
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US2969114A
Cited
US3296066A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1972-06-16 | 1972-12-16 | 1973-06-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1976-06-16 | 1976-12-16 | 1977-06-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1980-06-16 | 1980-12-16 | 1981-06-17 | $7700.00 | Window Closed / Lapsed |