Patent US2022546A successfully refreshed from Google Patents.
Patent US2688276A successfully refreshed from Google Patents.
US2688276A
Expired / Lapsed
US
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Head box for paper machines
Assignee: Marathon Corp
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Filing: 1951-05-11
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Granted: 1954-09-07
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Expires: 1971-05-11
Abstract
No abstract record available.
Inventors
- 👤 Robert E Showers
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 10:45
CPC Classifications
D; D21; D21F; D21F1/00; D21F1/02; D21F1/028; D21F1/026
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US417546A
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US1152747A
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US1552629A
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US1610742A
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US1667755A
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US1890634A
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US2284098A
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US2202890A
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US2347130A
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US2394509A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1957-09-06 | 1958-03-08 | 1958-09-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-09-06 | 1962-03-08 | 1962-09-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-09-06 | 1966-03-08 | 1966-09-07 | $7700.00 | Window Closed / Lapsed |