Patent US2670663A successfully refreshed from Google Patents.
US2670663A
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US
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Process for making crush resistant boxboard
Assignee: WESTION PAPER AND Manufacturing CO
•
Filing: 1951-05-03
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Granted: 1954-03-02
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Expires: 1971-05-03
Abstract
No abstract record available.
Inventors
- 👤 Elwood P Wenzelberger
- 👤 Kurt A Wohl
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 07:11
CPC Classifications
D; D21; D21H; D21H17/00; D21H17/20; D21H17/33; D21H17/46; D21H17/47; D21H17/49; D21H17/50; D21H17/21; D21H17/24; D21H17/28
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) | 1957-03-01 | 1957-08-31 | 1958-03-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1961-03-01 | 1961-08-31 | 1962-03-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1965-03-01 | 1965-08-31 | 1966-03-02 | $7700.00 | Window Closed / Lapsed |