Patent US2494431A successfully refreshed from Google Patents.
US2494431A
Expired / Lapsed
US
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Continuous corrugating mechanism
Assignee: Individual
•
Filing: 1945-06-28
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Granted: 1950-01-10
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Expires: 1965-06-28
Abstract
No abstract record available.
Inventors
- 👤 Karl J Eckstein
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:38
CPC Classifications
B; B31; B31F; B31F1/00; B31F1/20; B31F1/22
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US654884A
Cited
US775541A
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US775495A
Cited
GB376846A
Cited
US2236932A
Cited
US2285617A
Cited
GB541015A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1953-01-09 | 1953-07-11 | 1954-01-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1957-01-09 | 1957-07-11 | 1958-01-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1961-01-09 | 1961-07-11 | 1962-01-10 | $7700.00 | Window Closed / Lapsed |