Patent US3575768A successfully refreshed from Google Patents.
US3575768A
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Machine for making corrugated fibre
Assignee: ThyssenKrupp Budd Co
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Filing: 1968-04-01
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Granted: 1971-04-20
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Expires: 1988-04-01
Abstract
Abstract AN ARTICLE OF MANUFACTURE COMPRISES A STRIP OF CORRUGATED FIBRE WITH THE CORRUGATIONS BEING SUBSTANTIALLY SQUARE AND BEING FORMED AGAINIST THE GRAINS WHICH RUN LENGTHWISE IN THE FIBRE. MEANS AND METHODS FOR MAKING SUCH CORRUGATED FIBRE ARE ALSO PROVIDED.
Inventors
- 👤 Joseph R Hannum
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 07:28
CPC Classifications
B; B31; B31F; B31F1/00; B31F1/20; B31F1/24; B31F1/247; Y; Y10; Y10T; Y10T156/00; Y10T156/10; Y10T156/1002; Y10T156/1007; Y10T156/1016
Claims Analysis
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References Cited (Backward Citations)
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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) | 1974-04-19 | 1974-10-19 | 1975-04-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-04-19 | 1978-10-19 | 1979-04-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-04-19 | 1982-10-19 | 1983-04-20 | $7700.00 | Window Closed / Lapsed |