Patent US3057057A successfully refreshed from Google Patents.
US3057057A
Expired / Lapsed
US
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Method of making a honeycomb sandwich structure
Assignee: Engelhard Industries Inc
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Filing: 1958-10-01
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Granted: 1962-10-09
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Expires: 1978-10-01
Abstract
No abstract record available.
Inventors
- 👤 Otto W Langhans
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 13:41
CPC Classifications
B; B21; B21D; B21D47/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
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US2609068A
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US2699599A
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US2746139A
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US2756496A
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GB750610A
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US2816355A
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US2900713A
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US2796157A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1965-10-08 | 1966-04-09 | 1966-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1969-10-08 | 1970-04-09 | 1970-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1973-10-08 | 1974-04-09 | 1974-10-09 | $7700.00 | Window Closed / Lapsed |