Patent DE56103C successfully refreshed from Google Patents.
US3528126A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuous production apparatus for hard core foam plates having rigid cover layers particularly on a polyurethane base
Assignee: Hennecke GmbH
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Filing: 1968-07-26
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Granted: 1970-09-15
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Expires: 1988-07-26
Abstract
No abstract record available.
Inventors
- 👤 Rudolf Ernst
- 👤 Karl-Josef Kraft
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 10:19
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/20; B29C44/30; B29C44/308; B29C44/32; B29C44/326; B29L; B29L2007/00; B29L2009/00
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1973-09-14 | 1974-03-16 | 1974-09-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1977-09-14 | 1978-03-16 | 1978-09-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1981-09-14 | 1982-03-16 | 1982-09-15 | $7700.00 | Window Closed / Lapsed |