US3586574A
Expired / Lapsed
US
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Apparatus for making a sandwich panel
Assignee: SEIKISUI SPONGE KOGYO KK
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Filing: 1968-06-13
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Granted: 1971-06-22
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Expires: 1988-06-13
Abstract
Abstract APPARATUS FOR CONTINUOUS FORMING OF SANDWICH-TYPE PANELS HAVING A POROUS THERMOPLASTIC RESIN LAYER INTERPOSED BETWEEN AND AFFIXED TO OUTER SHEETS OF FACING MATERIAL.
Inventors
- 👤 Shigenari Soda
- 👤 Tatsujiro Seki
- 👤 Hiroji Abu
- 👤 Susumu Ishiwatari
- 👤 Ken Yamamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:37
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/20; B29C44/30; B29C44/32; B29C44/326; B29C66/00; B29C66/80; B29C66/81; B29C66/818; B29C66/8187; B29C66/81871; B29D; B29D99/00; B29D99/001; B29D99/0021; B32; B32B; B32B27/00; B29C66/70; B29C66/71
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-06-21 | 1974-12-21 | 1975-06-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-21 | 1978-12-21 | 1979-06-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-21 | 1982-12-21 | 1983-06-22 | $7700.00 | Window Closed / Lapsed |