US3833694A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Molding polyurethane foam in a mold having a cyclically flexing cover
Assignee: Bethlehem Steel Corp
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Filing: 1972-07-05
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Granted: 1974-09-03
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Expires: 1992-07-05
Abstract
Abstract A POLYURETHANE FOAM CORE WALL PANEL IS PRODUCED BY PLACING A QUANTITY OF FOAM IN A MOLD COMPRISING A BOTTOM PANEL, A BORDER AND A TOP PANEL, AND, WHILE THE EXPANDING FOAM IS IN CONTACT WITH THE TOP PANEL CYCLICALLY FLEXING THE TOP PANEL UNTIL THE FOAM HAS COMPLETELY FILLED THE MOLD.
Inventors
- 👤 C Hughes
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 14:56
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/38; B29C44/42; B29C44/428; B29C33/00; B29C33/0038; B29C33/10; B29K; B29K2075/00
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) | 1977-09-02 | 1978-03-04 | 1978-09-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-09-02 | 1982-03-04 | 1982-09-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-09-02 | 1986-03-04 | 1986-09-03 | $7700.00 | Window Closed / Lapsed |