UST912003I4
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extrusion of resins
Assignee: —
•
Filing: 1972-05-23
•
Granted: 1973-07-10
•
Expires: 1992-05-23
Abstract
Abstract A SHEET OF FOAMED THERMOPLASTIC SYNTHETIC RESIN IS MADE BY EXTRUDING A FOAMABLE THERMOPLASTIC SYNTHETIC RESIN THROUGH A SLIT DIE. THE DIE COMPRISES AN EXIT ZONE DEFINED BY A PAIR OF OPPOSING SURFACES. ONE OF THE SURFACES MOVES IN THE DIRECTION OF THE EXTRUSION AND IS CONVEX IN THAT DIRECTION. THE OTHER SURFACE IS PLANAR. FOAMING OF THE RESIN OCCURS AS IT MOVES THROUGH THE EXIT ZONE. THE RELATIVE SPACING OF THE SURFACES IS SUCH THAT THEY CONTACT THE EXPANDING AND FOAMING RESIN AND A FOAMED RESIN SHEET IS PRODUCED.
Inventors
No inventors recorded.
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 14:04
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/50; B29C44/505; B29L; B29L2007/00
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) | 1976-07-09 | 1977-01-08 | 1977-07-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-09 | 1981-01-08 | 1981-07-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-09 | 1985-01-08 | 1985-07-10 | $7700.00 | Window Closed / Lapsed |