US3830900A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method of forming foamed plastic sheets
Assignee: Solo Cup Operating Corp
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Filing: 1971-12-07
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Granted: 1974-08-20
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Expires: 1991-12-07
Abstract
Abstract A method forming foamed plastic sheets wherein an expandable thermoplastic strip is first extruded through an orifice defining a radiating path and then spread laterally over an arcuate yoke adjacent the orifice to prevent the formation of wrinkles in the sheets.
Inventors
- 👤 T Winstead
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 13:22
CPC Classifications
B; B29; B29C; B29C44/00; B29C44/34; B29C44/36; B29C44/46; B29C44/50; B29C44/505; B29L; B29L2007/00; Y; Y10; Y10S; Y10S264/00; Y10S264/13; Y10S264/16
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) | 1977-08-19 | 1978-02-18 | 1978-08-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-08-19 | 1982-02-18 | 1982-08-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-08-19 | 1986-02-18 | 1986-08-20 | $7700.00 | Window Closed / Lapsed |