US3717425A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for production of thermoplastic sheet
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1971-04-16
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Granted: 1973-02-20
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Expires: 1991-04-16
Abstract
Abstract Plastic polyolefin sheets may be formed by passing extruded resin through a primary cooling zone having a moving, smooth free surface on the cooling liquid, cooling being effected by laminar flow cooling liquid and thence by turbulent flow cooling liquid.
Inventors
- 👤 E Kaplan
- 👤 H North
- 👤 H Sherman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 02:39
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/88; B29C48/911; B29C48/9135; B29C48/914; B29C48/03; B29C48/07; B29C48/08
Claims Analysis
Total Claims: 0
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References Cited (Backward Citations)
US3622657A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-02-20 | 1976-08-21 | 1977-02-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-02-20 | 1980-08-21 | 1981-02-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-02-20 | 1984-08-21 | 1985-02-20 | $7700.00 | Window Closed / Lapsed |