US3213172A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Chill-roll casting method for producing film from thermoplastic polymers
Assignee: Dow Chemical Co
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Filing: 1961-05-25
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Granted: 1965-10-19
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Expires: 1981-05-25
Abstract
No abstract record available.
Inventors
- 👤 Russell L Hoelzer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 18:00
CPC Classifications
B; B29; B29C; B29C41/00; B29C41/24
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
90 words
A METHOD OF FORMING A FLAT SHEET OF A NORMALLY SOLID FILM-FORMING POLYMERIC RESIN WHICH COMPRISES EXTRUDING A MOLTEN SHEET OF SAID POLYMERIC RESIN UPON A CONTINUOUSLY MOVING SATIN-FINISHED SURFACE CHARACTERIZED IN HAVING A ROUGHNESS BETWEEN ABOUT 10 AND 60 R.M.S. MAINAINED AT A TEMPERATURE BELOW THE FUSION TEMPERATURE OF SAID POLYMERIC RESIN TO SOLIDIFY SAID MOLTEN SHEET OF SAID POLYMERIC RESIN, AND REMOVING THE SOLIDIFYED SHEET FROM SAID SURFACE; SAID SURFACE UPON WHICH SAID MOLTEN SHEET OF SAID POLYMERIC RESIN IS EXTRUDED BEING CHARACTERIZED IN HAVING A SATIN FINISH.
Claim 2
Independent Claim
90 words
A METHOD OF FORMING A FLAT SHEET OF A NORMALLY SOLID FILM-FORMING POLYMERIC RESIN WHICH COMPRISES EXTRUDING A MOLTEN SHEET OF SAID POLYMERIC RESIN UPON A CONTINUOUSLY MOVING SATIN-FINISHED SURFACE CHARACTERIZED IN HAVING A ROUGHNESS BETWEEN ABOUT 10 AND 60 R.M.S. MAINAINED AT A TEMPERATURE BELOW THE FUSION TEMPERATURE OF SAID POLYMERIC RESIN TO SOLIDIFY SAID MOLTEN SHEET OF SAID POLYMERIC RESIN, AND REMOVING THE SOLIDIFYED SHEET FROM SAID SURFACE; SAID SURFACE UPON WHICH SAID MOLTEN SHEET OF SAID POLYMERIC RESIN IS EXTRUDED BEING CHARACTERIZED IN HAVING A SATIN FINISH.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1968-10-18 | 1969-04-19 | 1969-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-10-18 | 1973-04-19 | 1973-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-10-18 | 1977-04-19 | 1977-10-19 | $7700.00 | Window Closed / Lapsed |