Patent US3221370A successfully refreshed from Google Patents.
US3221370A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for extruding thermoplastic film
Assignee: Millennium Petrochemicals Inc
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Filing: 1963-02-06
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Granted: 1965-12-07
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Expires: 1983-02-06
Abstract
No abstract record available.
Inventors
- 👤 Herbert O Corbett
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 15:58
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/88; B29C48/90; B29C48/901; B29C48/903; B29C48/03; B29C48/07; B29C48/08; B29C48/09; B29C48/10; B29C48/30; B29C48/32; B29C48/911; B29C48/9115; B29C48/912; B29C48/001; B29C48/0018; B29C48/0019; B29C48/885; B29C48/9135; B29C48/914
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
130 words
AN APPARATUS FOR PRODUCING TUBE-TYPE EXTRUDED FILMS OF MOLTEN THERMOPLASTIC MATERIALS, COMPRISING AN EXTRUDER HEAD, INCLUDING A PAIR OF LONGITUDINALLY OPPOSED, SPACED DIE LIPS FORMING A CHANNEL INTERMEDIATE THEIR OPPOSED SIDE SURFACE PORTIONS, AND AIR BLADE DISPOSED IN SAID CHANNEL TO EXTEND LONGITUDINALLY THREOF AND DISPOSED THEREIN FOR LATERALLY SPACED RELATION AND SAID RESPECTIVE DIE LIP SIDE SURFACE PORTIONS, WHEREBY TO DIVIDE SAID CHANNEL INTO TWO PARALLEL PORTIONS, SAID BLADE TERMINATING AT EACH END IN SAID SPACED RELATION TO THE RESPECTIVE ENDS OF SAID DIE LIPS, MEANS AT EACH END OF SAID DIE LIPS, SPACED FROM SAID AIR BLADE, TO CLOSE SAID CHANNEL ENDS, AND MEANS FOR DEFINING A PASSAGEWAY BETWEEN THE END PORTIONS, OF SAID AIR BLADE WHICH PASSAGEWAY IS CONTINUOUS WITH SAID TWO PARALLEL PORTIONS OF SAID CHANNEL.
Claim 2
Independent Claim
130 words
AN APPARATUS FOR PRODUCING TUBE-TYPE EXTRUDED FILMS OF MOLTEN THERMOPLASTIC MATERIALS, COMPRISING AN EXTRUDER HEAD, INCLUDING A PAIR OF LONGITUDINALLY OPPOSED, SPACED DIE LIPS FORMING A CHANNEL INTERMEDIATE THEIR OPPOSED SIDE SURFACE PORTIONS, AND AIR BLADE DISPOSED IN SAID CHANNEL TO EXTEND LONGITUDINALLY THREOF AND DISPOSED THEREIN FOR LATERALLY SPACED RELATION AND SAID RESPECTIVE DIE LIP SIDE SURFACE PORTIONS, WHEREBY TO DIVIDE SAID CHANNEL INTO TWO PARALLEL PORTIONS, SAID BLADE TERMINATING AT EACH END IN SAID SPACED RELATION TO THE RESPECTIVE ENDS OF SAID DIE LIPS, MEANS AT EACH END OF SAID DIE LIPS, SPACED FROM SAID AIR BLADE, TO CLOSE SAID CHANNEL ENDS, AND MEANS FOR DEFINING A PASSAGEWAY BETWEEN THE END PORTIONS, OF SAID AIR BLADE WHICH PASSAGEWAY IS CONTINUOUS WITH SAID TWO PARALLEL PORTIONS OF SAID CHANNEL.
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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) | 1968-12-06 | 1969-06-07 | 1969-12-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-12-06 | 1973-06-07 | 1973-12-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-12-06 | 1977-06-07 | 1977-12-07 | $7700.00 | Window Closed / Lapsed |