US3221084A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Manufacture of polyethylene film
Assignee: EIDP Inc
•
Filing: 1959-05-26
•
Granted: 1965-11-30
•
Expires: 1979-05-26
Abstract
No abstract record available.
Inventors
- 👤 Peticolas Warner Leland
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 12:02
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/88; B29C48/90; B29C48/901; B29C48/902; B29C48/03; B29C48/09; B29C48/10; B29C48/001; B29C48/0018; B29C48/0019
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
92 words
IN THE PRODUCTION OF BLOWN POLYETHYLENE FILM BY DRY EXTRUSION OF POLYETHYLENE THROUGH AN ANNULAR DIE TO FORM A SEAMLESS TUBULAR EXTRUDATE AND EXPANDING THE SAID EXTRUDATE BY INFLATION WITH AIR WHILE SAID TUBE IS IN A FORMATIVE PLASTIC STATE, THE IMPROVEMENT WHICH COMPRISES SUPPLYING RADIANT HEAT TO THE EXTERIOR SURFACE OF SAID EXTRUDATE AS IT EMERGES FROM SAID DIE FROM A SOURCE HAVING A TEMPERATURE OF AT LEAST 200*C. TO RAISE SAID EXTERIOR SURFACE TO A TEMPERATURE GREATER THAN THE EXTRUSION TEMPERATURE BUT LESS THAN THE DEGRADATION TEMPERATURE OF THE EXTRUDATE.
Claim 2
Dependent Claim
92 words
IN THE PRODUCTION OF BLOWN POLYETHYLENE FILM BY DRY EXTRUSION OF POLYETHYLENE THROUGH AN ANNULAR DIE TO FORM A SEAMLESS TUBULAR EXTRUDATE AND EXPANDING THE SAID EXTRUDATE BY INFLATION WITH AIR WHILE SAID TUBE IS IN A FORMATIVE PLASTIC STATE, THE IMPROVEMENT WHICH COMPRISES SUPPLYING RADIANT HEAT TO THE EXTERIOR SURFACE OF SAID EXTRUDATE AS IT EMERGES FROM SAID DIE FROM A SOURCE HAVING A TEMPERATURE OF AT LEAST 200*C. TO RAISE SAID EXTERIOR SURFACE TO A TEMPERATURE GREATER THAN THE EXTRUSION TEMPERATURE BUT LESS THAN THE DEGRADATION TEMPERATURE OF THE EXTRUDATE.
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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) | 1968-11-29 | 1969-05-31 | 1969-11-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1972-11-29 | 1973-05-31 | 1973-11-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1976-11-29 | 1977-05-31 | 1977-11-30 | $7700.00 | Window Closed / Lapsed |