Patent US1954285A successfully refreshed from Google Patents.
Patent US2283114A successfully refreshed from Google Patents.
Patent US3702224A successfully refreshed from Google Patents.
US3702224A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mandrel for extruded thermoplastic film
Assignee: ExxonMobil Technology and Engineering Co
•
Filing: 1971-03-26
•
Granted: 1972-11-07
•
Expires: 1991-03-26
Abstract
Abstract FIG-01 IN THE EXTRUSION OF A THERMOPLASTIC RESIN THROUGH A RING-DIE IN A GENERALLY DOWNWARD DIRECTION TO FORM A TUBULAR FILM, WHEREIN THE FILM IS PARTIALLY COOLED BY MEANS OF A COOLING GAS BEFORE BEING DRAWN OVER A COOLING AND SIZING MANDREL, THE IMPROVEMENT CHARACTERIZED BY USING A MANDREL HAVING A FLATTENED TOP, AN UNCOOLED UPPER SECTION, A COOLED LOWER SECTION, A TAPERED PROFILE IN LONGITUDINAL CROSS-SECTIONAL AND AN EXTERNAL SURFACE TEXTURE WITHIN THE LIMITS OF 50 TO 1,000 MICROINCHES RMS.
Inventors
- 👤 Howard C North
- 👤 Charles W Williamson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 15:10
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/88; B29C48/90; B29C48/908; B29C48/03; B29C48/09; B29C48/10; B29C48/89; B29C48/901; B29C48/902; B29C48/903; B29C48/911; B29C48/9115; B29C48/912; B29C48/919; B29C2948/00; B29C2948/92; B29C2948/92009; B29C2948/92209; B29C48/001; B29C48/0018; B29C48/0019; B29C48/885; B29C48/907
Claims Analysis
Total Claims: 0
No claims parsed yet. Click Sync Now above to re-index claims from Google Patents.
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) | 1975-11-07 | 1976-05-08 | 1976-11-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-11-07 | 1980-05-08 | 1980-11-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-11-07 | 1984-05-08 | 1984-11-07 | $7700.00 | Window Closed / Lapsed |