US2821746A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for extruding films
Assignee: EIDP Inc
•
Filing: 1954-01-25
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Granted: 1958-02-04
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Expires: 1974-01-25
Abstract
No abstract record available.
Inventors
- 👤 Jr Leo B Bicher
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 00:45
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/30; B29C48/305; B29C48/03; B29C48/07; B29C48/08
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
72 words
AN APPARATUS COMPRISING AN EXTRUSION DIE HAVING A NARROW RECTANGULAR SLOT ORIFICE, ONE LENGTHWISE LIP THEREOF DEFINING SUCH ORIFICE BEING STRAIGHT AND THE OTHER BEING STRAIGHT EXCEPT FOR TWO SPACED BEAD-FORMING SLOTS OF SMALL CROSS-SECTION, A REVOLUBLE CASING DRUM BENEATH SAID DIE AND ADJACENT SAID DRUM A BEAD-SHAPING ROLL HAVING CIRCUMFERENTIAL SPACED BEAD-SHAPING GROOVES, SAID ROLL BEING ADAPTED TO PRESS AGAINST A FILM EXTRUDED THROUGH SAID ORIFICE AND CARRIED BY SAID DRUM.
Claim 2
Independent Claim
72 words
AN APPARATUS COMPRISING AN EXTRUSION DIE HAVING A NARROW RECTANGULAR SLOT ORIFICE, ONE LENGTHWISE LIP THEREOF DEFINING SUCH ORIFICE BEING STRAIGHT AND THE OTHER BEING STRAIGHT EXCEPT FOR TWO SPACED BEAD-FORMING SLOTS OF SMALL CROSS-SECTION, A REVOLUBLE CASING DRUM BENEATH SAID DIE AND ADJACENT SAID DRUM A BEAD-SHAPING ROLL HAVING CIRCUMFERENTIAL SPACED BEAD-SHAPING GROOVES, SAID ROLL BEING ADAPTED TO PRESS AGAINST A FILM EXTRUDED THROUGH SAID ORIFICE AND CARRIED BY SAID DRUM.
Claim 3
Dependent Claim
68 words
THE PROCESS WHICH COMPRISES EXTRUDING A FILM OF THERMOPLASTIC POLYMER, IN THE FORM OF A SHEET HAVING ONE SMOOTH SURFACE AND HAVING TWO SPACED BEADS OF SMALL CROSS-SECTION ON THE OTHER SURFACE, ONTO A CASTING DRUM AND SHAPING SAID BEADS BY ROTATING, IN CONTACT WITH SAID EXTRUDED FILM, A BEAD-SHAPING ROLL HAVING SIMILARLY SHAPED GROOVES, SAID LATTER GROOVES CONTACTING THE BEADS ON THE OUTER SURFACE OF THE FILM.
Claim 4
Dependent Claim
68 words
THE PROCESS WHICH COMPRISES EXTRUDING A FILM OF THERMOPLASTIC POLYMER, IN THE FORM OF A SHEET HAVING ONE SMOOTH SURFACE AND HAVING TWO SPACED BEADS OF SMALL CROSS-SECTION ON THE OTHER SURFACE, ONTO A CASTING DRUM AND SHAPING SAID BEADS BY ROTATING, IN CONTACT WITH SAID EXTRUDED FILM, A BEAD-SHAPING ROLL HAVING SIMILARLY SHAPED GROOVES, SAID LATTER GROOVES CONTACTING THE BEADS ON THE OUTER SURFACE OF THE FILM.
References Cited (Backward Citations)
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US2175961A
Cited
US2212770A
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US2249311A
Cited
US2439939A
Cited
US2628386A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1961-02-03 | 1961-08-05 | 1962-02-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1965-02-03 | 1965-08-05 | 1966-02-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1969-02-03 | 1969-08-05 | 1970-02-04 | $7700.00 | Window Closed / Lapsed |