Patent US3216038A successfully refreshed from Google Patents.
Patent US2821746A successfully refreshed from Google Patents.
US2821746A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for extruding films
Assignee: EIDP Inc
•
Filing: 1954-01-25
•
Granted: 1958-02-04
•
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 09:19
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)
US2736066A
Cited
US2175961A
Cited
US2212770A
Cited
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 |