US3321804A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extrusion of wide thermoplastic film and sheet
Assignee: Dow Chemical Co
•
Filing: 1966-03-24
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Granted: 1967-05-30
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Expires: 1986-03-24
Abstract
No abstract record available.
Inventors
- 👤 Jr Peter Breidt
- 👤 Lloyd E Lefevre
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 04:43
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/30; B29C48/305; B29C48/307; B29C48/03; B29C48/07; B29C48/08; B29C48/16; B29C48/18; B29C48/21
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
123 words
AN APPARATUS FOR THE EXTRUSION OF A COMPOSITE THERMOPLASTIC RESINOUS SHEET COMPRISING IN COOPERATIVE OPERATIVE COMBINATION AN EXTRUSION DIE, THE EXTRUSION DIE COMPRISING A HOUSING, THE HOUSING HAVING FIRST PASSAGEWAY SO CONSTRUCTED AND ARRANGED SO AS TO PERMIT STREAMLINE FLOW THEREIN, THE HOUSING DEFINING A FIRST POLYMER ENTRANCE, AND AN OPPOSITELY DISPOSED SLOT-LIKE MAJOR EXTRUSION ORIFICE, MEANS DISTRIBUTED WITHIN THE PASSAGEWAY DEFINING A PLURALITY OF GENERALLY SLOT-LIKE MINOR EXTRUSION ORIFICES, EACH MINOR EXTRUSION ORIFICE ADAPTED TO DELIVER A SHEET-LIKE STREAM OF MATERIAL INTO A MATERIAL FLOWING WITHIN THE FIRST PASSAGEWAY, THE MINOR EXTRUSION ORIFICES ALTERNATELY EXTENDING FROM OPPOSITE WALLS OF THE PASSAGEWAY FOR A DISTANCE SOMEWHAT LESS THAN THE TOTAL WIDTH OF THE PASSAGEWAY, AND THE MINOR ORIFICES BEING DISTRIBUTED IN INTERDIGITATING RELATIONSHIP.
Claim 2
Independent Claim
123 words
AN APPARATUS FOR THE EXTRUSION OF A COMPOSITE THERMOPLASTIC RESINOUS SHEET COMPRISING IN COOPERATIVE OPERATIVE COMBINATION AN EXTRUSION DIE, THE EXTRUSION DIE COMPRISING A HOUSING, THE HOUSING HAVING FIRST PASSAGEWAY SO CONSTRUCTED AND ARRANGED SO AS TO PERMIT STREAMLINE FLOW THEREIN, THE HOUSING DEFINING A FIRST POLYMER ENTRANCE, AND AN OPPOSITELY DISPOSED SLOT-LIKE MAJOR EXTRUSION ORIFICE, MEANS DISTRIBUTED WITHIN THE PASSAGEWAY DEFINING A PLURALITY OF GENERALLY SLOT-LIKE MINOR EXTRUSION ORIFICES, EACH MINOR EXTRUSION ORIFICE ADAPTED TO DELIVER A SHEET-LIKE STREAM OF MATERIAL INTO A MATERIAL FLOWING WITHIN THE FIRST PASSAGEWAY, THE MINOR EXTRUSION ORIFICES ALTERNATELY EXTENDING FROM OPPOSITE WALLS OF THE PASSAGEWAY FOR A DISTANCE SOMEWHAT LESS THAN THE TOTAL WIDTH OF THE PASSAGEWAY, AND THE MINOR ORIFICES BEING DISTRIBUTED IN INTERDIGITATING RELATIONSHIP.
References Cited (Backward Citations)
US1603813A
Cited
US2047395A
Cited
US2249311A
Cited
US2803041A
Cited
US3274646A
Cited
US3213808A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1970-05-29 | 1970-11-28 | 1971-05-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1974-05-29 | 1974-11-28 | 1975-05-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1978-05-29 | 1978-11-28 | 1979-05-30 | $7700.00 | Window Closed / Lapsed |