US3281897A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extruded plastic tubing
Assignee: Plastic Textile Accessories Ltd
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Filing: 1964-02-12
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Granted: 1966-11-01
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Expires: 1984-02-12
Abstract
No abstract record available.
Inventors
- 👤 Mercer Frank Brian
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 17:33
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/30; B29C48/32; B29C48/33; B29C48/03; B29C48/09
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
116 words
APPARATUS FOR EXTRUDING PLASTIC TUBING COMPRISING MEANS FOR FEEDING PLASTIC UNDER PRESSURE TO A PAIR OF CIRCULAR DIE CARRYING MEMBERS HAVING CONTACTING SLIDEWAYS AND, ON EACH SIDE OF THE SLIDEWAYS, CIRCUMFERENTIALLY SPACED DIE ORIFICE MEANS, THE DIE ORIFICE MEANS FEEDING A CONVERGENT ANNULAR-SECTION PASSAGEWAY FORMED BETWEEN INCLINED WALL SURFACES ONE OF EACH DIE MEMBER AND THE CONVERGENT PASSAGEWAY FEEDING AN ANNULAR TUBE EXTRUSION SLOT OF SMALLER DIAMETER THAN THAT OF THE SLIDEWAYS AND CORRESPONDING TO THE DIMENSION OF THE TUBULAR PRODUCT REQUIRED, AND MEANS FOR RELATIVELY DISPLACING THE DIE MEMBERS ABOUT THEIR COMMON AXIS, SO THAT THE DIE ORIFICES, THE WALLS DEFINING THE CONVERGENT PASSAGEWAY AND THE WALLS DEFINING THE TUBE EXTRUSION SLOT ARE RELATIVELY COUNTERROTATED.
Claim 2
Dependent Claim
116 words
APPARATUS FOR EXTRUDING PLASTIC TUBING COMPRISING MEANS FOR FEEDING PLASTIC UNDER PRESSURE TO A PAIR OF CIRCULAR DIE CARRYING MEMBERS HAVING CONTACTING SLIDEWAYS AND, ON EACH SIDE OF THE SLIDEWAYS, CIRCUMFERENTIALLY SPACED DIE ORIFICE MEANS, THE DIE ORIFICE MEANS FEEDING A CONVERGENT ANNULAR-SECTION PASSAGEWAY FORMED BETWEEN INCLINED WALL SURFACES ONE OF EACH DIE MEMBER AND THE CONVERGENT PASSAGEWAY FEEDING AN ANNULAR TUBE EXTRUSION SLOT OF SMALLER DIAMETER THAN THAT OF THE SLIDEWAYS AND CORRESPONDING TO THE DIMENSION OF THE TUBULAR PRODUCT REQUIRED, AND MEANS FOR RELATIVELY DISPLACING THE DIE MEMBERS ABOUT THEIR COMMON AXIS, SO THAT THE DIE ORIFICES, THE WALLS DEFINING THE CONVERGENT PASSAGEWAY AND THE WALLS DEFINING THE TUBE EXTRUSION SLOT ARE RELATIVELY COUNTERROTATED.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1969-10-31 | 1970-05-02 | 1970-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1973-10-31 | 1974-05-02 | 1974-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1977-10-31 | 1978-05-02 | 1978-11-01 | $7700.00 | Window Closed / Lapsed |