US4054403A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extruder with dual flighted extrusion screw
Assignee: GE Chemicals Inc
•
Filing: 1976-08-16
•
Granted: 1977-10-18
•
Expires: 1996-08-16
Abstract
Abstract An extruder has a single screw with two separate inlet hoppers feeding two separate screw flights to deliver two separate materials to a multiple channel extruder die.
Inventors
- 👤 Robert Lee Hornbeck
- 👤 Norman John Brozenick
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:08
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/03; B29C48/07; B29C48/08; B29C48/09; B29C48/16; B29C48/18; B29C48/21; B29C48/25; B29C48/285; B29C48/288; B29C48/30; B29C48/304; B29C48/32; B29C48/335; B29C48/336; B29C48/3366; B29C48/337; B29C48/338; B29C48/36; B29C48/50; B29C48/505; B29C48/64; B29C48/286
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
136 words
A screw extruder adapted to convey thermoplastic materials from inlet to outlet in separate streams comprising a screw body rotatable within a barrel defining a cylindrical chamber having an inner wall, a feed inlet at one end of said chamber and a shaping die on the other end thereof, said screw body having a plurality of different, parallel flights on its outer surface providing a plurality of different parallel channels or passageways between the outer surface of the screw body and the inner wall of the barrel throughout substantially the axial extent of said chamber from said inlet to said die to prevent any mixing of the materials, and a plurality of separate feed hoppers connected to said feed inlet adapted to feed thermoplastic materials separately to the plurality of different parallel channels or passageways simultaneously.
Claim 2
Dependent Claim
136 words
A screw extruder adapted to convey thermoplastic materials from inlet to outlet in separate streams comprising a screw body rotatable within a barrel defining a cylindrical chamber having an inner wall, a feed inlet at one end of said chamber and a shaping die on the other end thereof, said screw body having a plurality of different, parallel flights on its outer surface providing a plurality of different parallel channels or passageways between the outer surface of the screw body and the inner wall of the barrel throughout substantially the axial extent of said chamber from said inlet to said die to prevent any mixing of the materials, and a plurality of separate feed hoppers connected to said feed inlet adapted to feed thermoplastic materials separately to the plurality of different parallel channels or passageways simultaneously.
Claim 3
Dependent Claim
129 words
A screw extruder adapted to convey two separate thermoplastic materials from inlet to outlet in separate streams comprising a screw body rotatable within a barrel defining a cylindrical chamber, a feed inlet at one end of said chamber and a shaping die on the other end thereof, said screw body having two different, parallel flights on its outer surface providing two different parallel channels or passageways between the outer surface of the screw body and the inner wall of the barrel throughout substantially the axial extent of said chamber from said inlet to said die to prevent any mixing of the materials, and two separate feed hoppers connected to said feed inlet adapted to feed the two separate thermoplastic materials to the two different parallel channels or passageways simultaneously.
Claim 4
Dependent Claim
129 words
A screw extruder adapted to convey two separate thermoplastic materials from inlet to outlet in separate streams comprising a screw body rotatable within a barrel defining a cylindrical chamber, a feed inlet at one end of said chamber and a shaping die on the other end thereof, said screw body having two different, parallel flights on its outer surface providing two different parallel channels or passageways between the outer surface of the screw body and the inner wall of the barrel throughout substantially the axial extent of said chamber from said inlet to said die to prevent any mixing of the materials, and two separate feed hoppers connected to said feed inlet adapted to feed the two separate thermoplastic materials to the two different parallel channels or passageways simultaneously.
References Cited (Backward Citations)
CH343839A
Cited
US3314108A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-17 | 1981-04-18 | 1981-10-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-17 | 1985-04-18 | 1985-10-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-17 | 1989-04-18 | 1989-10-18 | $7700.00 | Window Closed / Lapsed |