Patent US4056344A successfully refreshed from Google Patents.
US4056344A
Expired / Lapsed
US
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Apparatus for producing composite extrusions
Assignee: Individual
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Filing: 1972-12-29
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Granted: 1977-11-01
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Expires: 1992-12-29
Abstract
Abstract An apparatus and method are provided for producing extrusions of two or more materials such as plastic polymers so as to utilize the characteristics of both materials in a single formation thereof. In one form, flexible and rigid polymers are coextruded through a common die to form selected portions of the length of an extrusion or to form portions of the length of an extrusion composed of one polymer and other portions composed of the same polymer plus a second polymer. Tubing may be formed having portions of its length made completely of a flexible polymer and other portions thereof made of a rigid polymer. The apparatus mahy also form rigid pipe having elastomeric material coated or extruded along selected lengths thereof such that when severed along said lengths, selected pipes may be formed thereof containing end seals formed integral with each length.
Inventors
- 👤 Jerome H. Lemelson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 13:12
CPC Classifications
B; B29; B29C; B29C53/00; B29C53/22; B29C53/30; B29C48/00; B29C48/03; B29C48/09; B29C48/16; B29C48/18; B29C48/19; B29C48/21; B29C48/25; B29C48/30; B29C48/32; B29C48/325; B29C48/335; B29C48/36; B29C48/49; B29C49/00; B29C49/22; B29C57/00; B29C57/02; B29C57/08; B29C48/001; B29C48/0022
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
158 words
An apparatus for forming an integrally molded article of at least two different thermoplastic materials comprising: a die to define a predetermined shaped article, a first variably controllable means operatively associated with said die for introducing a first melt material into said die, a second variably controllable means operatively associated with said die for introducing a second melt material into said die whereby said first and second materials occupy selected portions of said shaped article defined by said die to form a composite molded article of said materials, and a control means operatively associated with first and second variably control means for variably controlling said first and second variably controllable means for predeterminately activating said first and second means so as to variably control the introduction of said first and second melt materials into said die during a forming operation whereby the formed thermoplastic article will embody the attributes and characteristics of the respective first and second materials.
Claim 2
Independent Claim
158 words
An apparatus for forming an integrally molded article of at least two different thermoplastic materials comprising: a die to define a predetermined shaped article, a first variably controllable means operatively associated with said die for introducing a first melt material into said die, a second variably controllable means operatively associated with said die for introducing a second melt material into said die whereby said first and second materials occupy selected portions of said shaped article defined by said die to form a composite molded article of said materials, and a control means operatively associated with first and second variably control means for variably controlling said first and second variably controllable means for predeterminately activating said first and second means so as to variably control the introduction of said first and second melt materials into said die during a forming operation whereby the formed thermoplastic article will embody the attributes and characteristics of the respective first and second materials.
Claim 3
Dependent Claim
54 words
An apparatus in accordance with claim 1, said variable control means operatively associated with said first and second variably control means being operable to cyclically vary a number of times during the forming operation and to repeatedly form substantially the same variations in the composition of the article at selected portions of said article.
Claim 4
Dependent Claim
45 words
An apparatus in accordance with claim 1 wherein said die is shaped for extruding a tube and said flow varying means is operable to form tubing having its wall composed of said first and second materials which predeterminately vary along the length of the tube.
Claim 5
Dependent Claim
31 words
An apparatus in accordance with claim 3 said first variably controllable means being operable to provide variations in the composition of the outer stratum of the extruded tubing along its length.
Claim 6
Dependent Claim
32 words
An apparatus in accordance with claim 3, said second variably controllable means being operable to provide variations in the composition of the inner stratum of the extruded tubing wall along its length.
Claim 7
Dependent Claim
86 words
An apparatus in accordance with claim 3 wherein said first and second means is operable to alternately flow a first of said materials to said die while preventing the flow of the second material to said die and to thereafter cause the flow of said second material while preventing the flow of said first material so as to form an extrusion which is composed of alternate attached lengths of said respective two materials with the portions of each material defining the complete cross-section of the extrusion.
Claim 8
Dependent Claim
51 words
An apparatus in accordance with claim 3 wherein said extrusion die is operable to form tubing and said first and second means being operable to form a tubing having cross sectional portions composed entirely of one of said materials and interposed between other cross sectional portions composed of both said materials.
Claim 9
Dependent Claim
168 words
An extrusion apparatus comprising an extruder having a die containing an opening, a mandrel disposed in said die opening, a first means associated with said die for variably forcing a first extrusion material through said die opening and over said mandrel to form a tubular extrusion thereof a second means operatively associated with said die for variably forcing the flow of a second extrusion material and causing said second material to combine with said first extrusion material along selected portions of the length of said tubular extrusion formed of said first material and to form tubular formations of said second extrusion material along selected portions of the extrusion so as to define a composite tubular extrusion formed primarily of said first extrusion material and having circumscribing portions of its wall composed of said second extrusion material at predetermined intervals along its length, and control means operatively associated with said first and second means for variably controlling the flow of said first and second extrusion materials to said die.
Claim 10
Dependent Claim
168 words
An extrusion apparatus comprising an extruder having a die containing an opening, a mandrel disposed in said die opening, a first means associated with said die for variably forcing a first extrusion material through said die opening and over said mandrel to form a tubular extrusion thereof a second means operatively associated with said die for variably forcing the flow of a second extrusion material and causing said second material to combine with said first extrusion material along selected portions of the length of said tubular extrusion formed of said first material and to form tubular formations of said second extrusion material along selected portions of the extrusion so as to define a composite tubular extrusion formed primarily of said first extrusion material and having circumscribing portions of its wall composed of said second extrusion material at predetermined intervals along its length, and control means operatively associated with said first and second means for variably controlling the flow of said first and second extrusion materials to said die.
Claim 11
Dependent Claim
28 words
An extrusion apparatus in accordance with claim 8 wherein said variable forcing control means for said first and second extrusion material to said die includes a program controller.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1980-10-31 | 1981-05-02 | 1981-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-10-31 | 1985-05-02 | 1985-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-10-31 | 1989-05-02 | 1989-11-01 | $7700.00 | Window Closed / Lapsed |