Patent US5009825A successfully refreshed from Google Patents.
US5009825A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Production of extruded round rod
Assignee: Individual
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Filing: 1989-06-30
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Granted: 1991-04-23
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Expires: 2009-06-30
Abstract
Abstract A method of producing round rod formed of thermoplastic material by extrusion is described. The rod, following extrusion, is first heated and then cooled while rotating fully supported on rollers. The rollers impart a concentric outer surface shape to the extruded rods and permit uniform cooling across the entire cross section of the extruded rod.
Inventors
- 👤 Mark Lurie
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 22:14
CPC Classifications
B; B29; B29C; B29C67/00; B29C48/00; B29C48/03; B29C48/06; B29C35/00; B29C35/02; B29C35/16; B29C48/001; B29C48/0018; B29C48/0022; B29L; B29L2031/00; B29L2031/06
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
100 words
In a method of producing a round rod formed of thermoplastic material by extrusion in a conventional extruder, the improvement which comprises the steps in sequence of: A. cooling the extruded rod as it is expressed from the extruder; B. cutting the extruded rod to a predetermined length; C. heating the cut extruded rod from step B to a temperature above the glass transition temperature of the rod while rotating the rod fully supported on roller means; and D. cooling the heated rod from step C at a controlled rate while rotating the rod fully supported on said roller means.
Claim 2
Dependent Claim
100 words
In a method of producing a round rod formed of thermoplastic material by extrusion in a conventional extruder, the improvement which comprises the steps in sequence of: A. cooling the extruded rod as it is expressed from the extruder; B. cutting the extruded rod to a predetermined length; C. heating the cut extruded rod from step B to a temperature above the glass transition temperature of the rod while rotating the rod fully supported on roller means; and D. cooling the heated rod from step C at a controlled rate while rotating the rod fully supported on said roller means.
Claim 3
Dependent Claim
19 words
In a method according to claim 1, the improvement wherein the roller means is rotated at a constant speed.
Claim 4
Dependent Claim
25 words
In a method in accordance with claim 1, the improvement wherein said rods are maintained at a temperature below the glass transition of the rod.
Claim 5
Dependent Claim
17 words
In a method according to claim 1, the improvement wherein said polymeric rod comprises an acrylic rod.
Claim 6
Dependent Claim
22 words
In a method according to claim 1 wherein said rod, upon cooling is substantially free of all internal stresses, bubbles and voids.
Claim 7
Dependent Claim
19 words
In a method according to claim 1, the improvement wherein said rods are slowly and uniformly cooled following extrusion.
Claim 8
Dependent Claim
16 words
In a method according to claim 6, the improvement wherein said rods are insulated during cooling.
Claim 9
Dependent Claim
20 words
In a method according to claim 6, the improvement wherein said rods are subjected to low level heat during cooling.
Claim 10
Dependent Claim
63 words
Apparatus for producing round rod formed of thermoplastic material, comprising an extruder for forming a round rod, and a post-extrusion heat treating means comprising an oven containing a plurality of rollers having axis parallel to one another for rotating and fully supporting said rod with the axis of the rod parallel to the axis of said rollers for a predetermined period of time.
Claim 11
Dependent Claim
63 words
Apparatus for producing round rod formed of thermoplastic material, comprising an extruder for forming a round rod, and a post-extrusion heat treating means comprising an oven containing a plurality of rollers having axis parallel to one another for rotating and fully supporting said rod with the axis of the rod parallel to the axis of said rollers for a predetermined period of time.
Claim 12
Dependent Claim
24 words
Apparatus according to claim 9, and including means for maintaining said rollers at a temperature different from the free space temperature of the oven.
Claim 13
Dependent Claim
22 words
Apparatus according to claim 9 wherein said rollers are formed of metal coated on the outer surface with a polyethylene terephthalate coating.
Claim 14
Dependent Claim
26 words
Apparatus according to claim 10 wherein said rollers are hollow at least in part, and including means for circulating a heat exchange fluid through said rollers.
Claim 15
Dependent Claim
24 words
Apparatus according to claim 9, and further including means for slowing the rate of cooling of said rods following extrusion to their solid state.
Claim 16
Dependent Claim
18 words
Apparatus according to claim 13, wherein said means for slowing the rate of cooling comprises heat insulating means.
Claim 17
Dependent Claim
17 words
Apparatus according to claim 13, wherein said means for slowing the rate of cooling comprises heating means.
Claim 18
Dependent Claim
13 words
Apparatus according to claim 15, wherein said heating means comprises convection heating means.
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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) | 1994-04-22 | 1994-10-22 | 1995-04-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-04-22 | 1998-10-22 | 1999-04-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-04-22 | 2002-10-22 | 2003-04-23 | $7700.00 | Window Closed / Lapsed |