Patent US3738420A successfully refreshed from Google Patents.
US3738420A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus and method for controlling temperature in a feed screw
Assignee: Phillips Petroleum Co
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Filing: 1971-02-10
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Granted: 1973-06-12
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Expires: 1991-02-10
Abstract
Abstract A feed screw for advancing a thermoplastic resin has an interior bore through which a cooling medium is adapted to be circulated by conduits entering from an open entrance end of the bore. Adjustable means inserted into the bore forms a desired bore segment through which the cooling medium is freely circulated, thereby providing a desired temperature gradient along the screw length.
Inventors
- 👤 R Poux
- 👤 P Deutsch
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 16:20
CPC Classifications
B; B29; B29C; B29C45/00; B29C45/17; B29C45/72; B29C45/74; B29C48/00; B29C48/25; B29C48/36; B29C48/50; B29C48/505; B29C48/51; B29C48/515; B29C48/78; B29C48/80; B29C48/84; B29C48/845; B29C48/85; B29C48/875; B29C48/03
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
179 words
The method of maintaining desired temperature gradients in a screw adapted to advance plastic material and having an interior bore through which a temperature-control fluid is adapted to circulate, said bore having an open entrance end and a terminating end disposed adjacent a tip of said screw, the method comprising the steps of positioning an adjustably positionable apertured baffle means in said bore relative to said open entrance end until a first desired bore length extending between said open entrance end and said baffle means and a second desired bore length extending between said baffle means and said terminating end are attained, circulating a temperature-control fluid through said first bore length at a first rate of circulation, a portion of said temperature-control fluid passing through the baffle means aperture whereby said portion of said circulating fluid circulates through said second bore length at a second rate of circulation which is less than that of said first rate of circulation, the circulating temperature-control fluid being in direct contact with interior screw wall portions defining said first and second bore lengths.
Claim 2
Independent Claim
179 words
The method of maintaining desired temperature gradients in a screw adapted to advance plastic material and having an interior bore through which a temperature-control fluid is adapted to circulate, said bore having an open entrance end and a terminating end disposed adjacent a tip of said screw, the method comprising the steps of positioning an adjustably positionable apertured baffle means in said bore relative to said open entrance end until a first desired bore length extending between said open entrance end and said baffle means and a second desired bore length extending between said baffle means and said terminating end are attained, circulating a temperature-control fluid through said first bore length at a first rate of circulation, a portion of said temperature-control fluid passing through the baffle means aperture whereby said portion of said circulating fluid circulates through said second bore length at a second rate of circulation which is less than that of said first rate of circulation, the circulating temperature-control fluid being in direct contact with interior screw wall portions defining said first and second bore lengths.
Claim 3
Dependent Claim
35 words
The method of claim 1 in which the rate of circulation of said temperature-control fluid in said first desired bore length is modified by repositioning said baffle means along the bore length of said screw.
Claim 4
Dependent Claim
31 words
The method of claim 1 in which the circulation of said temperature-control fluid in said second bore length is modified by changing the size of the aperture in said baffle means.
References Cited (Backward Citations)
US3007198A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-06-11 | 1976-12-11 | 1977-06-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-06-11 | 1980-12-11 | 1981-06-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-06-11 | 1984-12-11 | 1985-06-12 | $7700.00 | Window Closed / Lapsed |