US4256685A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Variable profile extrusion method
Assignee: Individual
•
Filing: 1978-11-24
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Granted: 1981-03-17
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Expires: 1998-11-24
Abstract
Abstract An improved method is described for varying the profile as seen in cross section of an elongated extrudate article. The method provides for varying the profile of an extrusion orifice while an extrudate stock material is being forced through the orifice. An elongated extruded article is formed having a varying profile conforming to the variations in the profile of the extrusion orifice.
Inventors
- 👤 Clyde W. Vassar
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 13:44
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/25; B29C48/30; B29C48/302; B29C48/03; B29C48/12; B29C48/13; B29C48/001; B29C48/0022
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
173 words
A method for extruding an elongated article having a profile which remains the same in at least one radial direction along its length and which may be varied in at least three other radial directions along its length comprising the steps of: forming an orifice in a fixed die member which is stationary in at least one radial direction and which may be varied in at least three other radial directions using a plurality of movable extrusion die members, forcing a thermoplastic extrudate stock material in flowable form through said orifice, and varying the position of at least two of said movable die members while forcing said stock material through said orifice thereby maintaining the profile the same in at least one radial direction while simultaneously varying the profile of the orifice in at least two other radial directions for forming an elongated extrudate article having a constant profile in at least one radial direction and a varying profile in at least two radial directions conforming to the varying profile of said orifice.
Claim 2
Independent Claim
173 words
A method for extruding an elongated article having a profile which remains the same in at least one radial direction along its length and which may be varied in at least three other radial directions along its length comprising the steps of: forming an orifice in a fixed die member which is stationary in at least one radial direction and which may be varied in at least three other radial directions using a plurality of movable extrusion die members, forcing a thermoplastic extrudate stock material in flowable form through said orifice, and varying the position of at least two of said movable die members while forcing said stock material through said orifice thereby maintaining the profile the same in at least one radial direction while simultaneously varying the profile of the orifice in at least two other radial directions for forming an elongated extrudate article having a constant profile in at least one radial direction and a varying profile in at least two radial directions conforming to the varying profile of said orifice.
Claim 3
Dependent Claim
27 words
The method of claim 1, wherein said article is formed during an extrudate forming cycle and the position of said members is varied continuously during said cycle.
Claim 4
Dependent Claim
29 words
The method of claim 1, wherein said article is formed during an extrudate forming cycle and the position of said members is varied during a part of said cycle.
Claim 5
Dependent Claim
23 words
The method of claim 1, wherein the positions of at least three members are varied while forcing said stock material through said orifice.
References Cited (Backward Citations)
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Cited
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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) | 1984-03-16 | 1984-09-15 | 1985-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-03-16 | 1988-09-15 | 1989-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-03-16 | 1992-09-15 | 1993-03-17 | $7700.00 | Window Closed / Lapsed |