US4251201A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extrusion apparatus
Assignee: Individual
•
Filing: 1978-09-18
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Granted: 1981-02-17
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Expires: 1998-09-18
Abstract
Abstract Extrusion apparatus for production of a shaped article comprising one or more filling materials enclosed in a coating material. Included in the apparatus are inner and outer conduits through which the materials are extruded toward an iris valve adjacent the terminal portion of the outer conduit. An inner conduit preferably terminates within the outer conduit at a distance from the iris valve equal to the distance between outer surface of the inner conduit and inner surface of the outer conduit. Operation of the iris valve both determines the length of the article and the shape of forward and rearward ends of the article.
Inventors
- 👤 Janusz D. Krysiak
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 16:39
CPC Classifications
B; B30; B30B; B30B11/00; B30B11/34; A; A21; A21C; A21C11/00; A21C11/16; A21C11/163; A23; A23P; A23P30/00; A23P30/20; A23P30/25; B30B11/22
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
147 words
Apparatus for preparation of a shaped article having a forward and rearward portion and wherein a coating material encloses a filling material, said apparatus comprising: inner and outer longitudinally-extending extrusion conduits, said outer conduit being of greater length than said inner conduit; means for intermittently supplying a coating material to and through said outer conduit; means for intermittently supplying a filling material to and through said inner conduit; iris valve means adjacent the terminal portion of said outer conduit for smoothly shaping forward and rearward portions of the article, said iris valve means providing leaf closure means reversibly movable from an initial position, wherein they occlude said outer conduit, through intermediate positions wherein they partially occlude said outer conduit to a final position wherein they do not occlude said outer conduit; and, means for sequentially activating the operation of said supply means and said iris valve means.
Claim 2
Dependent Claim
147 words
Apparatus for preparation of a shaped article having a forward and rearward portion and wherein a coating material encloses a filling material, said apparatus comprising: inner and outer longitudinally-extending extrusion conduits, said outer conduit being of greater length than said inner conduit; means for intermittently supplying a coating material to and through said outer conduit; means for intermittently supplying a filling material to and through said inner conduit; iris valve means adjacent the terminal portion of said outer conduit for smoothly shaping forward and rearward portions of the article, said iris valve means providing leaf closure means reversibly movable from an initial position, wherein they occlude said outer conduit, through intermediate positions wherein they partially occlude said outer conduit to a final position wherein they do not occlude said outer conduit; and, means for sequentially activating the operation of said supply means and said iris valve means.
Claim 3
Dependent Claim
42 words
The apparatus of claim 1 wherein said inner conduit terminates within said outer conduit at a distance from said iris valve means equal to the distance separating the inner surface of said outer conduit and the outer surface of said inner conduit.
Claim 4
Dependent Claim
14 words
The apparatus of claim 1 wherein said inner and outer conduits are geometrically similar.
Claim 5
Dependent Claim
16 words
The apparatus of claim 3 wherein said inner and outer conduits are circular in cross section.
Claim 6
Dependent Claim
13 words
The apparatus of claim 1 wherein said inner and outer conduits are concentric.
Claim 7
Dependent Claim
18 words
The apparatus of claim 1 wherein said iris valve means generates a polygonal aperture approximating a circular shape.
Claim 8
Dependent Claim
18 words
The apparatus of claim 1 and including a plurality of inner conduts axially aligned with said outer conduit.
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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) | 1984-02-17 | 1984-08-18 | 1985-02-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-02-17 | 1988-08-18 | 1989-02-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-02-17 | 1992-08-18 | 1993-02-17 | $7700.00 | Window Closed / Lapsed |