US3871810A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extruder and roller-die combination
Assignee: UG Licensing Services Inc
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Filing: 1972-11-20
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Granted: 1975-03-18
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Expires: 1992-11-20
Abstract
Abstract An apparatus for forming a continuous elastomeric strip, the method comprising extruding an elastomeric mass under pressure between mutually confronting stationary and movable surfaces, the stationary and movable surfaces converging toward one another and cooperatively defining a pressure chamber therebetween, and reducing the cross-sectional thickness of the elastomeric mass under increased pressure as the latter is passed through a restriction orifice at an end of the chamber. The stationary and movable surfaces, pursuant to the apparatus herein, comprise, respectively, a stationary extrusion die-blade and a driven roller confronted by and spaced from the die-blade.
Inventors
- 👤 Paul Geyer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 11:11
CPC Classifications
B; B29; B29D; B29D30/00; B29D30/06; B29D30/52; B29C; B29C48/00; B29C48/03; B29C48/07; B29C48/25; B29C48/30; B29C48/35; B29C48/92; B29C2948/00; B29C2948/92; B29C2948/92504; B29C2948/9258; B29C2948/9259; B29C2948/92609; B29C2948/92647; B29C2948/92657; B29C2948/92819; B29C2948/92857; B29C2948/92904; B29C48/08; B29L; B29L2030/00; B29L2030/002
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
174 words
Apparatus for forming an elastomeric strip, comprising a roller, a stationary surface confronting and in spaced relation converging toward said roller, said surface and roller cooperatively defining a wedge chamber terminating in a restriction orifice, extrusion means for advancing elastomeric material under pressure to said wedge chamber, and means for defining a transition chamber intercommunicating said extrusion means and said wedge chamber, said transition chamber in one plane of cross-section having a converging portion proximate to and directed away from said extrusion means and a diverging portion remote from and directed away from said extrusion means, said transition chamber in successive downstream planes of crosssection normally of the first said plane having a medial portion which at least in said converging portion progressively narrows at a greater rate than do the respective opposite end portions of said transition chamber in said successive planes, said medial portion of said transition chamber in said successive planes passing through said diverging portion progressively widening in a direction normally of the direction it narrows in said converging portion.
Claim 2
Dependent Claim
174 words
Apparatus for forming an elastomeric strip, comprising a roller, a stationary surface confronting and in spaced relation converging toward said roller, said surface and roller cooperatively defining a wedge chamber terminating in a restriction orifice, extrusion means for advancing elastomeric material under pressure to said wedge chamber, and means for defining a transition chamber intercommunicating said extrusion means and said wedge chamber, said transition chamber in one plane of cross-section having a converging portion proximate to and directed away from said extrusion means and a diverging portion remote from and directed away from said extrusion means, said transition chamber in successive downstream planes of crosssection normally of the first said plane having a medial portion which at least in said converging portion progressively narrows at a greater rate than do the respective opposite end portions of said transition chamber in said successive planes, said medial portion of said transition chamber in said successive planes passing through said diverging portion progressively widening in a direction normally of the direction it narrows in said converging portion.
Claim 3
Dependent Claim
25 words
Apparatus as claimed in claim 1, wherein said medial portion of said transition chamber in said converging portion defines a pair of opposing pointed surfaces.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1978-03-17 | 1978-09-16 | 1979-03-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-03-17 | 1982-09-16 | 1983-03-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-03-17 | 1986-09-16 | 1987-03-18 | $7700.00 | Window Closed / Lapsed |