US3846529A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Extrusion cutting device
Assignee: WR Grace and Co Conn
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Filing: 1973-06-28
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Granted: 1974-11-05
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Expires: 1993-06-28
Abstract
Abstract The device of this invention cuts multiple extrudates to a constant length while at the same time preventing any bending and resulting weakening of the extrudates. These extrusions are cut by a gaseous pressure source by directing this gaseous pressure in the area of the extruder die face. When the extrusion is of a preprogrammed length, the gaseous force on the extrudate will be sufficient to shear the material at the die face. An essentially opposing gaseous pressure force may be used in conjunction with the basic gaseous shearing structure. Inorganic extrudates are very effectively sheared using this device.
Inventors
- 👤 C Poteet
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 04:20
CPC Classifications
B; B01; B01J; B01J2/00; B01J2/20; B28; B28B; B28B11/00; B28B11/14; B28B11/16; B28B17/00; B28B17/0036; B29; B29B; B29B9/00; B29B9/02; B29B9/06; B29B9/065; B30; B30B; B30B11/00; B30B11/22; B30B11/227; Y; Y10; Y10T; Y10T83/00; Y10T83/04; Y10T83/0591; Y10T83/364
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
82 words
A METHOD OF CUTTING EXTRUSIONS AT THE FACE OF AN EXTRUDER DIE COMPRISING EXTRUDING A MATERIAL THROUGH SAID DIE TO FORM MULTIPLE CONTINUOUS EXTRUSIONS AND DIRECTING A SHAPED STREAM OF HIGH PRESSURE GAS FROM THE CENTER REGION OF SAID DIE FACE OUTWARDLY TOWARD THE PERIPHERY OF SAID DIE FACE WHEREBY A SURFACE OF THE EXTTRUSIONS IN A PERPENDICULAR RELATIONSHIP TO THE FACE OF SAID DIE IS CONTACTED BY SAID SHAPED GAS STREAM AND SAID MULTIPLE EXTRUSIONS ARE SEVERED AT ESSENTIALLY CONSTANT LENGTHS.
Claim 2
Independent Claim
82 words
A METHOD OF CUTTING EXTRUSIONS AT THE FACE OF AN EXTRUDER DIE COMPRISING EXTRUDING A MATERIAL THROUGH SAID DIE TO FORM MULTIPLE CONTINUOUS EXTRUSIONS AND DIRECTING A SHAPED STREAM OF HIGH PRESSURE GAS FROM THE CENTER REGION OF SAID DIE FACE OUTWARDLY TOWARD THE PERIPHERY OF SAID DIE FACE WHEREBY A SURFACE OF THE EXTTRUSIONS IN A PERPENDICULAR RELATIONSHIP TO THE FACE OF SAID DIE IS CONTACTED BY SAID SHAPED GAS STREAM AND SAID MULTIPLE EXTRUSIONS ARE SEVERED AT ESSENTIALLY CONSTANT LENGTHS.
Claim 3
Dependent Claim
26 words
A method as in claim 1 wherein the cutting length of said extrusions may be varied by varying the shape of said high pressure gas stream.
Claim 4
Dependent Claim
33 words
A method as in claim 2 wherein the shape of said high pressure gas stream is varied by varying the spatial relationship of a nozzle, a deflector, and the face of said die.
Claim 5
Dependent Claim
23 words
A method as in claim 1 wherein said high pressure gas is air at a pressure of about 25 psi to 300 psi.
Claim 6
Dependent Claim
48 words
A method as in claim 1 wherein there is at least one secondary high pressure gas stream, said secondary high pressure gas stream emanating from the periphery of said die and directed against a surface of the extrusions in a perpendicular relationship to the face of said die.
Claim 7
Dependent Claim
21 words
A method as in claim 5 wherein said secondary high pressure gas stream emanates from the entire periphery of said die.
Claim 8
Dependent Claim
22 words
A method as in claim 5 wherein said secondary high pressure gas stream is air at about 25 psi to 300 psi.
Claim 9
Dependent Claim
29 words
A method as in claim 1 wherein said extrusions are comprised of materials selected from the group consisting of silicas, aluminas, aluminosilicates, zeolites, titanias, zirconias, magnesias and mixtures thereof.
Claim 10
Dependent Claim
13 words
A method as in claim 8 wherein said extrusion is an alumina extrusion.
Claim 11
Dependent Claim
13 words
A method as in claim 8 wherein said extrusion is a silica extrusion.
Claim 12
Dependent Claim
13 words
A method as in claim 8 wherein said extrusion is a zeolite extrusion.
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) | 1977-11-04 | 1978-05-06 | 1978-11-05 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-11-04 | 1982-05-06 | 1982-11-05 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-11-04 | 1986-05-06 | 1986-11-05 | $7700.00 | Window Closed / Lapsed |