Patent US3814566A successfully refreshed from Google Patents.
US3814566A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for continuously converting mesophase pitch into a highly oriented structure
Assignee: Graftech Technology LLC
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Filing: 1972-10-31
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Granted: 1974-06-04
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Expires: 1992-10-31
Abstract
Abstract An apparatus for continuously converting hydrocarbonaceous material, such as mesophase pitch, into an oriented structure, comprising an auger extruder coupled to a converging - straight diverging forming die. The die has disposed around it a floating heating coil which is axially movable in response to the pressure-sensed at the discharge exit of the extruder.
Inventors
- 👤 R Stroup
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 16:55
CPC Classifications
B; B29; B29C; B29C48/00; B29C48/022; B29C48/03; B29C48/131; B29K; B29K2105/00; B29K2105/06; B29K2105/12
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
189 words
An apparatus for continuously converting hydrocarbonaceous pitch to highly structurally oriented coke comprising an auger extruder having an input feed opening, an output discharge opening, and an extruder screw extending substantially the length of the extruder, said extruder screw comprising a continuous helical rib projection from a shank; means for rotating Said extruder screw; a first heating means substantially positioned around and axial along the extruder; a forming die coupled to the discharge opening of the extruder and possessing three sections defined by the walls of the die which comprises a converging first section, followed by a substantially constant crosssectional second section and a final diverging third section; a second heating means positioned at least substantially around a portion of said second section and axially movable along at least the second section of the forming die; pressure detection means positioned in and at the vicinity of the discharge opening; and transducer means coupled to the pressure detecting means and to the movable second heating means so that the axial movement of said second heating means can be regulated by the pressure at the vicinity of the output discharge opening.
Claim 2
Independent Claim
189 words
An apparatus for continuously converting hydrocarbonaceous pitch to highly structurally oriented coke comprising an auger extruder having an input feed opening, an output discharge opening, and an extruder screw extending substantially the length of the extruder, said extruder screw comprising a continuous helical rib projection from a shank; means for rotating Said extruder screw; a first heating means substantially positioned around and axial along the extruder; a forming die coupled to the discharge opening of the extruder and possessing three sections defined by the walls of the die which comprises a converging first section, followed by a substantially constant crosssectional second section and a final diverging third section; a second heating means positioned at least substantially around a portion of said second section and axially movable along at least the second section of the forming die; pressure detection means positioned in and at the vicinity of the discharge opening; and transducer means coupled to the pressure detecting means and to the movable second heating means so that the axial movement of said second heating means can be regulated by the pressure at the vicinity of the output discharge opening.
Claim 3
Dependent Claim
16 words
The apparatus of claim 1 wherein said second heating means comprises at least one induction coil.
Claim 4
Dependent Claim
19 words
The apparatus of claim 2 wherein a mandrel is positioned axially within a substantial portion of the forming die.
Claim 5
Dependent Claim
39 words
The apparatus of claim 1 wherein the shank of the extruder screw is reverse tapered such that the diameter of the shank at the input opening is smaller than the diameter of the shank at the output discharge opening.
Claim 6
Dependent Claim
16 words
The apparatus of claim 4 wherein said second heating means comprises at least one induction coil.
Claim 7
Dependent Claim
19 words
The apparatus of claim 5 wherein a mandrel is positioned axially within a substantial portion of the forming die.
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) | 1977-06-03 | 1977-12-03 | 1978-06-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-06-03 | 1981-12-03 | 1982-06-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-06-03 | 1985-12-03 | 1986-06-04 | $7700.00 | Window Closed / Lapsed |