Patent US3786645A successfully refreshed from Google Patents.
US3786645A
Expired / Lapsed
US
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Apparatus for making compacted pellets of solid phase carbon dioxide
Assignee: Cardox Corp
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Filing: 1972-08-28
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Granted: 1974-01-22
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Expires: 1992-08-28
Abstract
Abstract Apparatus for making compacted pellets of solid phase carbon dioxide comprises die means having radial extrusion passages therein, injector means for forming snow from liquid carbon dioxide flashed into an expansion zone adjacent the inlet end of said extrusion passages, compression means for compacting said snow and extruding the same outwardly through said passages to form elongated, rod-like extrusions of solid phase carbon dioxide, and back pressure means for exerting contact pressure against said extrusions leaving the outer ends of said passages in said die means. A novel method in accordance with the present invention comprises the formation of compacted pellets of solid phase carbon dioxide from liquid phase carbon dioxide to form snow, compressing said snow to force the same through an extrusion passageway forming elongated, rod-like extrusions of compacted solid phase carbon dioxide and exerting back pressure against the rod-like extrusion as they leave the passageways thereby stabilizing the extrusions permitting the escape of gas without fracturing the same.
Inventors
- 👤 L Cann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 15:02
CPC Classifications
B; B30; B30B; B30B11/00; B30B11/20; B30B11/201; B30B11/202
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
46 words
The apparatus of claim 1 wherein said last mentioned means comprises a deflectable spring normally closing the outer end of said extrusion passage, said spring being deflectable by said rod-like extrusions of solid phase carbon dioxide moving outwardly of the outer end of said extrusion passage.
Claim 2
Dependent Claim
44 words
The apparatus of claim 2 wherein said spring comprises a strip of material having a deflectable free end positioned to extend across said outer end of said extrusion passage and means for supporting said strip from said die means away from said free end.
Claim 3
Dependent Claim
83 words
The apparatus of claim 3 wherein said die means includes at least one pair of adjacent, spaced apart, extrusion passages, said spring strip comprising a generally U-shaped member having opposite free ends extending across the outer ends of said passages and deflectable inwardly toward one another by said rod-like extrusions as they are extruded out through said passages, said means for supporting said strip comprising pin means between said outer ends of said passages engaging a middle bight portion of said U-shaped member.
Claim 4
Dependent Claim
60 words
The apparatus of claim 2 wherein said die means comprises an annular wall having a plurality of radially extending extrusion passages therein, said compression means comprising an impeller mounted for orbital movement around the interior of said annular wall for compacting said snow and extruding it out through said radial extrusion passages against the back pressure of said deflectable spring.
Claim 5
Dependent Claim
48 words
The apparatus of claim 5 wherein said injector means comprises a plurality of spray nozzles positioned at spaced apart locations around the interior of said annular wall for flashing liquid carbon dioxide into snow in an area between said impeller and the inner ends of said extrusion passages.
Claim 6
Dependent Claim
50 words
The apparatus of claim 6 including valve means operative in response to the relative eccentric position of said impeller and said annular wall of said die means for closing off the flow of liquid carbon dioxide to one of said spray nozzles while opening the flow to another spray nozzle.
Claim 7
Dependent Claim
67 words
The apparatus of claim 6 wherein said annular wall of said die means is formed with an annular groove in communication with the inner ends of said extrusion passages for receiving a portion of the periphery of said impeller, said portion of said impeller received within said groove and the wall surfaces of said groove defining a compression zone movable around said die as said impeller orbits.
Claim 8
Dependent Claim
41 words
The apparatus of claim 8 including valve means operative to control the flow of liquid carbon dioxide to said spray nozzles for supplying nozzles positioned ahead of said compression zone and for shutting off the supply to nozzles in said zone.
Claim 9
Dependent Claim
127 words
Apparatus for making compacted pellets of solid phase carbon dioxide comprising an extrusion chamber having an outer wall formed by annular die means having a plurality of extrusion passages extending outwardly of a central axis between inside and outside surfaces thereof; impeller means mounted in said chamber for orbital movement around said axis to form a moving compression zone adjacent a segment of said annular die means for extrusion of carbon dioxide through said passages and an open zone ahead of said compression zone in the path thereof; and injection means for flashing liquid carbon dioxide into said open zone forming snow to be compressed and extruded into rod-like extrusions of solid phase carbon dioxide by said impeller moving around said die means in said extrusion zone.
Claim 10
Dependent Claim
70 words
The apparatus of claim 10 wherein said injection means comprises a plurality of spray nozzles positioned at radially spaced apart locations around the inside surface of said annular die wall and valve means responsive to the position of said compression zone in said annular die wall for supplying liquid carbon dioxide to said nozzles in said open zone and shutting of the supply to a nozzle adjacent said compression zone.
Claim 11
Dependent Claim
48 words
The apparatus of claim 11 wherein said annular die wall is formed with a groove around the inside surface thereof in communication with the inside ends of said extrusion passages, said groove having opposed parallel circular side surfaces engaging opposite sides of said impeller in said compression zone.
Claim 12
Dependent Claim
45 words
The apparatus of claim 12 wherein said spray nozzles are spaced inwardly of said side surfaces of said groove in said die wall toward said axis for directing a spray between an outer periphery of said impeller and said inside surface of said die wall.
Claim 13
Dependent Claim
67 words
The apparatus of claim 13 including a vapor exhaust means for removing carbon dioxide vapor from said chamber, said exhaust means comprising an annular exhaust channel around at least one side of said extrusion chamber inwardly of said side surfaces of said groove in said die wall and an annular filter between said extrusion chamber and said exhaust channel for passing gases and containing solid carbon dioxide.
Claim 14
Dependent Claim
48 words
The apparatus of claim 14 wherein said vapor exhaust means includes a pair of said annular exhaust channels on opposite sides of said extrusion chamber and a pair of said annular filters, and a plurality of exhaust passages in said die wall for interconnecting said annular exhaust channels.
Claim 15
Dependent Claim
23 words
The apparatus of claim 15 wherein said exhaust passages are normal to and radially spaced between adjacent extrusion passages in said die wall.
Claim 16
Dependent Claim
35 words
The apparatus of claim 15 including spray nozzles in said extrusion chamber for flashing sprays of liquid carbon dioxide into snow between the periphery of said impeller and said annular groove in said die wall.
Claim 17
Dependent Claim
43 words
The apparatus of claim 11 wherein said valve means includes a plurality of supply passages for supplying liquid carbon dioxide to said spray nozzles and a rotor movable to alternately open and close said supply passages driven in synchronism with said orbiting impeller.
Claim 18
Dependent Claim
17 words
The apparatus of claim 18 including eccentric drive means drivingly interconnecting said impeller and said valve rotor.
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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) | 1977-01-21 | 1977-07-23 | 1978-01-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-01-21 | 1981-07-23 | 1982-01-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-01-21 | 1985-07-23 | 1986-01-22 | $7700.00 | Window Closed / Lapsed |