WO1995002797B1 - Pellet extruding machine - Google Patents
Pellet extruding machineInfo
- Publication number
- WO1995002797B1 WO1995002797B1 PCT/US1994/007856 US9407856W WO9502797B1 WO 1995002797 B1 WO1995002797 B1 WO 1995002797B1 US 9407856 W US9407856 W US 9407856W WO 9502797 B1 WO9502797 B1 WO 9502797B1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- chamber
- dry ice
- snow
- recited
- cartridge
- Prior art date
Links
- 239000008188 pellet Substances 0.000 title claims abstract 75
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract 112
- CURLTUGMZLYLDI-UHFFFAOYSA-N carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract 82
- 235000011089 carbon dioxide Nutrition 0.000 claims abstract 82
- 239000007787 solid Substances 0.000 claims abstract 65
- 239000002245 particle Substances 0.000 claims abstract 45
- 239000007788 liquid Substances 0.000 claims abstract 16
- 238000001125 extrusion Methods 0.000 claims abstract 14
- 238000005056 compaction Methods 0.000 claims abstract 13
- 230000015572 biosynthetic process Effects 0.000 claims abstract 9
- 238000005755 formation reaction Methods 0.000 claims abstract 9
- 230000002457 bidirectional Effects 0.000 claims abstract 2
- 230000008929 regeneration Effects 0.000 claims abstract 2
- 238000011069 regeneration method Methods 0.000 claims abstract 2
- 210000000088 Lip Anatomy 0.000 claims 6
- 238000002347 injection Methods 0.000 claims 5
- 239000007924 injection Substances 0.000 claims 5
- 239000000463 material Substances 0.000 claims 5
- 239000002184 metal Substances 0.000 claims 4
- 238000011144 upstream manufacturing Methods 0.000 claims 3
- 230000001154 acute Effects 0.000 claims 2
- 239000002923 metal particle Substances 0.000 claims 2
- 239000011148 porous material Substances 0.000 claims 2
- 239000000126 substance Substances 0.000 claims 2
- 229920002892 amber Polymers 0.000 claims 1
- 239000001569 carbon dioxide Substances 0.000 claims 1
- 238000002485 combustion reaction Methods 0.000 claims 1
- 230000003247 decreasing Effects 0.000 claims 1
- 235000013305 food Nutrition 0.000 claims 1
- 239000011236 particulate material Substances 0.000 claims 1
- 239000003208 petroleum Substances 0.000 claims 1
- 238000005488 sandblasting Methods 0.000 claims 1
- 238000004519 manufacturing process Methods 0.000 abstract 2
- 239000007795 chemical reaction product Substances 0.000 abstract 1
Abstract
An extruder (80) for converting pressurized liquid CO2 feed into dry ice pellets of predetermined shape and size, wherein the CO2 snow formation, CO2 snow compaction and dry ice pellet extrusion phases occur simultaneously to achieve production rates on the order of 700-1000 lbs/hr. The compacted CO2 snow may be in the form of a solid cartridge or irregularly shaped solids, and such compacted particles may constitute an end product by themselves. The increased production rates are also achieved by enhanced removal of CO2 gas from the CO2 snow formation chamber (86) through a filter cartridge (170), and use of bidirectional internal regeneration cylinders (126 and 136) to provide compactive force. The extruder is portable, since it only weighs approximately 1000 lbs, can be powered with a non-stationary energy source, and may be used to remanufacture partially sublimated dry ice solids into extruded dry ice pellets of a predetermined shape and size.
Claims
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AMENDED CLAIMS
[received by the International Bureau on 18 January 1995 (18.01.95); original claims 1-64 replaced by amended claims 1-64 (16 pages)]
1. A dry ice pellet extruder as recited in claim 64, wherein said filter medium of said C02 snow formation chamber wall extends across at least 25% of the parameter of said wall.
2. A dry ice pellet extruder as recited in claim 64, wherein said sintered filter material is made from plastic or metal particles.
3. A dry ice pellet extruder as recited in claim 64, further comprising a perforated metal jacket for supporting said filter medium with a plurality of holes therein for permitting passage of C02 gas therethrough.
4. A dry ice pellet extruder as recited in claim 3, wherein the holes of said perforated metal jacket are about 10 μm to 250 μm in diameter.
5. A dry ice pellet extruder as recited in claim 64, further comprising a vent housing surrounding said first chamber for collecting C02 gas vented from said chamber through said filter medium, the collected C02 gas being exhausted to the atmosphere through an exhaust vent in said housing.
6. A dry ice pellet extruder as recited in claim 64, wherein said extrusion means comprises a housing having an inlet port for collecting the solid C02 snow cartridge or other irregularly shaped solids in an extrusion chamber from said C02 snow compaction chamber, said extrusion chamber having a die plate attached to its downstream end and a reciprocating
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piston head contained within said extrusion chamber upstream of the cartridge or irregularly shaped solids for pressing the cartridge or irregularly shaped solids against said die plate to extrude the dry ice pellets.
7. A dry ice pellet extruder as recited in claim 64, wherein said movable element for compacting the C02 snow particles comprises a reciprocating piston head inside said first chamber for compressing the C02 snow particles against said solid surface to form the solid C02 snow cartridge or irregularly shaped solid form.
8. A dry ice pellet extruder as recited in claim 7, wherein a reciprocated force of at least 1200 psig pressure is imparted to said compaction piston head.
9. A dry ice pellet extruder as recited in claim 7, wherein said solid compaction surface comprises a reciprocating gate barrier downstream of the outlet oort of said C02 snow formation chamber, said gate oarrier being operated by means yielding reciprocated linear r vement.
10. A dry ice pellet extruder as recited in claim 9, wherein said means for yielding reciprocated linear movement comprises a gas-actuated piston.
11. A dry ice pellet extruder as recited in claim 7, wherein said solid compaction surface comprises the interior wall of said second chamber.
12. A dry ice pellet extruder as recited in claim 9, further comprising a tapered zone upstream of said reciprocating gate barrier, said zone having an inlet
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reciprocating gate barrier, said zone having an inlet area greater than that of its outlet area, whereby the volume of the C02 snow particles is reduced as they are compacted against said gate barrier to form the C02 snow cartridge.
13. A dry ice pellet extruder as recited in claim 9, further comprising a die plate immediately downstream of said reciprocating gate barrier, said die plate having a single passage therethrough with a beveled lip along the perimeter of the outlet face of said passage, whereby once said gate barrier is moved to the open position, and said reciprocating piston head pushes the C02 snow cartridge through said die plate passage, said beveled lip fractures the C02 snow cartridge into a plurality of irregularly shaped solids.
14. A dry ice pellet extruder as recited in claim 6, wherein a reciprocated force of at least 3200 psig pressure is imparted to said extrusion piston head.
15. A dry ice pellet extruder as recited in claim 6, wherein said reciprocating piston head is connected to a shaft operated by means yielding reciprocated linear movement.
16. A dry ice pellet extruder as recited in claim 15, wherein said means for yielding reciprocated linear movement comprises a hydraulic cylinder.
17. A dry ice pellet extruder as recited in claim 16, wherein said hydraulic cylinder comprises a bidirectional internal regeneration hydraulic cylinder.
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18. A dry ice pellet extruder as recited in claim 16, wherein said hydraulic cylinder is close coupled to said first chamber or said second chamber without any intervening web plate or tie rods for preventing misalignment of said hydraulic cylinder and said extrusion chamber or compaction chamber.
19. A dry ice pellet extruder as recited in claim 16, wherein said hydraulic cylinder is operated by an internal combustion engine.
20. A dry ice pellet extruder as recited in claim 6, wherein said die plate has a plurality of channels of predetermined size drilled through the width thereof for forming the dry ice pellets having a size substantially similar to the size of said extrusion channels.
21. A dry ice pellet extruder as recited in claim
20. wherein said channels drilled through said die plate have a generally constant diameter from the inlet end to the outlet end.
22. A dry ice pellet extruder as recited in claim 20, wherein the aggregate cross-sectional area of said channels of said die plate cover at least a majority of the surface area of said die plate.
23. A dry ice pellet extruder as recited in claim 22, wherein the aggregate cross-sectional area of said channels of said die plate cover about 65-70% of the surface of said die plate.
24. A dry ice pellet extruder as recited in claim 20, wherein the diameter of the cross-sectional area of said die plate channels fall within the range of about 0.04-1.0 inches.
25. A dry ice pellet extruder as recited in claim 20, wherein the width of said die plate does not exceed about 1 inch.
26. A dry ice pellet extruder as recited in claim 6, further comprising a taper plate positioned between said second chamber and said die plate, said taper plate having an inlet opening and an outlet opening, the diameter of said outlet opening being less than that of said inlet opening to produce a tapered wall region therebetween, said tapered wall region further increasing the density of the C02 snow cartridge or irregularly shaped particles pressed by said piston head through said taper plate to said die plate.
27. A dry ice pellet extruder as recited in claim 26, wherein the volume of said C02 snow cartridge or irregularly shaped particles pushed through the outlet opening is at least 75% less than the volume of the mass of C02 snow particles originally compacted to form said compacted cartridge or irregularly shaped particles.
28. A dry ice pellet extruder as recited in claim 6, wherein the direction of movement of said piston head inside said first chamber is parallel to the direction of movement of said piston head inside said second chamber.
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29. A dry ice pellet extruder as recited in claim 6, wherein the direction of movement of said piston head inside said first chamber forms an acute angle with the direction of movement of said piston head inside said second chamber.
30. A dry ice pellet extruder as recited in claim 29, wherein said acute angle falls within the range of about 35° to about 55°.
31. A dry ice pellet extruder as recited in claim 29, wherein said compaction piston head inside said first chamber mechanically forces the C02 snow cartridge through the outlet opening of said first chamber and the inlet, opening of said second chamber into a position downstream of said reciprocating extrusion piston head.
32. A dry ice pellet extruder as recited in claim 31, wherein the cross-sectional area of the outlet opening of said first chamber is substantially greater than the cross-sectional area of the inlet opening of said second chamber to form a taper lip therebetween, the volume of the C0 snow particles being pushed through said taper lip by said compaction piston head being decreased by at least about 75%.
33. A dry ice pellet extruder as recited in claim 32, wherein the outlet opening of said first chamber is square, and the inlet opening of said second chamber is circular.
34. A dry ice pellet extruder as recited in claim 33, wherein the length of a side of said square first
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chamber outlet opening is at least about 3 1/2 inches, and the diameter of said round second chamber inlet opening is less than about 3 inches.
35. A dry ice pellet extruder as recited in claim 7, wherein said first chamber, includes three subchambers which are reciprocated between three separate chamber positions, whereby C02 snow formation, C02 snow compaction, and C02 snow cartridge or irregularly shaped solids ejection functions may occur simultaneously.
36. A dry ice pellet extruder as recited in claim 35, wherein said three subchambers have at least a portion of the wall thereof formed by a filter medium for selectively separating C02 gas from C02 snow particles when one of said subchambers is positioned against a stationary station for injecting liquid C02 into said chamber to form the C02 snow particles and C02 gas.
37. A dry ice pellet extruder as recited in claim 35, wherein one of said subchambers is positioned against a stationary station having a reciprocating piston head projected therefrom into said subchambers by a hydraulic cylinder for compacting the C02 snow particles contained therein to form the C02 snow cartridge or irregularly shaped solids.
38. A dry ice pellet extruder as recited in claim 35, wherein one of said subchambers is positioned against a stationary station having a reciprocating piston head projecting therefrom into said subchambers by a hydraulic cylinder for ejecting the C02 snow
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cartridge or irregularly shaped solids contained inside said chamber into said extrusion chamber.
39. A dry ice pellet extruder as recited in claim 35, wherein said three subchambers are mounted to a carousel rotated by a mechanized drive shaft so that each of said subchambers is sequentially reciprocated between said stationary liquid C02 injection, C02 snow compaction, and C02 snow cartridge or irregularly shaped solids ejection stations.
40. A dry ice pellet extruder as recited in claim 64, further comprising means for feeding partially sublimated dry ice pellets to said extrusion means, whereby said partially sublimated dry ice pellets are extruded once again to form dry ice pellets of a predetermined shape and size.
41. A dry ice pellet extruder as recited in claim
40, wherein said reextruded dry ice pellets are of a different shape or size than that of the original dry ice pellets that partially sublimated.
42. An apparatus for producing solid C02 cartridges or irregularly shaped solids from an injected pressurized liquid C02 feed, comprising:
(a) a first chamber maintained at a pressure lower than said liquid C02 injection pressure in which the liquid C02 is transfor-ed into C02 snow particles and C02 gas, said chamber having an outlet port for the removal of the C02 snow particles;
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(b) at least a portion of the wall of said C02 first chamber comprising a filter medium having pores of predetermined size and distribution for selectively separating the C02 snow particles from the C02 gas so that the C02 gas may be vented to the atmosphere, while containing the C02 snow particles inside said C02 snow formation chamber; and (c) means for compacting the C02 snow particles into a solid cartridge or other irregularly shaped solids having increased density;
(d) a second chamber having means for extruding said solid cartridge or an irregularly shaped solid form into dry ice pellets; and
(e) means communicating between said first and second chambers for passage of said solid cartridge or an irregularly shaped solid from said first chamber to said second chamber, wherein a first cartridge or an irregularly shaped solid form is formed in said first chamber, passes to said second chamber, and is extruded from said second chamber while a second cartridge or other irregularly shaped solid form is being formed in said first chamber.
43. A dry ice pellet extruder as recited in claim 42, wherein said filter medium of said C02 snow formation chamber wall extends across at least 25% of the perimeter of said wall.
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44. A dry ice pellet extruder as recited in claim 42, wherein said filter medium comprises a sintered particle material having a plurality of tortuous and irregularly shaped air passages across the width
5 thereof and between the particles therein for venting the C02 gas.
45. A dry ice pellet extruder as recited in claim 44, wherein said sintered filter material is made from plastic or metal particles.
0 46. A dry ice pellet extruder as recited in claim 42, further comprising a perforated metal jacket for supporting said filter medium with a plurality of holes therein for permitting passage of C02 gas therethrough.
47. A dry ice pellet extruder as recited in claim 5 46, wherein the holes of said perforated metal jacket are about 10 μm to 250 μm in diameter.
48. A dry ice pellet extruder as recited in claim 42, wherein said means for compacting the C02 snow particles comprises a reciprocating piston head inside 0 said C02 snow formation chamber for compressing the C02 snow particles against a solid surface to form the solid C02 snow cartridge.
49. A dry ice pellet extruder as recited in claim 48, wherein a reciprocated force of at least 1200 psig
, 5 pressure is imparted to said compaction piston head.
50. An apparatus for producing solid C02 cartridges or irregularly shaped solids from an injected pressured liquid C02 feed, comprising:
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(a) a chamber maintained at a pressure lower than said liquid C02 injection pressure into which the liquid C02 is transformed into C02 snow particles and C02 gas, said chamber having an outlet port for the removal of the C02 snow particles;
(b) Means for compressing the C02 snow particles against a solid surface to from the solid C02 snow cartridge; (c) a die plate positioned immediately downstream of said solid surface, said die plate having a single passage therethrough with a beveled lip along the perimeter of the outlet face of said passage, whereby once said C02 snow cartridge is pushed through said die plate passage, said beveled lip fractures the C02 snow cartridge into a plurality of irregularly shaped solids.
51. A dry ice pellet extruder as recited in claim
50, wherein said solid compaction surface comprises a reciprocating gate barrier downstream of the outlet port of said C0 snow formation chamber, said gate barrier being operated by means yielding reciprocated linear movement.
52. A dry ice pellet extruder as recited in claim
51, further comprising a tapered zone upstream of said reciprocating gate barrier, said zone having an inlet area greater than that of its outlet area, whereby the volume of the C02 snow particles is reduced as they are compacted against said gate barrier to form the C02 snow cartridge.
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53. A dry ice pellet extruder as recited in claim 64, wherein said dry ice pellets are fed to an associated hose and and nozzle assembly similar to a sand blasting machine.
54. A dry ice pellet extruder as recited in claim 64, wherein said dry ice pellets are used to refrigerate or quick freeze food products.
55. A dry ice pellet extruder as recited in claim 64, wherein said dry ice pellets are used to cool unlubricated equipment parts.
56. A dry ice : ^llet extruder as recited in claim 64, wherein said dry ice pellets are used to freeze chemical spills or leaks for subsequent clean up.
57. A dry ice pellet extruder as recited in claim 64, wherein said dry ice pellets are used to extinguish chemical or petroleum-based fires.
58. A dry ice pellet extruder as recited in claim 64, wherein said filter medium can withstand a pressure of at least about 150 psig.
59. A method for produ ig dry ice pellets from an injected pressurized lx._-id C02 feed comprising the steps of:
(a) maintaining a first chamber at a pressure lower than that of the injected pressurized liquid C02 feed and converting said liquid C02 into 2 snow particles and C02 gas in said chamber;
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(b) selectively separating the C02 snow particles from the C02 gas formed in said first chamber by venting said C02 gas to the atmosphere through a filter medium formed in a wall of said first chamber while containing the C02 snow particles inside first chamber, said filter medium comprising a sintered particle material having a plurality of tortuous and irregularly shaped air passages formed therein between the sintered particles; and
(c) compacting the C02 snow particles in said first chamber into a first solid cartridge or irregularly shaped solid form having increased density.
60. The method of claim 59 further including the step of extruding said first solid cartridge or irregularly shaped solid form.
61. The method of claim 60 wherein a second solid cartridge or irregularly shaped solid form is formed in said first chamber essentially simultaneously with the extrusion of said first solid cartridge or other irregularly shaped solid form.
62. The method of claim 61 wherein the extrusion of said first solid cartridge or other irregularly shaped solid form is performed in a second chamber different from said first chamber in which second solid cartridge or irregularly shaped solid form is being formed.
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63. An apparatus for converting liquid C02 into C02 snow particles and C02 gas and for separating the C02 snow particles from the C02 gas, said apparatus comprising:
(a) a housing including a chamber enclosed by walls, said chamber being maintained at a pressure such that liquid C02 injected therein will be converted into C02 gas and C02 snow particles; and
(b) at least a portion of the wall of said chamber comprising a filter medium having pores of predetermined size and distribution for selectively separating the C02 snow particles from the C02 gas so that the C02 gas may be vented to the atmosphere while containing the C02 snow particles inside said chamber, the filter medium comprising a sintered particle material having a plurality of tortuous and irregularly shaped air passages formed therein between the sintered particles for separating the C02 snow particles from the C02 gas.
64. An apparatus for producing dry ice pellets from an injected pressurized liquid carbon dioxide (C02) feed, comprising:
(a) a housing having a first chamber and a second chamber;
(b) means for injecting a liquid C02 feed into the first chamber at an injection pressure, said first chamber being
1
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maintained at a pressure lower than said injection pressure so that injected liquid C02 is transformed into snow particles and C02 gas in said first 5 chamber;
(c) said first chamber including a wall formed with a filter medium therein, the filter medium comprising a sintered particulate material having a plurality
10 of tortuous and irregularly shaped air passages formed therein for separating C02 snow particles from C02 gas and selectively exhausting C02 gas to the atmosphere while containing C02 snow
15 particles inside said first chamber;
(d) said first chamber including a moveable element structured and dimensioned for compacting C02 snow particles against a solid surface in said housing to form
20 said particles into a solid C02 snow cartridge or an irregularly shaped solid form of increased density and said first chamber having an outlet port for removal of said solid C02 snow cartridge
25 or irregularly shaped solid form;
(e) means for transporting a solid C02 snow cartridge or irregularly shaped solid form from said first chamber to said second chamber;
30 (f) said second chamber including means for extruding a solid C02 snow cartridge or an irregularly shaped solid form transported from said first chamber into
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dry ice pellets of predetermined shape and size; and (g) said means for compacting C02 snow particles into a solid cartridge or 5 irregularly shaped solid form and said means for extruding a solid C0 snow cartridge or an irregularly shaped solid form operating in tandem in a manner such that said extrusion of a first
10 solid C02 snow cartridge or irregularly shaped solid in said second chamber and compaction of a second solid C02 snow cartridge or irregularly shaped solid form in said first - amber occurs
15 simultaneously.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU74722/94A AU7472294A (en) | 1993-07-13 | 1994-07-13 | Pellet extruding machine |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US091,143 | 1993-07-13 | ||
| US08/091,143 US5419138A (en) | 1993-07-13 | 1993-07-13 | Pellet extruding machine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| WO1995002797A1 WO1995002797A1 (en) | 1995-01-26 |
| WO1995002797B1 true WO1995002797B1 (en) | 1995-03-16 |
Family
ID=22226291
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/US1994/007856 WO1995002797A1 (en) | 1993-07-13 | 1994-07-13 | Pellet extruding machine |
Country Status (4)
| Country | Link |
|---|---|
| US (2) | US5419138A (en) |
| AU (1) | AU7472294A (en) |
| IL (1) | IL110310A0 (en) |
| WO (1) | WO1995002797A1 (en) |
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| CN110156017A (en) * | 2019-04-26 | 2019-08-23 | 大连伊立特科技有限公司 | It produces dry ice and crystallizes cylinder barrel with piston type |
| RU2741594C1 (en) * | 2020-04-24 | 2021-01-27 | Общество с ограниченной ответственностью "Ирбис Технологии" | Device, method and system for production of granular carbon dioxide |
| TWI810927B (en) * | 2021-05-07 | 2023-08-01 | 美商冷卻噴射公司 | Method and apparatus for forming solid carbon dioxide |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE484570C (en) * | 1927-07-27 | 1929-10-17 | Waldemar Hessling | Method and machine for compressing solid carbon dioxide |
| US2127300A (en) * | 1934-03-23 | 1938-08-16 | Esslingen Maschf | Method for making dry ice blocks |
| US2253880A (en) * | 1940-04-27 | 1941-08-26 | York Ice Machinery Corp | Apparatus for producing carbon dioxide snow blocks |
| US3077081A (en) * | 1959-10-05 | 1963-02-12 | Agefko Kohlensaeure Werke G M | Method for producing shaped bodies of high-density carbon dioxide |
| US3618330A (en) * | 1968-09-12 | 1971-11-09 | Chemetron Corp | Solidified gas filter |
| US3576112A (en) * | 1968-11-29 | 1971-04-27 | Chemetron Corp | Filtering gas from pelletized co{hd 2 {l snow |
| US3708993A (en) * | 1969-11-12 | 1973-01-09 | Chemetron Corp | Solidified gas pellets and apparatus for manufacturing |
| USRE30632E (en) * | 1971-02-25 | 1981-06-02 | Rhone Poulenc, S.A. | Separation apparatus |
| US3762566A (en) * | 1971-08-03 | 1973-10-02 | Abcor Inc | Supported semipermeable membranes and process for preparing same |
| BE788610A (en) * | 1971-09-09 | 1973-03-08 | Rhone Poulenc Sa | MEMBRANE SEPARATOR APPARATUS USED IN GAS PERMEATION AND PERVAPORATION |
| US3835657A (en) * | 1971-10-26 | 1974-09-17 | Chemetron Corp | Carbon dioxide extruded pellets |
| US4227527A (en) * | 1978-10-23 | 1980-10-14 | Baxter Travenol Laboratories, Inc. | Sterile air vent |
| US4412852A (en) * | 1981-12-14 | 1983-11-01 | Naotake Umino | Apparatus for producing brick-shaped blocks of dry ice |
| US4457487A (en) * | 1982-06-23 | 1984-07-03 | The Kendall Company | Flushing device |
| US4727687A (en) * | 1984-12-14 | 1988-03-01 | Cryoblast, Inc. | Extrusion arrangement for a cryogenic cleaning apparatus |
| US4780119A (en) * | 1987-10-02 | 1988-10-25 | Tomco2 Equipment Company | Method and apparatus for producing carbon dioxide units |
| FR2654717A1 (en) * | 1989-11-23 | 1991-05-24 | Air Liquide | Process and device for the manufacture of cylinders of solid CO2 of accurate weight |
| US5301509A (en) * | 1992-07-08 | 1994-04-12 | Cold Jet, Inc. | Method and apparatus for producing carbon dioxide pellets |
| US5419138A (en) * | 1993-07-13 | 1995-05-30 | Laroche Industries, Inc. | Pellet extruding machine |
-
1993
- 1993-07-13 US US08/091,143 patent/US5419138A/en not_active Expired - Fee Related
-
1994
- 1994-07-13 AU AU74722/94A patent/AU7472294A/en not_active Abandoned
- 1994-07-13 WO PCT/US1994/007856 patent/WO1995002797A1/en active Application Filing
- 1994-07-13 IL IL11031094A patent/IL110310A0/en unknown
- 1994-11-29 US US08/346,491 patent/US5548960A/en not_active Expired - Fee Related
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