US20020005040A1 - Method of and system for heat recovery for an internal combustion engine - Google Patents
Method of and system for heat recovery for an internal combustion engine Download PDFInfo
- Publication number
- US20020005040A1 US20020005040A1 US09/865,711 US86571101A US2002005040A1 US 20020005040 A1 US20020005040 A1 US 20020005040A1 US 86571101 A US86571101 A US 86571101A US 2002005040 A1 US2002005040 A1 US 2002005040A1
- Authority
- US
- United States
- Prior art keywords
- fluid
- supplying
- heat
- internal combustion
- combustion engine
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
Links
- 238000002485 combustion reaction Methods 0.000 title claims abstract description 30
- 238000011084 recovery Methods 0.000 title claims abstract description 12
- 238000000034 method Methods 0.000 title claims description 24
- 239000012530 fluid Substances 0.000 claims abstract description 59
- 230000003197 catalytic effect Effects 0.000 claims description 7
- 239000002826 coolant Substances 0.000 claims description 7
- 239000000314 lubricant Substances 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 4
- 239000003517 fume Substances 0.000 claims description 3
- 239000000463 material Substances 0.000 claims 3
- 239000007789 gas Substances 0.000 description 7
- 239000000470 constituent Substances 0.000 description 4
- 239000000446 fuel Substances 0.000 description 4
- 150000001875 compounds Chemical class 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000002918 waste heat Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02G—HOT GAS OR COMBUSTION-PRODUCT POSITIVE-DISPLACEMENT ENGINE PLANTS; USE OF WASTE HEAT OF COMBUSTION ENGINES; NOT OTHERWISE PROVIDED FOR
- F02G5/00—Profiting from waste heat of combustion engines, not otherwise provided for
- F02G5/02—Profiting from waste heat of exhaust gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N3/00—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust
- F01N3/02—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust
- F01N3/04—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using liquids
- F01N3/043—Exhaust or silencing apparatus having means for purifying, rendering innocuous, or otherwise treating exhaust for cooling, or for removing solid constituents of, exhaust using liquids without contact between liquid and exhaust gases
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01N—GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR MACHINES OR ENGINES IN GENERAL; GAS-FLOW SILENCERS OR EXHAUST APPARATUS FOR INTERNAL COMBUSTION ENGINES
- F01N5/00—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy
- F01N5/02—Exhaust or silencing apparatus combined or associated with devices profiting by exhaust energy the devices using heat
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P3/00—Liquid cooling
- F01P3/20—Cooling circuits not specific to a single part of engine or machine
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
- F28D7/00—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall
- F28D7/16—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation
- F28D7/1607—Heat-exchange apparatus having stationary tubular conduit assemblies for both heat-exchange media, the media being in contact with different sides of a conduit wall the conduits being arranged in parallel spaced relation with particular pattern of flow of the heat exchange media, e.g. change of flow direction
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F28—HEAT EXCHANGE IN GENERAL
- F28F—DETAILS OF HEAT-EXCHANGE AND HEAT-TRANSFER APPARATUS, OF GENERAL APPLICATION
- F28F27/00—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus
- F28F27/02—Control arrangements or safety devices specially adapted for heat-exchange or heat-transfer apparatus for controlling the distribution of heat-exchange media between different channels
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2050/00—Applications
- F01P2050/02—Marine engines
- F01P2050/06—Marine engines using liquid-to-liquid heat exchangers
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/12—Improving ICE efficiencies
Definitions
- the present invention relates to method of and system for heat recovery for an internal combustion engine.
- a method for heat recovery for an internal combustion engine which includes introducing a first fluid into heat exchanging elements of a heat exchanger for heating the first fluid, and withdrawing the heated fluid from the heat exchanger elements; and supplying at least one second fluid which is used during the operation of the internal combustion engine and is heated, so as to flow outside and in contact with said heat exchanging elements to transfer heat through walls of said heat exchanging elements from said second fluid to said first fluid.
- the system for heat recovery which has a heat exchanger including a plurality of heat exchanging elements; means for introducing a first fluid into said heat exchanging elements for heating in the first fluid, and withdrawing the heated first fluid from the heat exchanger elements; and supplying at least one second fluid which is used during the operation of the internal combustion engine and is heated, so as to flow outside and in contact with said heat exchanging elements to transfer heat through walls of said heat exchanging element from the second fluid to said first fluid.
- FIG. 1 is a view illustrating schematically a method of and a system for heat recovery for an internal combustion engine
- FIG. 2 is a view showing a heat exchanger of the inventive system.
- FIG. 3 is a view showing additional components of the inventive system.
- FIG. 1 A system for heat recovery operates in accordance with an inventive heat recovery method is illustrated in FIG. 1.
- Reference numeral 19 identifies an internal combustion engine and reference numeral 19 a identifies a crankcase of the engine.
- a lubricant discharge line 19 b extends from the engine to a heat exchanger and in particular to a heat exchanger area 3 b , while a lubricant return line 19 a extends from the heat exchanger area 3 b back to the engine.
- a coolant discharge line 19 g extends from the engine to the heat exchanger and in particular to the heat exchanger area 3 a , while a coolant return line extends from the heat exchanger area 3 a to an engine radiator 19 f.
- An exhaust gas discharge line 5 extends from the engine to the heat exchanger and in particular to a heat exchanger area 3 c and an exhaust gas discharge line 8 extends from the heat exchange area 3 c to atmosphere.
- the heat exchanger has a plurality of heat exchanging elements (tubes) or a tube bundle 3 .
- a first fluid which can be for example a cold water or a motive fluid is introduced into the heat exchanger through a first fluid supply line 1 into an interior of the tubes 3 , and exits from the tubes 3 through a first fluid discharge line 4 . It is then delivered to a first fluid application area 4 a which can be formed for example as a turbine which drives a generator. Then, through discharge line 4 b it is connected to a fluid pump 4 c which pumps the first fluid through the line 1 again into the tubes of the heat exchanger 3 .
- crankcase 19 a is provided with a crankcase vent 23 with a vent line 23 a which leads to a venturi 21 , which draws the crankcase fumes into the engine exhaust pipe 5 .
- the first fluid is circulated through the interior of the pipes of the heat exchanger 1 while the second fluid which is a fluid selected from the group consisting of the coolant, the lubricant, the exhaust, two of these fluids, or all three of these fluids is also supplied to the heat exchanger so as to be in contact with an outer surface of the tubes and to transfer the heat through the wall of the tubes to the first fluid inside the tubes.
- the second fluid which is a fluid selected from the group consisting of the coolant, the lubricant, the exhaust, two of these fluids, or all three of these fluids is also supplied to the heat exchanger so as to be in contact with an outer surface of the tubes and to transfer the heat through the wall of the tubes to the first fluid inside the tubes.
- the tubes in the heat exchanger area 3 c can be coated with a variety of catalytic compounds which can cause some of the constituents of the gas to react with oxygen and in the process release heat.
- the combination of the heat from the exhaust gas and the heat released from the catalytic process is transferred through the walls of the heat exchanging elements to the first fluid inside the tubes.
- electrically controlled valves 11 , 11 a , 11 b , 11 c , 11 d are provided for delivery of air and/or fuel through a heat exchanger housing 7 to various heat exchange areas.
- the electronically controlled valves control the flow of air and/or fuel by way of signals sent by a microprocessor 15 through valve control wires 13 a , 13 b , 13 c , 13 d , 17 a .
- This is in response to information fed to the microprocessor 15 from temperature sensors 12 b , 12 c , 12 d and a gas constituent sensor 18 by way of sensor wires 14 b , 14 c , 14 d , 18 a.
- FIG. 3 shows ignitors 12 b , 12 f , 12 h , which are located downstream of the valves 11 a , 11 b , 11 c , 11 d . They are activated by an ignition power source 12 after having received the signal to do so from the microprocessor 15 through the wire 12 m .
- the microprocessor activates the ignitors 12 c , 12 f , 12 g , 12 h in response to signal received from temperature sensors 12 b , 12 c , 12 d and the gas constituents sensor 18 , by temperature sensor wires 14 b , 14 c , 14 d and the gas constituents wire 18 a.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Exhaust Gas After Treatment (AREA)
Abstract
Heat recovery for internal combustion engine, includes introducing a first fluid into heat exchanging element, and withdrawing the heated first fluid from the heat exchanger elements; and supplying at least one second fluid which is used during the operation of the internal combustion engine and is heated, so as to flow outside and in contact with the heat exchanging elements to transfer heat through walls of the heat exchanging element from the second fluid to said first fluid.
Description
- The present invention relates to method of and system for heat recovery for an internal combustion engine.
- Although the efficiency of the internal combustion engine has been improved remarkably in the past 50 years, it is still difficult to operate such an engine with an efficiency of over 35%. The efficiency drops off dramatically as an engine ages and may deteriorate to less than 10% if it has been improperly maintained. With only 10-35% efficiency, this means that the remaining fuel consumption creates heat which therefore is largely unused or produces un-combusted and partially combusted fuel which generates no work or heat energy and creates environmentally unfavorable compounds. Thus, the waste heat from internal combustion engines is considerable and is not being used constructively. Some solutions directed to this objective are disclosed for example in U.S. Pat. Nos. 4,378,336; 5,035,867; 5,250,489; 5,711,071; 5,869,011; 5,987,885; 6,039,913; and Canadian patents 2184632 and 2247759. It is believed that the use of heat in the internal combustion engine can be further improved.
- Accordingly, it is an object of the present invention to provide an improved method of and system for heat recovery for an internal combustion engine.
- In keeping with these objects and with others which will become apparent hereinafter, one feature of the present invention resides, briefly stated, in a method for heat recovery for an internal combustion engine, which includes introducing a first fluid into heat exchanging elements of a heat exchanger for heating the first fluid, and withdrawing the heated fluid from the heat exchanger elements; and supplying at least one second fluid which is used during the operation of the internal combustion engine and is heated, so as to flow outside and in contact with said heat exchanging elements to transfer heat through walls of said heat exchanging elements from said second fluid to said first fluid.
- In accordance with another feature of the present invention, the system for heat recovery is proposed which has a heat exchanger including a plurality of heat exchanging elements; means for introducing a first fluid into said heat exchanging elements for heating in the first fluid, and withdrawing the heated first fluid from the heat exchanger elements; and supplying at least one second fluid which is used during the operation of the internal combustion engine and is heated, so as to flow outside and in contact with said heat exchanging elements to transfer heat through walls of said heat exchanging element from the second fluid to said first fluid.
- When the method is performed and the system is designed in accordance with the present invention, heat produced during the operation of the internal combustion engine is efficiently utilized.
- The novel features which are considered as characteristic for the present invention are set forth in particular in the appended claims. The invention itself, however, both as to its construction and its method of operation, together with additional objects and advantages thereof, will be best understood from the following description of specific embodiments when read in connection with the accompanying drawings.
- FIG. 1 is a view illustrating schematically a method of and a system for heat recovery for an internal combustion engine;
- FIG. 2 is a view showing a heat exchanger of the inventive system; and
- FIG. 3 is a view showing additional components of the inventive system.
- A system for heat recovery operates in accordance with an inventive heat recovery method is illustrated in FIG. 1.
Reference numeral 19 identifies an internal combustion engine and reference numeral 19 a identifies a crankcase of the engine. A lubricant discharge line 19 b extends from the engine to a heat exchanger and in particular to a heat exchanger area 3 b, while a lubricant return line 19 a extends from the heat exchanger area 3 b back to the engine. A coolant discharge line 19 g extends from the engine to the heat exchanger and in particular to the heat exchanger area 3 a, while a coolant return line extends from the heat exchanger area 3 a to an engine radiator 19 f. An exhaustgas discharge line 5 extends from the engine to the heat exchanger and in particular to a heat exchanger area 3 c and an exhaustgas discharge line 8 extends from the heat exchange area 3 c to atmosphere. - The heat exchanger has a plurality of heat exchanging elements (tubes) or a tube bundle3. A first fluid which can be for example a cold water or a motive fluid is introduced into the heat exchanger through a first fluid supply line 1 into an interior of the tubes 3, and exits from the tubes 3 through a first fluid discharge line 4. It is then delivered to a first fluid application area 4 a which can be formed for example as a turbine which drives a generator. Then, through discharge line 4 b it is connected to a fluid pump 4 c which pumps the first fluid through the line 1 again into the tubes of the heat exchanger 3.
- The crankcase19 a is provided with a crankcase vent 23 with a vent line 23 a which leads to a
venturi 21, which draws the crankcase fumes into theengine exhaust pipe 5. - During the operation of the internal combustion engine the first fluid is circulated through the interior of the pipes of the heat exchanger1 while the second fluid which is a fluid selected from the group consisting of the coolant, the lubricant, the exhaust, two of these fluids, or all three of these fluids is also supplied to the heat exchanger so as to be in contact with an outer surface of the tubes and to transfer the heat through the wall of the tubes to the first fluid inside the tubes.
- The tubes in the heat exchanger area3 c can be coated with a variety of catalytic compounds which can cause some of the constituents of the gas to react with oxygen and in the process release heat. The combination of the heat from the exhaust gas and the heat released from the catalytic process is transferred through the walls of the heat exchanging elements to the first fluid inside the tubes.
- As shown in FIG. 2, electrically controlled
valves 11, 11 a, 11 b, 11 c, 11 d are provided for delivery of air and/or fuel through a heat exchanger housing 7 to various heat exchange areas. The electronically controlled valves control the flow of air and/or fuel by way of signals sent by a microprocessor 15 through valve control wires 13 a, 13 b, 13 c, 13 d, 17 a. This is in response to information fed to the microprocessor 15 fromtemperature sensors 12 b, 12 c, 12 d and a gas constituent sensor 18 by way ofsensor wires 14 b, 14 c, 14 d, 18 a. - FIG. 3 shows ignitors12 b, 12 f, 12 h, which are located downstream of the
valves 11 a, 11 b, 11 c, 11 d. They are activated by anignition power source 12 after having received the signal to do so from the microprocessor 15 through the wire 12 m. The microprocessor activates theignitors 12 c, 12 f, 12 g, 12 h in response to signal received fromtemperature sensors 12 b, 12 c, 12 d and the gas constituents sensor 18, bytemperature sensor wires 14 b, 14 c, 14 d and the gas constituents wire 18 a. - It will be understood that each of the elements described above, or two or more together, may also find a useful application in other types of methods and constructions differing from the types described above.
- While the invention has been illustrated and described as embodied in method of and system for heat recovery for an internal combustion engine, it is not intended to be limited to the details shown, since various modifications and structural changes may be made without departing in any way from the spirit of the present invention.
- Without further analysis, the foregoing will so fully reveal the gist of the present invention that others can, by applying current knowledge, readily adapt it for various applications without omitting features that, from the standpoint of prior art, fairly constitute essential characteristics of the generic or specific aspects of this invention.
Claims (18)
1. A method of heat recovery for internal combustion engine, comprising the steps of introducing a first fluid into said heat exchanging elements of a heat exchanger for heating the first fluid, and withdrawing the heated first fluid from the heat exchanger elements; and supplying at least one second fluid which is used during the operation of the internal combustion engine and is heated, so as to flow outside and in contact with said heat exchanging elements to transfer heat through walls of said heat exchanging element to from said second fluid said first fluid.
2. A method as defined in claim 1 , wherein said supplying the second fluid includes supplying a coolant used during the operation of the internal combustion engine.
3. A method as defined in claim 1 , wherein said supplying the second fluid includes supplying a lubricant used during the operation of the internal combustion engine.
4. A method as defined in claim 1 , wherein said supplying the second fluid includes supplying an exhaust produced during the operation of the internal combustion engine.
5. A method as defined in claim 1 , wherein said supplying the second fluid includes supplying at least two second fluids selected from the group consisting of a coolant, a lubricant and an exhaust of the internal combustion engine.
6. A method as defined in claim 1; and further comprising bringing the second fluid into a contact with a catalytic material applied on an outer surface of said heat exchanging elements to cause a catalytic process and to release heat.
7. A method as defined in claim 1; and further comprising using heat received by the first fluid for creating a heat.
8. A method as defined in claim 1; and further comprising using heat received by the first fluid for creating a work energy.
9. A method as defined in claim 1; and further comprising withdrawing crank case fumes from the internal combustion engine and supplying them into an engine exhaust pipe.
10. A system for heat recovery for an internal combustion engine, comprising a heat exchanger including a plurality of heat exchanging elements; means for introducing a fluid into said heat exchanging element for heating the first fluid, and withdrawing the first heated fluid from the heat exchanger elements; and supplying at least one second fluid which is used during the operation of the internal combustion engine and is heated, so as to flow outside and in contact with said heat exchanging elements to transfer heat through walls of said heat exchanging element from said second fluid to said first fluid.
11. A system as defined in claim 10 , wherein said means for supplying the second fluid includes means for supplying a coolant used during the operation of the internal combustion engine.
12. A system as defined in claim 10 , wherein said means for supplying the second fluid includes means for supplying a lubricant used during the operation of the internal combustion engine.
13. A system as defined in claim 10 , wherein said means for supplying the second fluid includes means for supplying an exhaust produced during the operation of the internal combustion engine.
14. A system as defined in claim 10 , wherein said means for supplying the second fluid includes means for supplying at least two second fluids selected from the group consisting of a coolant, a lubricant and an exhaust of the internal combustion engine.
15. A system as defined in claim 10; and further comprising a catalytic material applied on an outer surface of said heat exchanging elements such that the second fluid is brought in contact with the catalytic material to cause a catalytic process and to release heat.
16. A system as defined in claim 10; and further comprising means for using heat received by the first fluid for creating a heat.
17. A system as defined in claim 10; and further comprising means for using heat received by the first fluid for creating a work energy.
18. A method as defined in claim 10; and further comprising means for withdrawing crankcase fumes from the internal combustion engine and supplying them into an engine exhaust pipe.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/865,711 US20020005040A1 (en) | 2000-07-13 | 2001-05-29 | Method of and system for heat recovery for an internal combustion engine |
CA002361113A CA2361113C (en) | 2001-05-29 | 2001-11-06 | Method and system for heat recovery for an internal combustion engine |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US21803500P | 2000-07-13 | 2000-07-13 | |
US09/865,711 US20020005040A1 (en) | 2000-07-13 | 2001-05-29 | Method of and system for heat recovery for an internal combustion engine |
Publications (1)
Publication Number | Publication Date |
---|---|
US20020005040A1 true US20020005040A1 (en) | 2002-01-17 |
Family
ID=26912505
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
US09/865,711 Abandoned US20020005040A1 (en) | 2000-07-13 | 2001-05-29 | Method of and system for heat recovery for an internal combustion engine |
Country Status (1)
Country | Link |
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US (1) | US20020005040A1 (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090031724A1 (en) * | 2007-07-31 | 2009-02-05 | Victoriano Ruiz | Energy recovery system |
US11977098B2 (en) | 2009-03-25 | 2024-05-07 | Aehr Test Systems | System for testing an integrated circuit of a device and its method of use |
-
2001
- 2001-05-29 US US09/865,711 patent/US20020005040A1/en not_active Abandoned
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US20090031724A1 (en) * | 2007-07-31 | 2009-02-05 | Victoriano Ruiz | Energy recovery system |
US7797938B2 (en) * | 2007-07-31 | 2010-09-21 | Caterpillar Inc | Energy recovery system |
US11977098B2 (en) | 2009-03-25 | 2024-05-07 | Aehr Test Systems | System for testing an integrated circuit of a device and its method of use |
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Legal Events
Date | Code | Title | Description |
---|---|---|---|
STCB | Information on status: application discontinuation |
Free format text: ABANDONED -- FAILURE TO RESPOND TO AN OFFICE ACTION |