SE445255B - Forfarande vid en vermepump med ett icke-azeotropt koldmedium - Google Patents
Forfarande vid en vermepump med ett icke-azeotropt koldmediumInfo
- Publication number
- SE445255B SE445255B SE8100354A SE8100354A SE445255B SE 445255 B SE445255 B SE 445255B SE 8100354 A SE8100354 A SE 8100354A SE 8100354 A SE8100354 A SE 8100354A SE 445255 B SE445255 B SE 445255B
- Authority
- SE
- Sweden
- Prior art keywords
- fluid
- air
- mixture
- zone
- heat
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims description 26
- 239000000203 mixture Substances 0.000 claims description 90
- 239000012530 fluid Substances 0.000 claims description 51
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 42
- 238000010438 heat treatment Methods 0.000 claims description 26
- 238000001704 evaporation Methods 0.000 claims description 19
- 238000010257 thawing Methods 0.000 claims description 18
- 230000008020 evaporation Effects 0.000 claims description 15
- 238000009833 condensation Methods 0.000 claims description 7
- 230000005494 condensation Effects 0.000 claims description 7
- 239000000470 constituent Substances 0.000 claims description 3
- 230000005484 gravity Effects 0.000 claims description 3
- 238000002485 combustion reaction Methods 0.000 claims description 2
- 239000003795 chemical substances by application Substances 0.000 claims 1
- 230000006835 compression Effects 0.000 claims 1
- 238000007906 compression Methods 0.000 claims 1
- 238000001816 cooling Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 7
- VOPWNXZWBYDODV-UHFFFAOYSA-N Chlorodifluoromethane Chemical compound FC(F)Cl VOPWNXZWBYDODV-UHFFFAOYSA-N 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 5
- 239000007788 liquid Substances 0.000 description 5
- CYRMSUTZVYGINF-UHFFFAOYSA-N trichlorofluoromethane Chemical compound FC(Cl)(Cl)Cl CYRMSUTZVYGINF-UHFFFAOYSA-N 0.000 description 5
- AFYPFACVUDMOHA-UHFFFAOYSA-N chlorotrifluoromethane Chemical compound FC(F)(F)Cl AFYPFACVUDMOHA-UHFFFAOYSA-N 0.000 description 4
- 239000000446 fuel Substances 0.000 description 3
- 229930195733 hydrocarbon Natural products 0.000 description 3
- 150000002430 hydrocarbons Chemical class 0.000 description 3
- 238000011084 recovery Methods 0.000 description 3
- 229940029284 trichlorofluoromethane Drugs 0.000 description 3
- ATUOYWHBWRKTHZ-UHFFFAOYSA-N Propane Chemical compound CCC ATUOYWHBWRKTHZ-UHFFFAOYSA-N 0.000 description 2
- 230000009471 action Effects 0.000 description 2
- PXBRQCKWGAHEHS-UHFFFAOYSA-N dichlorodifluoromethane Chemical compound FC(F)(Cl)Cl PXBRQCKWGAHEHS-UHFFFAOYSA-N 0.000 description 2
- 235000019404 dichlorodifluoromethane Nutrition 0.000 description 2
- 230000033001 locomotion Effects 0.000 description 2
- 230000007246 mechanism Effects 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- 239000004215 Carbon black (E152) Substances 0.000 description 1
- 239000004338 Dichlorodifluoromethane Substances 0.000 description 1
- 239000008186 active pharmaceutical agent Substances 0.000 description 1
- 238000004026 adhesive bonding Methods 0.000 description 1
- 150000001298 alcohols Chemical class 0.000 description 1
- WYTGDNHDOZPMIW-RCBQFDQVSA-N alstonine Natural products C1=CC2=C3C=CC=CC3=NC2=C2N1C[C@H]1[C@H](C)OC=C(C(=O)OC)[C@H]1C2 WYTGDNHDOZPMIW-RCBQFDQVSA-N 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 239000001273 butane Substances 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 125000004432 carbon atom Chemical group C* 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 150000002148 esters Chemical class 0.000 description 1
- 238000000605 extraction Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 230000008014 freezing Effects 0.000 description 1
- 239000008236 heating water Substances 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- OFBQJSOFQDEBGM-UHFFFAOYSA-N n-pentane Natural products CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 1
- 239000002243 precursor Substances 0.000 description 1
- 239000001294 propane Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 230000008929 regeneration Effects 0.000 description 1
- 238000011069 regeneration method Methods 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 238000005476 soldering Methods 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 210000002268 wool Anatomy 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F12/00—Use of energy recovery systems in air conditioning, ventilation or screening
- F24F12/001—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air
- F24F12/002—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air using an intermediate heat-transfer fluid
- F24F12/003—Use of energy recovery systems in air conditioning, ventilation or screening with heat-exchange between supplied and exhausted air using an intermediate heat-transfer fluid using a heat pump
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24F—AIR-CONDITIONING; AIR-HUMIDIFICATION; VENTILATION; USE OF AIR CURRENTS FOR SCREENING
- F24F3/00—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems
- F24F3/12—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling
- F24F3/14—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification
- F24F3/147—Air-conditioning systems in which conditioned primary air is supplied from one or more central stations to distributing units in the rooms or spaces where it may receive secondary treatment; Apparatus specially designed for such systems characterised by the treatment of the air otherwise than by heating and cooling by humidification; by dehumidification with both heat and humidity transfer between supplied and exhausted air
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B30/00—Heat pumps
- F25B30/02—Heat pumps of the compression type
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B39/00—Evaporators; Condensers
- F25B39/02—Evaporators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
- F25B9/006—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant containing more than one component
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D21/00—Defrosting; Preventing frosting; Removing condensed or defrost water
- F25D21/06—Removing frost
- F25D21/12—Removing frost by hot-fluid circulating system separate from the refrigerant system
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/13—Economisers
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/04—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in series
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B6/00—Compression machines, plants or systems, with several condenser circuits
- F25B6/04—Compression machines, plants or systems, with several condenser circuits arranged in series
-
- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/52—Heat recovery pumps, i.e. heat pump based systems or units able to transfer the thermal energy from one area of the premises or part of the facilities to a different one, improving the overall efficiency
-
- 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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/56—Heat recovery units
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Heat-Exchange Devices With Radiators And Conduit Assemblies (AREA)
- Central Heating Systems (AREA)
- Sorption Type Refrigeration Machines (AREA)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FR8001575A FR2474666A1 (fr) | 1980-01-24 | 1980-01-24 | Procede de production de chaleur au moyen d'une pompe a chaleur utilisant un melange de fluides comme agent de travail et l'air comme source de chaleur |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| SE8100354L SE8100354L (sv) | 1981-07-25 |
| SE445255B true SE445255B (sv) | 1986-06-09 |
Family
ID=9237852
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| SE8100354A SE445255B (sv) | 1980-01-24 | 1981-01-22 | Forfarande vid en vermepump med ett icke-azeotropt koldmedium |
Country Status (8)
| Country | Link |
|---|---|
| US (1) | US4350020A (enExample) |
| JP (1) | JPS56110848A (enExample) |
| BE (1) | BE887124A (enExample) |
| CA (1) | CA1172054A (enExample) |
| DE (1) | DE3101776A1 (enExample) |
| FR (1) | FR2474666A1 (enExample) |
| GB (1) | GB2069117B (enExample) |
| SE (1) | SE445255B (enExample) |
Families Citing this family (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2549946B1 (fr) * | 1983-07-29 | 1988-08-05 | Thermetic Ste Nle | Echangeur thermique a ailettes prevu en particulier pour deshumidificateur d'air |
| FR2561363B1 (fr) * | 1984-03-14 | 1987-03-20 | Inst Francais Du Petrole | Procede de mise en oeuvre d'une pompe a chaleur et/ou d'une machine frigorifique a compression comportant un degivrage periodique par inversion de cycle |
| US4598556A (en) * | 1984-09-17 | 1986-07-08 | Sundstrand Corporation | High efficiency refrigeration or cooling system |
| FR2607142B1 (fr) * | 1986-11-21 | 1989-04-28 | Inst Francais Du Petrole | Melange de fluides de travail utilisables dans les cycles thermodynamiques a compression comprenant du trifluoromethane et du chlorodifluoroethane |
| FR2618536B1 (fr) * | 1987-07-22 | 1990-08-24 | Sofath | Dispositif pour ameliorer le fonctionnement des pompes a chaleur |
| US4950316A (en) * | 1989-07-28 | 1990-08-21 | Charles Harris | Dehumidification system |
| US5076064A (en) * | 1990-10-31 | 1991-12-31 | York International Corporation | Method and refrigerants for replacing existing refrigerants in centrifugal compressors |
| FR2687464A1 (fr) * | 1992-02-19 | 1993-08-20 | Bernier Jacques | Caloducs a melange zeotropique de fluides. |
| CN1114040A (zh) * | 1994-06-14 | 1995-12-27 | 宏贯股份有限公司 | 空气能热量循环交换机 |
| US6490874B2 (en) * | 2000-12-21 | 2002-12-10 | International Business Machines Corporation | Recuperative environmental conditioning unit |
| AU2003304208A1 (en) * | 2003-06-12 | 2005-01-04 | Milind V. Rane | Multiutility vapor compression system |
| DE102004001875B4 (de) * | 2004-01-14 | 2023-03-30 | Thomas Hake | Modulares Dachsystem |
| WO2008057647A2 (en) * | 2006-11-07 | 2008-05-15 | Tiax Llc. | Dehumidification |
| US20110259551A1 (en) * | 2010-04-23 | 2011-10-27 | Kazushige Kasai | Flow distributor and environmental control system provided the same |
| MD4208C1 (ro) * | 2011-10-12 | 2013-09-30 | Институт Энергетики Академии Наук Молдовы | Pompă de căldură cu tub de vârtejuri |
| EP2587197B1 (en) * | 2011-10-28 | 2016-11-16 | Urenco Limited | Defrosting |
| KR101766045B1 (ko) | 2015-10-08 | 2017-08-08 | 현대자동차주식회사 | 차량용 공조시스템 |
| KR101755926B1 (ko) * | 2015-12-09 | 2017-07-10 | 현대자동차주식회사 | 차량용 공조시스템 |
| WO2017214111A1 (en) * | 2016-06-06 | 2017-12-14 | Labstrong Corp. | Device for the purification of water using a heat pump |
| KR102796856B1 (ko) * | 2019-07-24 | 2025-04-16 | 현대자동차주식회사 | 차량용 공조시스템 |
| JP6918257B1 (ja) * | 2021-01-28 | 2021-08-11 | 日立ジョンソンコントロールズ空調株式会社 | 空気調和機及び熱交換器 |
Family Cites Families (19)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2100867A (en) * | 1936-07-31 | 1937-11-30 | Gen Electric | Air conditioning system |
| US2148238A (en) * | 1936-10-24 | 1939-02-21 | Hermann J Krackowizer | Air circulator |
| US2293482A (en) * | 1941-06-26 | 1942-08-18 | Gen Electric | Heat pump |
| US2492725A (en) * | 1945-04-09 | 1949-12-27 | Carrier Corp | Mixed refrigerant system |
| US2759708A (en) * | 1953-11-02 | 1956-08-21 | Drying Systems Inc | Air to air heat pump apparatus |
| US2770107A (en) * | 1954-02-15 | 1956-11-13 | Drying Systems Inc | Air to air heat pump apparatus |
| US3214929A (en) * | 1962-10-29 | 1965-11-02 | Robert V Anderson | Refrigeration unit having superheated gas feedback |
| US3477240A (en) * | 1968-03-25 | 1969-11-11 | Refrigeration System Ab | Refrigerating method and system for maintaining substantially constant temperature |
| FR2088027A1 (en) * | 1970-05-08 | 1972-01-07 | Frigoscandia Contracting Ab | Defrosting refrigerant evaporator - employing a liquid agent to reduce freezing point |
| CH564129A5 (enExample) * | 1972-05-19 | 1975-07-15 | Linde Ag | |
| FR2274873A2 (fr) * | 1974-06-12 | 1976-01-09 | Lafumas Pierre | Installation de climatisation |
| DE2509038C3 (de) * | 1975-03-01 | 1979-05-03 | Planungsbuero Obermeyer, Gesellschaft Fuer Planungen Im Bauwesen Mbh, 8000 Muenchen | Gerät zum Klimatisieren von Raumluft |
| DE2612997A1 (de) * | 1975-03-27 | 1976-10-07 | Electricite & Isolation Elise | Verfahren zum aufheizen oder abkuehlen eines raumes unter anwendung eines thermodynamischen kreisprozesses und vorrichtung zur durchfuehrung des verfahrens |
| DE2518730A1 (de) * | 1975-04-26 | 1976-11-04 | Juergens Walter | Verdampfer fuer kuehlaggregate |
| FR2328163A1 (fr) * | 1975-10-16 | 1977-05-13 | Chauffe Cie Gle | Perfectionnements aux dispositifs de chauffage des locaux par l'utilisation de pompes a chaleur |
| DE2557314A1 (de) * | 1975-12-19 | 1977-06-30 | Licentia Gmbh | Verfahren und anordnung zum abtauen eines verdampfers |
| FR2337855A1 (fr) * | 1976-01-07 | 1977-08-05 | Inst Francais Du Petrole | Procede de production de chaleur utilisant une pompe de chaleur fonctionnant avec un melange de fluides |
| DE2639339A1 (de) * | 1976-09-01 | 1978-03-09 | Motorheizung Gmbh | Vor vereisung gesicherte verdampferanordnung fuer waermepumpen zur aufnahme von waerme aus der umgebungsluft |
| FR2394767A1 (fr) * | 1977-06-17 | 1979-01-12 | Air Liquide | Perfectionnements a la pompe a chaleur |
-
1980
- 1980-01-24 FR FR8001575A patent/FR2474666A1/fr active Granted
-
1981
- 1981-01-19 BE BE1/10102A patent/BE887124A/fr not_active IP Right Cessation
- 1981-01-21 DE DE19813101776 patent/DE3101776A1/de not_active Withdrawn
- 1981-01-22 SE SE8100354A patent/SE445255B/sv not_active IP Right Cessation
- 1981-01-23 CA CA000369210A patent/CA1172054A/fr not_active Expired
- 1981-01-23 US US06/227,844 patent/US4350020A/en not_active Expired - Lifetime
- 1981-01-23 JP JP954181A patent/JPS56110848A/ja active Pending
- 1981-01-23 GB GB8102176A patent/GB2069117B/en not_active Expired
Also Published As
| Publication number | Publication date |
|---|---|
| CA1172054A (fr) | 1984-08-07 |
| JPS56110848A (en) | 1981-09-02 |
| DE3101776A1 (de) | 1981-12-17 |
| BE887124A (fr) | 1981-07-20 |
| GB2069117B (en) | 1984-02-29 |
| FR2474666B1 (enExample) | 1984-12-28 |
| GB2069117A (en) | 1981-08-19 |
| FR2474666A1 (fr) | 1981-07-31 |
| SE8100354L (sv) | 1981-07-25 |
| US4350020A (en) | 1982-09-21 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| NUG | Patent has lapsed |
Ref document number: 8100354-3 Effective date: 19891201 Format of ref document f/p: F |