US3627206A - Dip-tube liquid vaporizers - Google Patents

Dip-tube liquid vaporizers Download PDF

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Publication number
US3627206A
US3627206A US52881A US3627206DA US3627206A US 3627206 A US3627206 A US 3627206A US 52881 A US52881 A US 52881A US 3627206D A US3627206D A US 3627206DA US 3627206 A US3627206 A US 3627206A
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US
United States
Prior art keywords
piston
cylinder
vaporizer
delivery tube
tube
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.)
Expired - Lifetime
Application number
US52881A
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English (en)
Inventor
Michel Boris
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Societe Technique de Pulverisation SA STEP
Original Assignee
Societe Technique de Pulverisation SA STEP
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Priority claimed from FR6922664A external-priority patent/FR2054453A1/fr
Priority claimed from FR7011073A external-priority patent/FR2081279A6/fr
Application filed by Societe Technique de Pulverisation SA STEP filed Critical Societe Technique de Pulverisation SA STEP
Application granted granted Critical
Publication of US3627206A publication Critical patent/US3627206A/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05B—SPRAYING APPARATUS; ATOMISING APPARATUS; NOZZLES
    • B05B11/00—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use
    • B05B11/01—Single-unit hand-held apparatus in which flow of contents is produced by the muscular force of the operator at the moment of use characterised by the means producing the flow
    • B05B11/10—Pump arrangements for transferring the contents from the container to a pump chamber by a sucking effect and forcing the contents out through the dispensing nozzle
    • B05B11/1001—Piston pumps
    • B05B11/1023—Piston pumps having an outlet valve opened by deformation or displacement of the piston relative to its actuating stem

Definitions

  • a dip-tube vaporizer has a cylinder in which a piston member is slidable.
  • the interior of the cylinder commu' nicates through a slide-valve-controlled opening with a chamber formed between the piston and the cylinder wall.
  • the chamber is filled by a previous stroke so that when a [54] DRIP-TUBE lLllQlUlllD VAPORIZERS lll (Ilnims, 8 Drawing Figs.
  • plunger rod is depressed a shoulder thereon engages the piston 222/321, 222/385, 239/349, 417/549 and the latter acts to pressurize the liquid in the chamber and [51] Int. Cl 1805b 9/04 thus to deliver it through a passage in the plunger rod to an [50] Field oil Search 239/320, atomizer nozzle.
  • the plunger rod rises it draws up liquid 32], 337, 349, 350,354, 355, 361; 222/321, 378, through the dip tube and delivers it to the chamber ready for 382, 383, 384, 385; 417/546, 547, 549, 552 the next dispensing stroke oftheplunger.
  • Piston vaporizers have been proposed in which the dip-tube immersed in the container that holds the liquid to be vaporized is connected to an atomizer nozzle through a pistonand-cylinder unit fitted with valves so as to constitute a suclion and delivery pump. At least one of these valves generally consists of a ball held to its seating by force of gravity. Consequently, such Vaporizers operate only when vertical, with the nozzle higher than the container; for if, in particular, the container be turned upside down and the vaporizer be operated, it is possible for all the liquid contained in the diptube and cylinder to leak out through the nozzle.
  • the object of the present invention is a vaporizer improved so as to overcome this difficulty.
  • a vaporizer comprising a first cylinder containing a first sliding piston, a second cylinder containing a second hollow piston and forming an extension of the first cylinder while itself being extended by a dip-tube, an operating member bearing an atomizer nozzle and fixed to a delivery tube in communication with the nozzle and leading to the interior of the first piston, and a component such as a valve for closing the outlet from the said tube, together with a spring or the like for holding the valve in its closed position, the vaporizer being characterized by the fact that the second piston is extended into the first cylinder by a tubular liquid inlet, which is in communication with the second cylinder and forms one wall of an annular pump chamber within the first cylinder, that the first piston is linked by dead movement to the delivery tube, so that the latter can move axially in relation to the former, and that the vaporizer includes a distribution system, operated by the displacement of the delivery tube and tubular inlet in relation to the first piston, where
  • the result is to isolate the annular chamber from the dip-tube, to connect that chamber to the atomizer nozzle and then to move the first piston so that the liquid contained in the annular chamber is supplied to the nozzle.
  • FIG. I is a longitudinal section of a first embodiment of vaporizer
  • FIGS. 2 to d are similar sections to that of FIG. 1 and show various stages of operation;
  • FIG. 5 is a section of a second embodiment
  • FIG. 6 is a similar section to FIG. 5 and shows a different stage of operation
  • FIGS. 7 and 8 are longitudinal sections of the third embodiment of a vaporizer, showing two different stages of operation.
  • the vaporizer as shown in the drawings, has a cylindrical body I, which has a screw thread for screwing on to the top portion 2 of a bottle or other container holding liquid that is to be vaporized.
  • the rod 7 has a portion 7a, which is larger in cross section, its diameter being substantially the same as the inside diameter of the sleeve 3, the flange Ilaon which, however, has an inside diameter smaller than the portion 7a of the rod 7, so that it restricts the upward movement of the rod.
  • the portion 7a of the rod 7 is followed (moving downwardly) by a portion of smaller cross section 7b, on which the top IIa of a piston II, working in the cylinder 4, forms a sliding fit.
  • the bore 9 terminates in a cavity 9a, in the bottom end face of the portion 712.
  • the diameter of the upper part IIa, of the piston II is smaller than the inside diameter of the sieeve 3 and is joined to the piston II proper by a frustoconical portion, Illb. Upwards movement of the piston II is thus limited by the frustoconical portion IIb coming to bear against the end of the sleeve 3.
  • the cylinder 4 is pierced by an opening I2, which lies opposite the frustoconical portion of the piston II when this is at the top of its stroke.
  • a guide portion I311, on a tubular member I3, can be engaged with a certain amount of play in the bottom end of the piston I I.
  • This tubular member I3 forms an extension of a second hollow piston I3d, which moves in the cylinder 5; and since the diameter of the member I3 is smaller than that of the cylinder 4, there is an annular space within the cylinder, around the member I3.
  • the tubular member I3 contains a'slide valve 15, the top end of which is extended to form a shank 150, which forms a sliding fit in the guide portion I3a of the member I3 and is longer than the guide portion.
  • the tubular member I3 contains a side opening I6, which lies below the valve I5 when this is in its raised position and which serves to place the annular chamber 14 in communication with the interior of the member I3 and hence with the cylinder 5.
  • a spring I7 is interposed between the slide valve I5 and the end of the cylinder 5.
  • This spring biases the valve I5 to the remote end of the member'IZI, to bring the shoulder on the member I3 to bear on the piston II, thereby cutting off the cavity within that piston, and to apply the portion IIb of the piston II against the bottom end of the sleeve 3; it also seeks, through the shank I511 of the valve IE, to thrust the rod 7 upwards, together with the push-member 8 secured thereto.
  • the various members when at rest, thus occupy the positions shown in FIG. I.
  • the purpose of the opening 12 is to allow air to enter the container to which the body 1 is screwed, to replace the volume of liquid vaporized; but this opening I2 is closed when the frustocolnical portion III) of the piston meets the bottom end of the sleeve 3.
  • the chamber 14 is filled with liquid for evaporation, but this chamber is cut off from the outside by virtue of the shoulder on the tubular member I3 bearing against the underside of the piston II. [It will thus be seen that the vaporizer is fully sealed when at rest and cannot leak.
  • air can enter the container through the clearance between the rod 7 and the sleeve 3 and through the opening I2.
  • the various working parts namely the push-member 8, the rod 7, the piston 11, the slide valve 15 and the tubular member 13, move as a single unit.
  • the piston 11 rises within the cylinder 4, thereby lowering the pressure in the chamber 12, which causes liquid to rise from the container, up the dip-tube 6. From this dip-tube, the liquid passes into the cylinder and flows through the opening 16 into the chamber 14, which becomes filled with liquid.
  • the vaporizer is thus ready for further action.
  • the vaporizerjust described has no nonretum valve. It can therefore work in any position, provided, of course, that the free end of the dip-tube 6 is immersed in the liquid to be vaporized.
  • valve 15 and the opening 16 have been dispensed with.
  • the extension 13a of the tubular member 13 bears against the end of the rod 7 and contains an axial passage 13b, extending into a transverse passage I3c, which, when at rest, lies opposite a passage He, in the piston 11.
  • the axial bore 9 in the rod 7 does not extend to the end of the rod and is in communication with a transverse passage 9b, which lies opposite the passage H6 in the piston 11 when the shoulder 71: of the rod is in contact with that piston.
  • the spring 17 is interposed between the bottom of the cylinder 5 and the member 13.
  • the vaporizer is at rest and the chamber 14 is full of liquid to be vaporized.
  • FIGS. 7 and 8 again has its tubular member 13 with the collar 13d forming a piston sliding in the cylinder 5.
  • the distance between the shoulder 7a on the rod 7 and the top 110 of the piston ll is at most equal to the distance by which the shank a projects in relation to the guide portion 130 of the member l3.
  • the pressure produced in the chamber causes the piston 13d to be driven into the cylinder 5 and the shoulder 13b at the top of the member 13 comes away from the underside of the piston 11, thereby establishing communication between the annular chamber 14 and the nozzle 10 (FIG. 8); the liquid precompressed within the chamber thereupon escapes and passes to the nozzle, where it is vaporized.
  • the shank 15a of the slide valve 15 continues to bear against the end of the rod 7, so that the member I3 moves in relation to the valve, but the extent of this movement is insufficient to free the opening 16, so that the annular chamber 14 remains cut off from the cylinder 5.
  • a vaporizer comprising a first cylinder
  • a second, hollow, piston slidable in the second cylinder which cylinder forms an extension ofthe first cylinder, a dip-tube forming an extension of the second cylinder, an operating member carrying means defining an atomizing nozzle, a delivery tube communicating with the nozzle and with the interior of the first piston, means for closing the outlet from the delivery tube, and means for biasing the closure means to the closed position, means defining a tubular liquid inlet extending from the second piston into the first cylinder, said inlet being in communication with the second cylinder,
  • means defining a distribution system operated by displacement of the delivery tube and the tubular inlet in relation to the first piston whereby the annular pump chamber is selectively placed in communication either with the tubular inlet or with the delivery tube.
  • a vaporizer as claimed in claim 2 in which the delivery tube has an external shoulder arranged to abut with the annular piston once the rod has moved a certain distance.
  • a vaporizer as claimed in claim 2 in which the inlet passage has, in the vicinity of the end remote from the diptube, one or more openings by which the pump chamber can be placed in communication with the second cylinder and hence with the dip-tube and further comprising a valve which bears against the delivery tube and is capable of closing the said openings, and is a sliding fit within the tubular inlet,
  • a vaporizer as claimed in claim t comprising a lost motion linkage between the tubular inlet and the delivery tube, the lost motion of that linkage being less than that of the said lost motion linkage between the delivery tube and the first piston.
  • a vaporizer as claimed in claim 41 in which the lost motion of the lost motion linkage between the delivery tube and the first piston is at most equal to the distance existing, in a rest position, between the end of the delivery tube and the tubular inlet.
  • valve has a shank abutting the delivery tube and is extendable upwards in relation to that end of the tubular inlet which is remote from the dip-tube when that end is bearing against the underside of the first piston.
  • a vaporizer as claimed in claim 2 in which that end of the tubular inlet which is remote from the dip-tube abuts against the delivery tube and the first piston has a passage leading into the annular chamber and communicating selectively, according to the piston of the piston, with a passage in the tubular inlet or with a passage in the delivery tube.
  • a vaporizer as claimed in claim ll comprising a sleeve fitted within the first cylinder, the first piston having a frustoconical portion arranged to abut against the interior edge of the sleeve end.
  • a vaporizer as claimed in claim l in which the first cylinder has an opening by which the interior of the vaporizer can be placed in communication with atmosphere, and in which the first piston, when at rest, closes that opening.

Landscapes

  • Reciprocating Pumps (AREA)
  • Containers And Packaging Bodies Having A Special Means To Remove Contents (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)
US52881A 1969-07-07 1970-07-07 Dip-tube liquid vaporizers Expired - Lifetime US3627206A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR6922664A FR2054453A1 (zh) 1969-07-07 1969-07-07
FR7011073A FR2081279A6 (zh) 1970-03-26 1970-03-26

Publications (1)

Publication Number Publication Date
US3627206A true US3627206A (en) 1971-12-14

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
US52881A Expired - Lifetime US3627206A (en) 1969-07-07 1970-07-07 Dip-tube liquid vaporizers

Country Status (9)

Country Link
US (1) US3627206A (zh)
JP (1) JPS5016007B1 (zh)
AT (1) AT311538B (zh)
BE (1) BE752932A (zh)
CH (1) CH523097A (zh)
DE (1) DE2033658A1 (zh)
GB (1) GB1304903A (zh)
NL (1) NL7010044A (zh)
SE (1) SE360433B (zh)

Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3761022A (en) * 1972-04-04 1973-09-25 H Kondo A spring pressure accumulative spray device
US3762647A (en) * 1971-08-26 1973-10-02 T Tada Sprayer
US3770206A (en) * 1971-12-07 1973-11-06 T Tada Single hand operated sprayer
US3774849A (en) * 1971-08-19 1973-11-27 Step Soc Tech Pulverisation Atomisers for perfume and other liquids
US3923250A (en) * 1974-02-08 1975-12-02 Step Soc Tech Pulverisation Liquid perfume atomizers
US3949906A (en) * 1975-03-19 1976-04-13 The Risdon Manufacturing Company Liquid dispensing pump selectively sealable against leakage
JPS5258111A (en) * 1975-11-08 1977-05-13 Mitani Valve Co Ltd Sprayers of pressure accumulating type
US4063854A (en) * 1976-06-01 1977-12-20 Vca Corporation Spray pump assembly
US4117957A (en) * 1977-04-11 1978-10-03 George Duffey Atomizer valve assembly
US4173297A (en) * 1978-01-30 1979-11-06 The Risdon Manufacturing Company Non-throttling manually reciprocated plunger pump for consumer-type liquid dispensing containers
US4273268A (en) * 1977-12-13 1981-06-16 Seaquist Valve Co., Div. Of Pittway Fluid spray pump
US4305530A (en) * 1978-01-23 1981-12-15 Yoshino Kogyosho Co., Ltd. Liquid atomizer
US4607765A (en) * 1984-04-19 1986-08-26 S.A.R. S.P.A. Manually operated pump for the delivery under pressure of liquid substances
US4941595A (en) * 1988-10-10 1990-07-17 Monturas A.S. Spray pump
US4986453A (en) * 1989-05-15 1991-01-22 The Pittway Corporation Atomizing pump
US5102018A (en) * 1989-07-04 1992-04-07 Societe Francaise D'aerosols Et De Bouchage Miniature dispenser having a venting groove in the pump housing
US5199167A (en) * 1989-07-04 1993-04-06 Societe Francaise D/Aerosols Et De Bouchage Method of manufacture of miniature dispenser
US5341956A (en) * 1992-11-05 1994-08-30 Risdon Corporation Method for assembling a dispensing container
WO1997011007A1 (es) * 1995-09-22 1997-03-27 Jose Manuel Navarro Bonet Bombeo por camara de embolos de volumen variable
US5655688A (en) * 1994-10-19 1997-08-12 Aptargroup, Inc. Atomizing pump with high stroke speed enhancement and valve system therefor
US5839617A (en) * 1997-07-29 1998-11-24 Owens-Illinois Closure Inc. Pump dispenser
US5850948A (en) * 1996-09-13 1998-12-22 Valois S.A. Finger-operable pump with piston biasing post
US5899363A (en) * 1997-12-22 1999-05-04 Owens-Illinois Closure Inc. Pump dispenser having a locking system with detents
US6036059A (en) * 1998-06-16 2000-03-14 Risdon/Ams Usa, Inc. Low profile and low force actuation dispensing pump
US20030209567A1 (en) * 2002-03-15 2003-11-13 L'oreal Assembly for packaging and dispensing a product, especially in the form of a sample
EP1525922A2 (en) 2003-10-24 2005-04-27 MICROSPRAY DELTA S.p.A. Simplified invertible pump for dispensing atomized liquids
US6948639B2 (en) * 2003-05-16 2005-09-27 L'oreal Device for packaging and dispensing a product, notably in the form of a sample
US20060261083A1 (en) * 2005-05-20 2006-11-23 Heiner Ophardt Foaming pump with improved air inlet valve
US20070283885A1 (en) * 2006-06-03 2007-12-13 Applied Materials Gmbh & Co. Kg Device for vaporizing materials with a vaporizer tube
CN104903005A (zh) * 2012-11-06 2015-09-09 分配技术有限公司 精准控制缓冲喷雾器(“duo1”)中的输出压力的系统和方法
DE102014221393A1 (de) * 2014-10-21 2016-04-21 F. Holzer Gmbh Pumpkopf für eine Dosiervorrichtung, Dosiervorrichtung sowie Verwendungsmöglichkeiten
US20220134368A1 (en) * 2019-07-19 2022-05-05 Eun Suk YI Two-way pumping device for consumption of residual amount of liquid

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2133259A5 (zh) * 1971-04-08 1972-11-24 Step
JPS52160766U (zh) * 1976-05-31 1977-12-06
US4435135A (en) * 1981-04-03 1984-03-06 Seaquist Valve Company Pump assembly with improved seal
DE3832852A1 (de) * 1988-09-28 1990-03-29 Oeco Tech Entwicklung & Vertri Automatische spruehdose
US5335830A (en) * 1992-10-21 1994-08-09 Bespak Plc Pump dispenser for lotions and/or large doses of product
FR2704524B1 (fr) * 1993-04-29 1995-07-28 Step Dispositif portatif pour la distribution d'une substance fluide.
CN1098200C (zh) 1995-01-27 2003-01-08 株式会社吉野工业所 液体喷出泵
GB2531997B (en) 2014-10-20 2018-08-01 Rieke Packaging Systems Ltd Pump dispenser with deformable pump chamber wall

Cited By (40)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3774849A (en) * 1971-08-19 1973-11-27 Step Soc Tech Pulverisation Atomisers for perfume and other liquids
US3762647A (en) * 1971-08-26 1973-10-02 T Tada Sprayer
US3770206A (en) * 1971-12-07 1973-11-06 T Tada Single hand operated sprayer
US3761022A (en) * 1972-04-04 1973-09-25 H Kondo A spring pressure accumulative spray device
US3923250A (en) * 1974-02-08 1975-12-02 Step Soc Tech Pulverisation Liquid perfume atomizers
US3949906A (en) * 1975-03-19 1976-04-13 The Risdon Manufacturing Company Liquid dispensing pump selectively sealable against leakage
JPS5258111A (en) * 1975-11-08 1977-05-13 Mitani Valve Co Ltd Sprayers of pressure accumulating type
US4063854A (en) * 1976-06-01 1977-12-20 Vca Corporation Spray pump assembly
US4117957A (en) * 1977-04-11 1978-10-03 George Duffey Atomizer valve assembly
US4273268A (en) * 1977-12-13 1981-06-16 Seaquist Valve Co., Div. Of Pittway Fluid spray pump
US4305530A (en) * 1978-01-23 1981-12-15 Yoshino Kogyosho Co., Ltd. Liquid atomizer
US4173297A (en) * 1978-01-30 1979-11-06 The Risdon Manufacturing Company Non-throttling manually reciprocated plunger pump for consumer-type liquid dispensing containers
US4607765A (en) * 1984-04-19 1986-08-26 S.A.R. S.P.A. Manually operated pump for the delivery under pressure of liquid substances
US4941595A (en) * 1988-10-10 1990-07-17 Monturas A.S. Spray pump
US4986453A (en) * 1989-05-15 1991-01-22 The Pittway Corporation Atomizing pump
US5102018A (en) * 1989-07-04 1992-04-07 Societe Francaise D'aerosols Et De Bouchage Miniature dispenser having a venting groove in the pump housing
US5199167A (en) * 1989-07-04 1993-04-06 Societe Francaise D/Aerosols Et De Bouchage Method of manufacture of miniature dispenser
US5341956A (en) * 1992-11-05 1994-08-30 Risdon Corporation Method for assembling a dispensing container
US5655688A (en) * 1994-10-19 1997-08-12 Aptargroup, Inc. Atomizing pump with high stroke speed enhancement and valve system therefor
ES2117936A1 (es) * 1995-09-22 1998-08-16 Navarro Bonet Jose Manuel Bombeo por camara de embolos de volumen variable.
WO1997011007A1 (es) * 1995-09-22 1997-03-27 Jose Manuel Navarro Bonet Bombeo por camara de embolos de volumen variable
US6024540A (en) * 1995-09-22 2000-02-15 Navarro Bonet; Jose Manuel Pump for pumping through a variable volume plunger chamber having a pair of plungers disposed in a stepped cylinder with a slide valve
US5850948A (en) * 1996-09-13 1998-12-22 Valois S.A. Finger-operable pump with piston biasing post
US5839617A (en) * 1997-07-29 1998-11-24 Owens-Illinois Closure Inc. Pump dispenser
EP0894538A2 (en) 1997-07-29 1999-02-03 Owens-Illinois Closure Inc. Pump dispenser
US5899363A (en) * 1997-12-22 1999-05-04 Owens-Illinois Closure Inc. Pump dispenser having a locking system with detents
US6065647A (en) * 1997-12-22 2000-05-23 Owens-Illinois Closure Inc. Pump dispenser having a locking system with detents
US6036059A (en) * 1998-06-16 2000-03-14 Risdon/Ams Usa, Inc. Low profile and low force actuation dispensing pump
US6932246B2 (en) * 2002-03-15 2005-08-23 L'oreal Assembly for packaging and dispensing a product, especially in the form of a sample
US20030209567A1 (en) * 2002-03-15 2003-11-13 L'oreal Assembly for packaging and dispensing a product, especially in the form of a sample
US6948639B2 (en) * 2003-05-16 2005-09-27 L'oreal Device for packaging and dispensing a product, notably in the form of a sample
EP1525922A2 (en) 2003-10-24 2005-04-27 MICROSPRAY DELTA S.p.A. Simplified invertible pump for dispensing atomized liquids
US20060261083A1 (en) * 2005-05-20 2006-11-23 Heiner Ophardt Foaming pump with improved air inlet valve
US7337930B2 (en) 2005-05-20 2008-03-04 Gotohti.Com Inc. Foaming pump with improved air inlet valve
US20070283885A1 (en) * 2006-06-03 2007-12-13 Applied Materials Gmbh & Co. Kg Device for vaporizing materials with a vaporizer tube
CN104903005A (zh) * 2012-11-06 2015-09-09 分配技术有限公司 精准控制缓冲喷雾器(“duo1”)中的输出压力的系统和方法
DE102014221393A1 (de) * 2014-10-21 2016-04-21 F. Holzer Gmbh Pumpkopf für eine Dosiervorrichtung, Dosiervorrichtung sowie Verwendungsmöglichkeiten
US10384221B2 (en) 2014-10-21 2019-08-20 F. Holzer Gmbh Pump head for a metering device, metering device and also possibilities for use
US20220134368A1 (en) * 2019-07-19 2022-05-05 Eun Suk YI Two-way pumping device for consumption of residual amount of liquid
US11673153B2 (en) * 2019-07-19 2023-06-13 Eun Suk YI Two-way pumping device for consumption of residual amount of liquid

Also Published As

Publication number Publication date
NL7010044A (zh) 1971-01-11
SE360433B (zh) 1973-09-24
AT311538B (de) 1973-11-26
BE752932A (fr) 1970-12-16
JPS5016007B1 (zh) 1975-06-10
DE2033658A1 (de) 1971-01-21
CH523097A (fr) 1972-05-31
GB1304903A (zh) 1973-01-31

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