CA1274357A - Swimming pool cleaning device - Google Patents
Swimming pool cleaning deviceInfo
- Publication number
- CA1274357A CA1274357A CA000522258A CA522258A CA1274357A CA 1274357 A CA1274357 A CA 1274357A CA 000522258 A CA000522258 A CA 000522258A CA 522258 A CA522258 A CA 522258A CA 1274357 A CA1274357 A CA 1274357A
- Authority
- CA
- Canada
- Prior art keywords
- valve
- flow channel
- cleaning device
- swimming pool
- pool cleaning
- 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 - Fee Related
Links
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H4/00—Swimming or splash baths or pools
- E04H4/14—Parts, details or accessories not otherwise provided for
- E04H4/16—Parts, details or accessories not otherwise provided for specially adapted for cleaning
- E04H4/1654—Self-propelled cleaners
- E04H4/1663—Self-propelled cleaners the propulsion resulting from an intermittent interruption of the waterflow through the cleaner
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Reciprocating Pumps (AREA)
- Safety Valves (AREA)
- Devices For Medical Bathing And Washing (AREA)
- Sanitary Device For Flush Toilet (AREA)
Abstract
A B S T R A C T
A flow interruption type swimming pool cleaning device is described including a head having a flow channel 4 therethrough. A valve 5, biased to an open position, is arranged to close the flow channel intermittently when water flows through the flow channel in use. A variable volume chamber 12 communicating with the flow channel is provided downstream of the valve for enhancing operation of the valve in use.
A flow interruption type swimming pool cleaning device is described including a head having a flow channel 4 therethrough. A valve 5, biased to an open position, is arranged to close the flow channel intermittently when water flows through the flow channel in use. A variable volume chamber 12 communicating with the flow channel is provided downstream of the valve for enhancing operation of the valve in use.
Description
~;~7~357 ~ I~RODUCTI~J
: T~IS I~YEhTIOl~ relates to an automatic swimming pool cleaning device of the kind wherein ::
means are provided for interrupting flow of water sucked through the device to thereby cause the device to move across a submerged surface to be cleaned.
BAC~GROU~D TO T~E I~V~I~J
The above type of device is well known and is described 1n various patent speci~ications such :
as South African Patent ~o 71/1024 (Raubenheimer), United States Patent ~o 4023227 (Chauvier), and United States~Patent ~o 4133068 (Hoffmann). ~ :
, ~: ~ : : : :: ::
~;~t7~357 It is an object of this invention to provide a swimming pool cleaning device which operates efficiently and is less susceptible to operational malfunction caused by foreign matter becoming lodged within the device compared with many prior art devices.
SU~MA~Y OF T~E I~VENTIO~
According to the invention there is provided a swimming pool cleaning device comprising a head having an inlet opening adapted to be 1~ located adjacent a submerged surface to be cleaned, an outlet from the head connected to the inlet through a flow channel, a valve associated with the : flow channel and biased to an open position, the valve being arranged to mov~ to a closed position to at least substantially close the flow channel intermittently when water flows through the channel in use, and a variable volume chamber communicating - with the flow channel downstream of the valve and bi~qed to a di~tended c~ndition for enhanc~ng - . , ~
:
, - : ~ '., ~7~3~
operation of the valve in use, the head and flow channel being operative to cause movement thereof across a submerged surface in consequence of the intermittent closure of the valve, in use.
Further features of the invention provide for the valve to be either a spring loaded plunger valve or a pivotable flap valve arranged to co-operate with a valve seat formed in the flow channel; for the variable volume chamber to be located either in a branch off the flow channel or to form an enlarged ~one of the channel in its length; and for the variable volume chamber to comprise a cup shaped diaphragm. As an alternative the variable volume chamber may comprise a spring ~ 15 loaded piston acting in a cylinder.
- The invention also provides for the spring loading of the plunger or flap valve to be adjustable, and, for adjustible means to be associated with the variable volume chamber for urging it to a distended condition.
/. . .
- '; -~ . -- .
- -, .... .' ' ''; ,' ~: '"' . .
~zt7~s7 Preferably the head is of the type in which the inlet is located within a oot of the head, the foot being surrounded by a flexible disc and wherein the channel extends at an incline to the disc and thus at an incline to the submerged surface being cleaned.
!
These and further features of the invention will become more apparent from the following description of various embodiments thereof given below by way of examples with reference being made to the accompanying drawings:
BRIEF DESC~IPTI~ OF THE DR~UI~GS
~ In the drawings:--~ Figure 1 is a cross-sectional side elevation of one form of swimming pool clean-ing device ~cco-ding to the invention, .
. ~ . .. .
.
:' . - ~ . .. : ... . ~
~74~57 Figure 2 is a similar view through a second embodiment of the invention; and, Figure 3 is a similar view through an alternative variable volume chamber for the embodiment of Yigure 2.
DETAILED DESCRIPTI~ 0~ T~E DRA~GS
Referring initially to Figure l, a swimming pool cleaner is shown whereof a head l, has an inlet opening 2, an outlet opening 3 and a flow channel 4 connecting the inlet with the outlet. A plunger type of valve, having a plunger 5 carrying a closure 6 and being slidable in a cylinder 7 therefor is arranged such that the closure can engage a valve seat 8 encircliny the flow channel near the inlet end to close the flow channel through the head l intermittently as will be described below.
A tension spring 9 biases the plunger 5 :
. , ~ - ..
:~Z7gL35i7 .
away from the valve seat 8. One end of the tension spring is mounted inside the plunger, which is hollow, and the other end lO is mounted to a screw threaded plug Ll which screws into the back of the cylinder 7. By screwing the plug into the cylinder to a greater or lesser extent the tension on the spring 9 can be adjusted.
The closure 6 is of a shape and configuration which will ensure that when, in use, water is drawn through the flow channel from the inlet to the outlet the plunger will be drawn , towards the valve seat 8 against the action of the - tension spring in order to substantially close the valve intermittently.
'' - 15 Such intermittent closure of the valve is enhanced, as provided~by the invention, by the :: presence of a variable volume chamber 12, which, in this embodiment:of the invention, assumes the form of a cup shaped elastomeric diaphragm 13 having its periphery attached to a ri~la pLate 14 ~arried ~n a ,.
::
:
.. . --~ 'J~ll ~1~
connecting tube 15 communicatiny between the inside of the variable volume chamber and the channel 4.
The diaphragm, being elastomeric, is automatically biased to a aistended condition but the bias is - 5 enhanced by the presence of a compression spring - 16.
A foot 17 is formed around the inlet 2, the foot 17 having a suction port 18 formed therein for allowing by-pass water to enter into the inlet
: T~IS I~YEhTIOl~ relates to an automatic swimming pool cleaning device of the kind wherein ::
means are provided for interrupting flow of water sucked through the device to thereby cause the device to move across a submerged surface to be cleaned.
BAC~GROU~D TO T~E I~V~I~J
The above type of device is well known and is described 1n various patent speci~ications such :
as South African Patent ~o 71/1024 (Raubenheimer), United States Patent ~o 4023227 (Chauvier), and United States~Patent ~o 4133068 (Hoffmann). ~ :
, ~: ~ : : : :: ::
~;~t7~357 It is an object of this invention to provide a swimming pool cleaning device which operates efficiently and is less susceptible to operational malfunction caused by foreign matter becoming lodged within the device compared with many prior art devices.
SU~MA~Y OF T~E I~VENTIO~
According to the invention there is provided a swimming pool cleaning device comprising a head having an inlet opening adapted to be 1~ located adjacent a submerged surface to be cleaned, an outlet from the head connected to the inlet through a flow channel, a valve associated with the : flow channel and biased to an open position, the valve being arranged to mov~ to a closed position to at least substantially close the flow channel intermittently when water flows through the channel in use, and a variable volume chamber communicating - with the flow channel downstream of the valve and bi~qed to a di~tended c~ndition for enhanc~ng - . , ~
:
, - : ~ '., ~7~3~
operation of the valve in use, the head and flow channel being operative to cause movement thereof across a submerged surface in consequence of the intermittent closure of the valve, in use.
Further features of the invention provide for the valve to be either a spring loaded plunger valve or a pivotable flap valve arranged to co-operate with a valve seat formed in the flow channel; for the variable volume chamber to be located either in a branch off the flow channel or to form an enlarged ~one of the channel in its length; and for the variable volume chamber to comprise a cup shaped diaphragm. As an alternative the variable volume chamber may comprise a spring ~ 15 loaded piston acting in a cylinder.
- The invention also provides for the spring loading of the plunger or flap valve to be adjustable, and, for adjustible means to be associated with the variable volume chamber for urging it to a distended condition.
/. . .
- '; -~ . -- .
- -, .... .' ' ''; ,' ~: '"' . .
~zt7~s7 Preferably the head is of the type in which the inlet is located within a oot of the head, the foot being surrounded by a flexible disc and wherein the channel extends at an incline to the disc and thus at an incline to the submerged surface being cleaned.
!
These and further features of the invention will become more apparent from the following description of various embodiments thereof given below by way of examples with reference being made to the accompanying drawings:
BRIEF DESC~IPTI~ OF THE DR~UI~GS
~ In the drawings:--~ Figure 1 is a cross-sectional side elevation of one form of swimming pool clean-ing device ~cco-ding to the invention, .
. ~ . .. .
.
:' . - ~ . .. : ... . ~
~74~57 Figure 2 is a similar view through a second embodiment of the invention; and, Figure 3 is a similar view through an alternative variable volume chamber for the embodiment of Yigure 2.
DETAILED DESCRIPTI~ 0~ T~E DRA~GS
Referring initially to Figure l, a swimming pool cleaner is shown whereof a head l, has an inlet opening 2, an outlet opening 3 and a flow channel 4 connecting the inlet with the outlet. A plunger type of valve, having a plunger 5 carrying a closure 6 and being slidable in a cylinder 7 therefor is arranged such that the closure can engage a valve seat 8 encircliny the flow channel near the inlet end to close the flow channel through the head l intermittently as will be described below.
A tension spring 9 biases the plunger 5 :
. , ~ - ..
:~Z7gL35i7 .
away from the valve seat 8. One end of the tension spring is mounted inside the plunger, which is hollow, and the other end lO is mounted to a screw threaded plug Ll which screws into the back of the cylinder 7. By screwing the plug into the cylinder to a greater or lesser extent the tension on the spring 9 can be adjusted.
The closure 6 is of a shape and configuration which will ensure that when, in use, water is drawn through the flow channel from the inlet to the outlet the plunger will be drawn , towards the valve seat 8 against the action of the - tension spring in order to substantially close the valve intermittently.
'' - 15 Such intermittent closure of the valve is enhanced, as provided~by the invention, by the :: presence of a variable volume chamber 12, which, in this embodiment:of the invention, assumes the form of a cup shaped elastomeric diaphragm 13 having its periphery attached to a ri~la pLate 14 ~arried ~n a ,.
::
:
.. . --~ 'J~ll ~1~
connecting tube 15 communicatiny between the inside of the variable volume chamber and the channel 4.
The diaphragm, being elastomeric, is automatically biased to a aistended condition but the bias is - 5 enhanced by the presence of a compression spring - 16.
A foot 17 is formed around the inlet 2, the foot 17 having a suction port 18 formed therein for allowing by-pass water to enter into the inlet
2. A flexible disc 19 is fitted around the foot 17 and, in use, the dise 19 and foot 17 will be located against a surface 20 to be cleaned.
- The foot and disc are arranged such that, when they are in firm contact with the submerged surface, the axis of the flow channel i5 inclined to such surface at about 45 for reasons tbat will be quite apparent to those skilled in the art.
- The outlet 3 is, for use, connected through a swivel coupling 21 to a flexible hose / :
- ~ ' ., . ~' ~ ' '. ' . -- , . .. : , . - : .
- ,, - .
- ' ~ -.
~2'~7 _ 9 _ (not shown), the hose being connected to the suction side of a pump which will, in use, draw water through the head and the hose to a swimming pool filter.
In use, as water is drawn through the head : 1 the plunger 5 will be urged to move against the action of the tension spring so as to move the closure towards, and generally fully onto, the ` valve seat 7. As the closure 6 strikes the valve seat 8 the flow in the flow channel 4 is interrupted and pressure in the flow channel 4 is suddenly decreased. This decrease in pressure in the flow channel is conveyed through the connecting : tube 15 to the interior of the variable volume chamber. This causes the diaphragm 13 to collapse .: against the action of the compression spring 16, thereby, at least to some extent, xelieving the suction orce inside the flow channel 4 and allowing the closure 6 and plunyer 5 to moYe away from the valve seat 8 under the action of the tenslon syring 9 ` '' :
-,, 7~3~9 - The ~low will thereafter recommence through the flow channel and the closure will once again be drawn against the valve seat 8 to thereby repeat the cycle. This cyclical opening and closing of the flow channel will cause the pool cleaning device to move across the surface 20 to be -: cleaned by the virtue of the inclined, and thus non-symmetrical axial direction in which the flow channel extends.
10 It will be appreciated that in order for the device to operate properly, and over a wide range of suction pressures, it is important that the arrangement of the various components be optimally selected. Thus, the dimension indicated in Figure l by the letter "x", which is the distance between the valve seat 8 and the inlet to the connecting tube 15 as well as the dimension indicated in Figure l by the letter "y", which is the length of the connecting tube 15, should be - 20 selected with a consideration of the flow and hydrostatic forces which arise in a device of this - : . . : . ... .
.
~Z'7~ 7 nature operating in these conditions. ~Jhere the length of the connecting tube is appreciable it may, of course, be coiled for convenience. The diameter of the flow channel 4 and that of the connecting tube 15 are also important elements to be taken into consideration. The final configuration will of course depend on the range of suc.ion pressures with which the device is to operate and the desired flow rate through the device. For specific applications the force on the tension spring 9 and the compression spring 16 may be adjusted or the springs may be replaceable r by more appropriat ones.
~ere required a flow control valve may be fitted in the suction hose or flow channel to provide optimal flow rates for any specific cleaning device or setting thereof.
It will be appreciated that the variable volume chamber 12 may take a different form from -; 20 that described above Specifically, as shown in , / .
., .
- - ~ .
.:' ' ' ~:74~S7 Figure ~, there is envisaged a piston 22 movable in a co-operant cylinder 23 carried by a connecting tube 24 whereby the interior 25 of the piston and cylinder assembly communicates with the flow channel. The piston is biased by a compression spring 26 towards a position in which the interior is distended as required by the invention. The interior can therefore change in volume very much along the lines of the diaphragm arrangement described above.
A further alternative is illustrated in Figure 3 in which the variable volume chamber 7, assumes the form of an enlarged zone of the flow channel, the chamber being defined by an elastomeric wall 28 which is sufficiently rigid so as not to re~uire a spring to urge it towards the distended condition.
Figure 2 also illustrates an alternative form of valve. In this case the valve closure 29 assumes the form of a flap pivotally mounted at a . ~
. . . . . . . .
.
' : ' ' ' ~ " . ' :
.
~7~;~S7 position laterally off-set above the valve seat 30 which is simila~ly located to that illustrated in Figure 1. A compression spring 31 serves to bias the valve to the open position such spring being located between the periphery of the valve seat and the pivot 32 carrying the flap valve closure. In this case a adjustable stop 33 may be provided to limit the movement of the flap valve in the direction of opening thereof.
l~umerous other variations can be made to the embodiment of the invention described above without departing from the scope of the invention which is limited only to the presence of a variable volume chamber communicating with the flow channel through the device which has a valve biased to the open position in its flow channel.
.
- The foot and disc are arranged such that, when they are in firm contact with the submerged surface, the axis of the flow channel i5 inclined to such surface at about 45 for reasons tbat will be quite apparent to those skilled in the art.
- The outlet 3 is, for use, connected through a swivel coupling 21 to a flexible hose / :
- ~ ' ., . ~' ~ ' '. ' . -- , . .. : , . - : .
- ,, - .
- ' ~ -.
~2'~7 _ 9 _ (not shown), the hose being connected to the suction side of a pump which will, in use, draw water through the head and the hose to a swimming pool filter.
In use, as water is drawn through the head : 1 the plunger 5 will be urged to move against the action of the tension spring so as to move the closure towards, and generally fully onto, the ` valve seat 7. As the closure 6 strikes the valve seat 8 the flow in the flow channel 4 is interrupted and pressure in the flow channel 4 is suddenly decreased. This decrease in pressure in the flow channel is conveyed through the connecting : tube 15 to the interior of the variable volume chamber. This causes the diaphragm 13 to collapse .: against the action of the compression spring 16, thereby, at least to some extent, xelieving the suction orce inside the flow channel 4 and allowing the closure 6 and plunyer 5 to moYe away from the valve seat 8 under the action of the tenslon syring 9 ` '' :
-,, 7~3~9 - The ~low will thereafter recommence through the flow channel and the closure will once again be drawn against the valve seat 8 to thereby repeat the cycle. This cyclical opening and closing of the flow channel will cause the pool cleaning device to move across the surface 20 to be -: cleaned by the virtue of the inclined, and thus non-symmetrical axial direction in which the flow channel extends.
10 It will be appreciated that in order for the device to operate properly, and over a wide range of suction pressures, it is important that the arrangement of the various components be optimally selected. Thus, the dimension indicated in Figure l by the letter "x", which is the distance between the valve seat 8 and the inlet to the connecting tube 15 as well as the dimension indicated in Figure l by the letter "y", which is the length of the connecting tube 15, should be - 20 selected with a consideration of the flow and hydrostatic forces which arise in a device of this - : . . : . ... .
.
~Z'7~ 7 nature operating in these conditions. ~Jhere the length of the connecting tube is appreciable it may, of course, be coiled for convenience. The diameter of the flow channel 4 and that of the connecting tube 15 are also important elements to be taken into consideration. The final configuration will of course depend on the range of suc.ion pressures with which the device is to operate and the desired flow rate through the device. For specific applications the force on the tension spring 9 and the compression spring 16 may be adjusted or the springs may be replaceable r by more appropriat ones.
~ere required a flow control valve may be fitted in the suction hose or flow channel to provide optimal flow rates for any specific cleaning device or setting thereof.
It will be appreciated that the variable volume chamber 12 may take a different form from -; 20 that described above Specifically, as shown in , / .
., .
- - ~ .
.:' ' ' ~:74~S7 Figure ~, there is envisaged a piston 22 movable in a co-operant cylinder 23 carried by a connecting tube 24 whereby the interior 25 of the piston and cylinder assembly communicates with the flow channel. The piston is biased by a compression spring 26 towards a position in which the interior is distended as required by the invention. The interior can therefore change in volume very much along the lines of the diaphragm arrangement described above.
A further alternative is illustrated in Figure 3 in which the variable volume chamber 7, assumes the form of an enlarged zone of the flow channel, the chamber being defined by an elastomeric wall 28 which is sufficiently rigid so as not to re~uire a spring to urge it towards the distended condition.
Figure 2 also illustrates an alternative form of valve. In this case the valve closure 29 assumes the form of a flap pivotally mounted at a . ~
. . . . . . . .
.
' : ' ' ' ~ " . ' :
.
~7~;~S7 position laterally off-set above the valve seat 30 which is simila~ly located to that illustrated in Figure 1. A compression spring 31 serves to bias the valve to the open position such spring being located between the periphery of the valve seat and the pivot 32 carrying the flap valve closure. In this case a adjustable stop 33 may be provided to limit the movement of the flap valve in the direction of opening thereof.
l~umerous other variations can be made to the embodiment of the invention described above without departing from the scope of the invention which is limited only to the presence of a variable volume chamber communicating with the flow channel through the device which has a valve biased to the open position in its flow channel.
.
Claims (9)
1. A swimming pool cleaning device comprising a head having an inlet opening adapted to be located adjacent a submerged surface to be cleaned, an outlet from the head connected to the inlet through a flow channel, a valve associated with the flow channel and biased to an open position, the valve being arranged to move to a closed position to at least substantially close the flow channel intermittently when water flows through the channel in use, and a variable volume chamber communicating with the flow channel downstream of the valve and biased to a distended condition for enhancing operation of the valve in use, the head and flow channel being operative to cause movement thereof across a submerged surface in consequence of the intermittent closure of the valve in use.
2. A swimming pool cleaning device as claimed in Claim 1, wherein the valve is a spring loaded plunger valve having a closure arranged to co-operate with a valve seat formed in the flow channel.
3. A swimming pool cleaning device as claimed in Claim 1 in which the valve is a spring loaded flap valve.
4. A swimming pool cleaning device as claimed in Claim 1 wherein the variable volume chamber is located in a branch off the flow channel.
5. A swimming pool cleaning device as claimed in Claim 4 wherein the variable volume chamber comprises a cup shaped diaphragm.
6. A swimming pool cleaning device as claimed in Claim 1 wherein the variable volume chamber comprises a spring loaded piston acting in a cylinder.
7. A swimming pool cleaning device as claimed in Claim 1 in which the variable volume chamber is formed by an enlarged zone of the flow channel defined by an elastomeric wall.
8. A swimming pool cleaning device as claimed in Claim 3 wherein the bias of the valve in an open condition is adjustable.
9. A swimming pool cleaning device as claimed in Claim 5 wherein the variable volume chamber includes a variable element which is spring biased and the spring biasing is adjustable.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ZA85/8515 | 1985-11-06 | ||
| ZA858515 | 1985-11-06 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1274357A true CA1274357A (en) | 1990-09-25 |
Family
ID=25578144
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000522258A Expired - Fee Related CA1274357A (en) | 1985-11-06 | 1986-11-05 | Swimming pool cleaning device |
Country Status (8)
| Country | Link |
|---|---|
| AU (1) | AU593302B2 (en) |
| BR (1) | BR8605509A (en) |
| CA (1) | CA1274357A (en) |
| DE (1) | DE3637902A1 (en) |
| ES (1) | ES2003477A6 (en) |
| FR (1) | FR2589508A1 (en) |
| GB (1) | GB2182551B (en) |
| IT (1) | IT1215052B (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2203935B (en) * | 1987-04-16 | 1991-01-09 | Automated Pool Cleaners | Swimming pool cleaning device |
| CA2177775A1 (en) * | 1995-05-31 | 1996-12-01 | Duilio Durigon | Cleaner for a submerged surface |
| AU720259B2 (en) * | 1996-07-25 | 2000-05-25 | Corrupipe Cc | Relief valve |
| ES2177352B1 (en) * | 1997-11-03 | 2004-09-01 | Summer Moon Pty Ltd | AUTOMATIC POOL CLEANING DEVICE AND CORRESPONDING VALVE ASSEMBLY. |
| US6112354A (en) * | 1998-10-21 | 2000-09-05 | Polaris Pool Systems, Inc. | Suction powered cleaner for swimming pools |
| AU2001266253B2 (en) * | 2000-06-30 | 2005-07-21 | Corrupipe Cc | Swimming pool cleaner |
| AUPR382301A0 (en) * | 2001-03-20 | 2001-04-12 | K.K. Australia Pty Ltd | An improved valve arrangement for an automatic pool cleaner |
| ES1060618Y (en) | 2005-06-16 | 2006-02-01 | Inversiones Deloscua S L | "POOL FUNDS CLEANING DEVICE". |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3803658A (en) * | 1971-01-14 | 1974-04-16 | J Raubenheimer | Cleaning devices |
| CA1066462A (en) * | 1975-02-25 | 1979-11-20 | Fernand L.O.J. Chauvier | Apparatus for cleaning submerged surfaces |
| AU502993B2 (en) * | 1976-08-23 | 1979-08-16 | Baracuda (Proprietary) Ltd. | Underwater suction cleaner |
| AU576806B2 (en) * | 1983-12-28 | 1988-09-08 | Sweepy International S.A. | Diaphragm valve assembly for pool cleaner |
-
1986
- 1986-11-04 GB GB08626322A patent/GB2182551B/en not_active Expired
- 1986-11-05 CA CA000522258A patent/CA1274357A/en not_active Expired - Fee Related
- 1986-11-05 AU AU64853/86A patent/AU593302B2/en not_active Ceased
- 1986-11-06 IT IT8609518A patent/IT1215052B/en active
- 1986-11-06 FR FR8615509A patent/FR2589508A1/en active Pending
- 1986-11-06 ES ES8602936A patent/ES2003477A6/en not_active Expired
- 1986-11-06 BR BR8605509A patent/BR8605509A/en unknown
- 1986-11-06 DE DE19863637902 patent/DE3637902A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| DE3637902A1 (en) | 1987-05-07 |
| IT1215052B (en) | 1990-01-31 |
| GB2182551B (en) | 1988-12-29 |
| BR8605509A (en) | 1987-08-11 |
| AU6485386A (en) | 1987-05-14 |
| GB8626322D0 (en) | 1986-12-03 |
| GB2182551A (en) | 1987-05-20 |
| ES2003477A6 (en) | 1988-11-01 |
| FR2589508A1 (en) | 1987-05-07 |
| AU593302B2 (en) | 1990-02-08 |
| IT8609518A0 (en) | 1986-11-06 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKLA | Lapsed |