CA2216493C - Valve position indicator - Google Patents
Valve position indicator Download PDFInfo
- Publication number
- CA2216493C CA2216493C CA 2216493 CA2216493A CA2216493C CA 2216493 C CA2216493 C CA 2216493C CA 2216493 CA2216493 CA 2216493 CA 2216493 A CA2216493 A CA 2216493A CA 2216493 C CA2216493 C CA 2216493C
- Authority
- CA
- Canada
- Prior art keywords
- shell form
- form body
- rotational position
- colour indicia
- colour
- 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
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Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K37/00—Special means in or on valves or other cut-off apparatus for indicating or recording operation thereof, or for enabling an alarm to be given
- F16K37/0058—Optical means, e.g. light transmission, observation ports
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Indication Of The Valve Opening Or Closing Status (AREA)
Abstract
A valve position indicator includes a first shell form body and a second shell form body. The first body has an exterior surface marked with a first colour indicia and a second colour indicia. A rotatable valve actuator knob is non-rotatably secured to the first body. The second body overlies the first body and has viewing windows. Rotation of the second body is limited relative to the first body to a closed rotational position in which the first colour indicia is visible through the viewing windows and an open rotational position in which the second colour indicia is visible through the viewing windows. The second body is locked in the open rotational position until a preset locking tension is overcome.
Description
' CA 02216493 1997-09-2 TITLE OF THE lNV~NLlON:
valve position indicator NAMES OF lNV~N-LORS:
Magella Joseph Alberic Jacques Boucher FIELD OF THE lNV~NLlON
The present invention relates to a valve position indicator and, in particular, a valve position indicator which can readily be retrofit onto an existing valve to provide colour indicia as to valve positioning.
BACKGROUND OF THE lNV~NLlON
United States Patent 4,448,148 which was issued to Gain in 1984 discloses a valve position indicator. This valve position indicator has windows. When the valve is in an open position colour indicia is visible through the windows to provide a indication of valve position readily discernable even from a distance. United States Patent 4,116,157 which was issued to Evans in 1978 discloses a visual indicating device with contrasting red and green colours. The device has a cover plate and an indicator plate. The indicator plate is divided into a plurality of pie shaped segments which alternate red and green in colour. The cover plate is divided into a plurality of pie shaped transparent viewing window segments separated by an opaque white segments. When the indicator plate is in a first rotational position, only the green segments are visible through the transparent viewing window segments as the red segments are hidden by the opaque white segments. In a second rotational position, only the red segments are visible through the transparent viewing window segments as the green segments CA 02216493 1997-09-2~
are hidden by the opaque white segments. The Gain and Evans references are merely examples of many valve position indicators which differ in their mechanical structure, but are conceptually similar.
Valve position indicators, as described, perform a vital safety function. In many environments it is critical to worker safety or environmental protection that valve position be readily and accurately ascertained. The majority of valves are manufactured without any integral valve position indicator.
There are millions of valves for which a simple retrofit valve position indicator would be beneficial, for industrial uses, residential uses and recreational uses.
SUMMARY OF THE LNv~NLlON
What is required is a valve position indicator which can readily be retrofit onto an existing valve.
According to the present invention there is provided a valve position indicator which includes a first body and a second body. The first body has an exterior surface marked with a first colour indicia and a second colour indicia. The second body has an interior cavity and a plurality of viewing windows. The second body overlies the first body. Means is provided for non-rotatably securing a rotatable valve actuator knob to one of the first shell form body and the second shell form body, such that one of the first shell form body and the second shell form body rotates with the rotatable valve actuator knob. Stop means is provided for limiting relative rotation of first body and the second body to a closed rotational position in which the first colour indicia is visible through the viewing windows and an open rotational position in which the second colour indicia is visible through the viewing windows. Lock means is provided for maintaining the open rotational position until a preset locking tension is overcome.
. CA 02216493 1997-09-2~
The valve position indicator, as described above, is secured over a rotatable valve actuator knob with the closed rotational position being a shut off position. When the valve actuator knob is rotated to open the valve, the valve indicator assumes the open rotational position. The lock means maintains the valve indicator in the open rotational position regardless of the extent to which the valve is opened. In order to shut the valve off, a sufficient force must be exerted upon the valve position indicator to override the lock means maintaining the valve position indicator in the open rotational position.
Viewing the valve position indicator in the closed rotational position, therefore, is a reliable indication that the valve is shut off. The colour indicia enables a person to determine from a distance whether the valve position indicator is in the closed rotational position or the open rotational position.
BRIEF DESCRIPTION OF THE DRAWINGS
These and other features of the invention will become more apparent from the following description in which reference is made to the appended drawings, wherein:
FIGURE 1 is an exploded side elevation view of a valve position indicator constructed in accordance with the teachings of the present invention.
FIGURE 2 is a bottom plan view of a first body of the valve position indicator illustrated in FIGURE 1.
FIGURE 3 is a top plan view of a first body of the valve position indicator illustrated in FIGURE 1.
FIGURE 4 is a bottom plan view of a second body of the valve position indicator illustrated in FIGURE 1.
The preferred embodiment, a valve position indicator CA 02216493 1997-09-2~
generally identified by reference numeral 10, will now be described with reference to FIGURES 1 through 4.
Referring to FIGURE 1, valve position indicator 10 includes a first shell form body 12 and a second shell form body 14. First body 12 has a top 16 and a peripheral sidewall 18 defining an interior cavity 20 and an exterior surface 22.
Exterior surface 22 at peripheral sidewall 18 is marked with a first colour indicia 24 and a second colour indicia 26.
Referring to FIGURE 3, on this embodiment exterior surface 22 at top 16 is also marked with first colour indicia 24 and second colour indicia 26. Referring to FIGURE 1, an upright pin member 28 extends substantially vertically from top 16.
Top 16 of the first body 12 has at least one hole 30 in which is received a protruding spherical locking member 32 mounted on a spring 34. Referring to FIGURE 2, a plurality of set screws 36 extend through peripheral sidewall 18 of first body 12 and serve as means to non-rotatably clamp a rotatable valve actuator knob 38 within interior cavity 20 of first body 12, such that first body 12 rotates with rotatable valve actuator knob 38. Referring to FIGURE 1, the second body 14 has a top 40 and peripheral sidewall 42 defining an interior cavity 44.
A plurality of viewing windows 46 extending through peripheral sidewall 42 of second body 14. Second body 14 overlies first body 12 and is co-axially rotatably secured to first body 12 by means of a screw 48. When second body 14 overlies first body 12 either first colour indicia 24 or second colour indicia 26 are visible through viewing windows 46. Referring to FIGURE
4, this embodiment also has a plurality of viewing windows 50 extending through top 40. When second body 14 overlies first body 12 either first colour indicia 24 or second colour indicia 26 are visible through viewing windows 50. Second body 14 has at least one arcuate slot 52 through top 40. Second body 14 has at least one shallow pocket 54 extending from interior cavity 44 into top 40. Upright pin member 28 on top 16 of first body 12 extends through arcuate slot 52 in second body 14, thereby limiting relative rotation of second body 14 CA 022l6493 l997-09-2~
relative to first body 12 by the extent of travel of upright member 28 in slot 52. Referring to FIGURE 1, second body 14 has a closed rotational position in which upright member 28 is at a first end 56 of slot 52 and an open rotational position in which upright member 28 is at second end 58 of slot 52.
First colour indicia 24 is visible through both viewing windows 46 and 50 in the closed rotational position and second colour indicia 26 is visible through both viewing windows 46 and 50 in the open rotational position. In the open rotational position the spherical locking member 32 of first body 12 biased by springs 34 engage the shallow pocket 54 in second body 14.
The use and operation of valve position indicator 10 will now be described with reference to FIGURES 1 through 4. For the purpose of the description, colour indicia 24 is the colour silver indicating the closed rotational position and colour indicia 26 is the colour red indicating the open rotational position. Referring to FIGURE 2, rotatable valve actuator knob 38 is positioned within interior cavity 20 of first body 12 and secured in position with set screws 36. It is preferred that valve actuator knob 38 be in a shut off position and that valve position indicator be in the closed rotational position. In order to rotate valve actuator knob 38 to an open position, second body 14 of valve position indicator 10 is grasped and turned. Second body 14 will initially rotate relative to first body 12 to the open rotational position. At the open rotational position, further rotation of second body 14 relative to first body 12 is stopped by upright pin member 28 reaching second end 58 of slot 52. Further rotation of second body 14 thereafter serves to rotate first body 12, which results in the rotation of valve actuator knob 38 to an open position due to the fact that valve actuator knob 38 and first body 12 are non-rotatably coupled. Second body 14 of valve position indicator 10 is maintained in the open rotational position by spherical locking member 32 engaging pocket 54. This open rotational position is maintained regardless of the extent to which valve actuator CA 02216493 1997-09-2~
knob 38 is turned to an open position. In order to return valve actuator knob 38 to a shut off position, a sufficient force must be exerted upon second body 14 of valve position indicator 10 to override the biasing force of springs 34 which maintain spherical locking member 32 in engagement with pocket 54. Viewing the colour silver (colour indicia 24) through windows 46 or 50 is, therefore, a reliable indication that valve position indicator in the closed rotational position and valve actuator knob 38 is shut off. Conversely, viewing the colour red (colour indicia 26) through windows 46 or 50 is a reliable indication that valve position indicator in the open rotational position with valve actuator knob 38 is open to some degree.
It will be apparent to one skilled in the art that modifications may be made to the illustrated embodiment without departing from the spirit and scope of the invention as hereinafter defined in the Claims.
valve position indicator NAMES OF lNV~N-LORS:
Magella Joseph Alberic Jacques Boucher FIELD OF THE lNV~NLlON
The present invention relates to a valve position indicator and, in particular, a valve position indicator which can readily be retrofit onto an existing valve to provide colour indicia as to valve positioning.
BACKGROUND OF THE lNV~NLlON
United States Patent 4,448,148 which was issued to Gain in 1984 discloses a valve position indicator. This valve position indicator has windows. When the valve is in an open position colour indicia is visible through the windows to provide a indication of valve position readily discernable even from a distance. United States Patent 4,116,157 which was issued to Evans in 1978 discloses a visual indicating device with contrasting red and green colours. The device has a cover plate and an indicator plate. The indicator plate is divided into a plurality of pie shaped segments which alternate red and green in colour. The cover plate is divided into a plurality of pie shaped transparent viewing window segments separated by an opaque white segments. When the indicator plate is in a first rotational position, only the green segments are visible through the transparent viewing window segments as the red segments are hidden by the opaque white segments. In a second rotational position, only the red segments are visible through the transparent viewing window segments as the green segments CA 02216493 1997-09-2~
are hidden by the opaque white segments. The Gain and Evans references are merely examples of many valve position indicators which differ in their mechanical structure, but are conceptually similar.
Valve position indicators, as described, perform a vital safety function. In many environments it is critical to worker safety or environmental protection that valve position be readily and accurately ascertained. The majority of valves are manufactured without any integral valve position indicator.
There are millions of valves for which a simple retrofit valve position indicator would be beneficial, for industrial uses, residential uses and recreational uses.
SUMMARY OF THE LNv~NLlON
What is required is a valve position indicator which can readily be retrofit onto an existing valve.
According to the present invention there is provided a valve position indicator which includes a first body and a second body. The first body has an exterior surface marked with a first colour indicia and a second colour indicia. The second body has an interior cavity and a plurality of viewing windows. The second body overlies the first body. Means is provided for non-rotatably securing a rotatable valve actuator knob to one of the first shell form body and the second shell form body, such that one of the first shell form body and the second shell form body rotates with the rotatable valve actuator knob. Stop means is provided for limiting relative rotation of first body and the second body to a closed rotational position in which the first colour indicia is visible through the viewing windows and an open rotational position in which the second colour indicia is visible through the viewing windows. Lock means is provided for maintaining the open rotational position until a preset locking tension is overcome.
. CA 02216493 1997-09-2~
The valve position indicator, as described above, is secured over a rotatable valve actuator knob with the closed rotational position being a shut off position. When the valve actuator knob is rotated to open the valve, the valve indicator assumes the open rotational position. The lock means maintains the valve indicator in the open rotational position regardless of the extent to which the valve is opened. In order to shut the valve off, a sufficient force must be exerted upon the valve position indicator to override the lock means maintaining the valve position indicator in the open rotational position.
Viewing the valve position indicator in the closed rotational position, therefore, is a reliable indication that the valve is shut off. The colour indicia enables a person to determine from a distance whether the valve position indicator is in the closed rotational position or the open rotational position.
BRIEF DESCRIPTION OF THE DRAWINGS
These and other features of the invention will become more apparent from the following description in which reference is made to the appended drawings, wherein:
FIGURE 1 is an exploded side elevation view of a valve position indicator constructed in accordance with the teachings of the present invention.
FIGURE 2 is a bottom plan view of a first body of the valve position indicator illustrated in FIGURE 1.
FIGURE 3 is a top plan view of a first body of the valve position indicator illustrated in FIGURE 1.
FIGURE 4 is a bottom plan view of a second body of the valve position indicator illustrated in FIGURE 1.
The preferred embodiment, a valve position indicator CA 02216493 1997-09-2~
generally identified by reference numeral 10, will now be described with reference to FIGURES 1 through 4.
Referring to FIGURE 1, valve position indicator 10 includes a first shell form body 12 and a second shell form body 14. First body 12 has a top 16 and a peripheral sidewall 18 defining an interior cavity 20 and an exterior surface 22.
Exterior surface 22 at peripheral sidewall 18 is marked with a first colour indicia 24 and a second colour indicia 26.
Referring to FIGURE 3, on this embodiment exterior surface 22 at top 16 is also marked with first colour indicia 24 and second colour indicia 26. Referring to FIGURE 1, an upright pin member 28 extends substantially vertically from top 16.
Top 16 of the first body 12 has at least one hole 30 in which is received a protruding spherical locking member 32 mounted on a spring 34. Referring to FIGURE 2, a plurality of set screws 36 extend through peripheral sidewall 18 of first body 12 and serve as means to non-rotatably clamp a rotatable valve actuator knob 38 within interior cavity 20 of first body 12, such that first body 12 rotates with rotatable valve actuator knob 38. Referring to FIGURE 1, the second body 14 has a top 40 and peripheral sidewall 42 defining an interior cavity 44.
A plurality of viewing windows 46 extending through peripheral sidewall 42 of second body 14. Second body 14 overlies first body 12 and is co-axially rotatably secured to first body 12 by means of a screw 48. When second body 14 overlies first body 12 either first colour indicia 24 or second colour indicia 26 are visible through viewing windows 46. Referring to FIGURE
4, this embodiment also has a plurality of viewing windows 50 extending through top 40. When second body 14 overlies first body 12 either first colour indicia 24 or second colour indicia 26 are visible through viewing windows 50. Second body 14 has at least one arcuate slot 52 through top 40. Second body 14 has at least one shallow pocket 54 extending from interior cavity 44 into top 40. Upright pin member 28 on top 16 of first body 12 extends through arcuate slot 52 in second body 14, thereby limiting relative rotation of second body 14 CA 022l6493 l997-09-2~
relative to first body 12 by the extent of travel of upright member 28 in slot 52. Referring to FIGURE 1, second body 14 has a closed rotational position in which upright member 28 is at a first end 56 of slot 52 and an open rotational position in which upright member 28 is at second end 58 of slot 52.
First colour indicia 24 is visible through both viewing windows 46 and 50 in the closed rotational position and second colour indicia 26 is visible through both viewing windows 46 and 50 in the open rotational position. In the open rotational position the spherical locking member 32 of first body 12 biased by springs 34 engage the shallow pocket 54 in second body 14.
The use and operation of valve position indicator 10 will now be described with reference to FIGURES 1 through 4. For the purpose of the description, colour indicia 24 is the colour silver indicating the closed rotational position and colour indicia 26 is the colour red indicating the open rotational position. Referring to FIGURE 2, rotatable valve actuator knob 38 is positioned within interior cavity 20 of first body 12 and secured in position with set screws 36. It is preferred that valve actuator knob 38 be in a shut off position and that valve position indicator be in the closed rotational position. In order to rotate valve actuator knob 38 to an open position, second body 14 of valve position indicator 10 is grasped and turned. Second body 14 will initially rotate relative to first body 12 to the open rotational position. At the open rotational position, further rotation of second body 14 relative to first body 12 is stopped by upright pin member 28 reaching second end 58 of slot 52. Further rotation of second body 14 thereafter serves to rotate first body 12, which results in the rotation of valve actuator knob 38 to an open position due to the fact that valve actuator knob 38 and first body 12 are non-rotatably coupled. Second body 14 of valve position indicator 10 is maintained in the open rotational position by spherical locking member 32 engaging pocket 54. This open rotational position is maintained regardless of the extent to which valve actuator CA 02216493 1997-09-2~
knob 38 is turned to an open position. In order to return valve actuator knob 38 to a shut off position, a sufficient force must be exerted upon second body 14 of valve position indicator 10 to override the biasing force of springs 34 which maintain spherical locking member 32 in engagement with pocket 54. Viewing the colour silver (colour indicia 24) through windows 46 or 50 is, therefore, a reliable indication that valve position indicator in the closed rotational position and valve actuator knob 38 is shut off. Conversely, viewing the colour red (colour indicia 26) through windows 46 or 50 is a reliable indication that valve position indicator in the open rotational position with valve actuator knob 38 is open to some degree.
It will be apparent to one skilled in the art that modifications may be made to the illustrated embodiment without departing from the spirit and scope of the invention as hereinafter defined in the Claims.
Claims (8)
1. A valve position indicator, comprising:
a first body having an exterior surface marked with a first colour indicia and a second colour indicia;
a second body having an interior cavity and a plurality of viewing windows, the second shell form body overlying the first body;
means for non-rotatably securing a rotatable valve actuator knob to one of the first shell form body and the second shell form body, such that one of the first shell form body and the second shell form body rotates with the rotatable valve actuator knob;
stop means for limiting relative rotation of first body and the second body to a closed rotational position in which the first colour indicia is visible through the viewing windows and an open rotational position in which the second colour indicia is visible through the viewing windows; and lock means for maintaining the open rotational position until a preset locking tension is overcome.
a first body having an exterior surface marked with a first colour indicia and a second colour indicia;
a second body having an interior cavity and a plurality of viewing windows, the second shell form body overlying the first body;
means for non-rotatably securing a rotatable valve actuator knob to one of the first shell form body and the second shell form body, such that one of the first shell form body and the second shell form body rotates with the rotatable valve actuator knob;
stop means for limiting relative rotation of first body and the second body to a closed rotational position in which the first colour indicia is visible through the viewing windows and an open rotational position in which the second colour indicia is visible through the viewing windows; and lock means for maintaining the open rotational position until a preset locking tension is overcome.
2. The valve position indicator as defined in Claim 1, wherein the first body has an interior cavity and means is provided to clamp a rotatable valve actuator knob within the interior cavity of the first body.
3. The valve position indicator as defined in Claim 1, wherein the stop means includes a slot in the second body through which extends a member rigidly secured to the first body, whereby relative rotation is limited by the travel of the member in the slot.
4. The valve position indicator as defined in Claim 1, wherein the lock means include shallow pockets in the interior cavity of the second body and spring biased members that engage the pockets until a force is exerted that exceeds the compressive force of the spring.
5. The valve position indicator as defined in Claim 1, wherein the first body has a top and a peripheral sidewall, and the second body has a top and a peripheral sidewall.
6. The valve position indicator as defined in Claim 5, wherein the first colour indicia and the second colour indicia are on the exterior surface of the top of the first body and the viewing windows extend through the top of the second body.
7. The valve position indicator as defined in Claim 5, wherein the first colour indicia and the second colour indicia are on the exterior surface of the peripheral sidewall of the first body and the viewing windows extend through the peripheral sidewall of the second body.
8. A valve position indicator, comprising:
a first shell form body having a top and a peripheral sidewall defining an interior cavity and an exterior surface, the exterior surface of one of the top and the peripheral sidewall being marked with a first colour indicia and a second colour indicia, an upright member extending substantially vertically from the top of the first shell form body, the top of the first shell form body having at least one hole in which are received a protruding spherical locking member mounted on a spring;
a plurality of set screws extending through the peripheral sidewall of the first shell form body whereby a rotatable valve actuator knob is non-rotatably clamped within the interior cavity of the first shell form body, such that the first shell form body rotates with the rotatable valve actuator knob;
a second shell form body having a top and peripheral sidewall defining an interior cavity, a plurality of viewing windows extending through one of the top and the peripheral sidewall of the second shell form body, such that one of the first colour indicia and the second colour indicia is visible through the viewing windows, the second shell form body overlying and being co-axially rotatably secured to the first shell form body, the second shell form body having at least one arcuate slot through the top, the second shell form body having at least one shallow pocket extending from the interior cavity into the top;
the upright member on the top of the first shell form body extending through the arcuate slot in the second shell form body, thereby limiting relative rotation of the second shell form body relative to the first shell form body by the travel of the upright member in the slot, such that the second shell form body has a closed rotational position in which the upright member is at a first end of the slot and an open rotational position in which the upright member is at the second end of the slot, the first colour indicia being visible through the viewing windows in the closed rotational position and the second colour indicia being visible through the viewing windows in the open rotational position; and in the open rotational position the at least one spring biased spherical locking member in the first shell form body engages the at least one shallow pocket in the second shell form body, thereby maintaining the second shell form body in the open rotational position until a rotational force is exerted that exceeds the tension in the springs acting to maintain the at least one spherical locking member in engagement with the at least one shallow pocket.
a first shell form body having a top and a peripheral sidewall defining an interior cavity and an exterior surface, the exterior surface of one of the top and the peripheral sidewall being marked with a first colour indicia and a second colour indicia, an upright member extending substantially vertically from the top of the first shell form body, the top of the first shell form body having at least one hole in which are received a protruding spherical locking member mounted on a spring;
a plurality of set screws extending through the peripheral sidewall of the first shell form body whereby a rotatable valve actuator knob is non-rotatably clamped within the interior cavity of the first shell form body, such that the first shell form body rotates with the rotatable valve actuator knob;
a second shell form body having a top and peripheral sidewall defining an interior cavity, a plurality of viewing windows extending through one of the top and the peripheral sidewall of the second shell form body, such that one of the first colour indicia and the second colour indicia is visible through the viewing windows, the second shell form body overlying and being co-axially rotatably secured to the first shell form body, the second shell form body having at least one arcuate slot through the top, the second shell form body having at least one shallow pocket extending from the interior cavity into the top;
the upright member on the top of the first shell form body extending through the arcuate slot in the second shell form body, thereby limiting relative rotation of the second shell form body relative to the first shell form body by the travel of the upright member in the slot, such that the second shell form body has a closed rotational position in which the upright member is at a first end of the slot and an open rotational position in which the upright member is at the second end of the slot, the first colour indicia being visible through the viewing windows in the closed rotational position and the second colour indicia being visible through the viewing windows in the open rotational position; and in the open rotational position the at least one spring biased spherical locking member in the first shell form body engages the at least one shallow pocket in the second shell form body, thereby maintaining the second shell form body in the open rotational position until a rotational force is exerted that exceeds the tension in the springs acting to maintain the at least one spherical locking member in engagement with the at least one shallow pocket.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2216493 CA2216493C (en) | 1997-09-25 | 1997-09-25 | Valve position indicator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2216493 CA2216493C (en) | 1997-09-25 | 1997-09-25 | Valve position indicator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2216493A1 CA2216493A1 (en) | 1998-09-04 |
| CA2216493C true CA2216493C (en) | 1999-02-09 |
Family
ID=4161523
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2216493 Expired - Fee Related CA2216493C (en) | 1997-09-25 | 1997-09-25 | Valve position indicator |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2216493C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE19960590A1 (en) * | 1999-12-16 | 2001-07-05 | Messer Cutting & Welding Ag | Pin index bottle valve |
| DE102007019396A1 (en) * | 2007-04-23 | 2008-11-06 | Harald Klotsche | Valve with status display |
| SE539422C2 (en) * | 2015-10-08 | 2017-09-19 | Cyto365Ab | Medical valve |
-
1997
- 1997-09-25 CA CA 2216493 patent/CA2216493C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CA2216493A1 (en) | 1998-09-04 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |