CA1087764A - Inflatable supports - Google Patents
Inflatable supportsInfo
- Publication number
- CA1087764A CA1087764A CA312,756A CA312756A CA1087764A CA 1087764 A CA1087764 A CA 1087764A CA 312756 A CA312756 A CA 312756A CA 1087764 A CA1087764 A CA 1087764A
- Authority
- CA
- Canada
- Prior art keywords
- layer
- inflatable
- air
- upper layer
- tubes
- 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
Links
Abstract
ABSTRACT
A ripple bed has an upper and a lower inflatable layer. The upper layer has separate air passages which are independently inflatable and deflatable to provide the rippling effect. The lower layer is separately inflatable to provide support over any area of the upper layer which is deflated.
A ripple bed has an upper and a lower inflatable layer. The upper layer has separate air passages which are independently inflatable and deflatable to provide the rippling effect. The lower layer is separately inflatable to provide support over any area of the upper layer which is deflated.
Description
1(~877~;4 FIELD OF THE INVENTION
This in~ention relates to inflatable supports, such as air mattresses, and especially ripple beds.
BAC~GRO~D TO THE INVENTION
In a ripple bed, air is supplied under pressure to two separate air passages in an inflatable mattress. m e passages take the ~orm of a series of parallel tubes supplied from common header tubes, one for each passage, located on opposite sides of the mattress. Alternate transverse tubes go to one header tube, and the intervening transverse tube goes to the other header tube. The two passages are inflated and deflated cyclicly, the cycles of th¢ two passages being out of phase so that as one is beLng inflated the other is being deflated. This creates a ripple effect on the surface of the bed, which has been - found particularly useful in helping to prevent bedsores in bed-ridden patients. Leakage of air from the top surface may also be provided ~o assist in cooling the patient and evaporating moisture. Air beds of this type are for example disclosed in U.S. Specifications Nos. 2998817 and 3653083 and U.K. Specification No. 949652.
S~IARY OF THE I~VENTION
The present invention provides an inflatable sup-port for a patient comprising an upper and a lower infla-table layer, the upper layer having a plurality of separate air passages which are independently inflatable and de-flatable and are distributed over the area of the layer as a series of tubes such that the tubes of different passages are juxtapoxed, and a lower separately inflatable layer below the upper layer for continuous inflation so 10~ 4 that substantially the entire upper layer is continuously supported by the lower layer in use, the upper surface of the upper inflatable layer being of air permeable material or provided with air bleed apertures whereby escaping air can issue directly over the body of a patient resting on the upper surface. The function of the lower inflatable `
layer is particularly important during the changeover perioa when one set of tubes is deflating and the other set has not yet been fully inflated~ The lower infla-table layer also provides a soft support to the upperlayer which has been found to be a desirable feature.
The upper inflatable layer preferably takes the form of a series of transverse tubes supplied by common header tubes, one for each passage, located at the sides of the support, alternate transverse tubes communicating with one header tube, and intervening transverse tubes communicating with the other header tube. Preferably air bleed apertures are arranged non-uniformly over the surface to provide air bleeding from selected areas of the surface. The lower inflatable layer may comprise a single inflatable envelope, or alternatively it may be divided by partitions into a number of separately inflatable compartments.
Inflation equipment may also be included with the air bed, comprising a source of compressed gas, suitably air (and referred to herein generally as air), supplying separate conduits to the lower and upper inflatable layers, the conduit to the upper layer branching to the separate inlets of the different passages in the upper layer, and switching device being provided to cyclicly switch the air ~771;4 supply between the branches. The compressed air supply is preferably provided by a motor driven compressor. The switching device preferably includes means for varying the cycle length. The switching device may comprise a motor driven valve. The motor speed of the valve or compressor is preferably variable so that the air pressure to the support, both the upper and lower layers, can be varied to suit different weights of body supported thereby, and in the case of a variable speed valve the ripple speed can also be varied.
BRIEF DESCRIPTION OF THE ~RAWINGS AMD
DESCRIPTION OF PREFERRED EMBODIMENTS
In order that the invention may be more clearly understood, one embodiment will now be described with reference to the drawings, wherein:
Fig. 1 shows a perspective cut-away view of part of ~ mattress of the invention, and indicates diagrammatically the arrangement of its inflation equipment, - Fig. 2 shows diagrammatically one form of timing valve for switching the air flow to alternate passages of the upper inflatable layer, Fig. 3 shows a cut-away portion of a modification to the construction of Fig. 1, Fig. 4 shows a perspective view of a motor-operated valve, and Fig. 5 shows the mating faces of the valve disc and valve body.
Referring to Fig. 1; the mattress ~s constructed ~rom flexible air-impermeable sheet material, and comprises an upper inflatable layer 10 and a lower inflatable layer 10~764 12. The lower inflatable layer is defined by lower and upper sheets 14,16 respectively, while the upper layer is formed from a top sheet 18 peripherally sealed to the sheet 16. The sheets 16,18 are also sealed together within the area defined by the peripheral seal, to provide two lateral tubes 20,22 respec*ively running down opposite sides of the mattress, and a series of transverse tubes extending between the lateral tubes. The transverse tubes are in two , sets 24,26 respectively, the tubes 24 communicating with the lateral tube 20 at one side of the mattress, while the tubes 26 communicate w~th the lateral tube 22 at the opposite side of the mattress. There are thus defined two separate air passages in the upper inflatable layer between the sheets 16,18, one passage comprising the lateral tube 20 and transverse tubes 24, and the other passage comprising the lateral tubes 22 and the transverse tubes 26. Some at least of the transverse tubes are provided with very small apertures 28, which provide a control`led leak of air from the upper inflatable layer. The lower inflatable layer is provided with an air inlet 30 at a suitable point. If the layer 12 should be constructed to provide a number of separate compartments instead of a single inflatable envelope, then it can be provided with a corresponding number of air inlets. The two air passages of the upper inflatable layer are provided with separate air inlets 32,34 respectively leading into the lateral tubes.
Flexible elongate members 36, such as p.v.c. tubing,may be provided so as to extend along the lateral tubes 20,22 to ensure that they are kept open to the passage of air.
For ease of manufacture each inflatable layer could ~087764 be formed of two separate sheets, as shown in Fig. 3, thus employing a total of four sheets of material. The sheet 16 is thus replaced by two sheets 1~,17, the sheet 15 being sealed to the sheet 14 to form the lower inflatable layer and the sheet 17 sealed to the sheet 1~ to form the upper inflatable layer. These two intermediate sheets may be interconnected so as to locate the upper layer on the lower layer. However the upper layer may be detachable from the lower layer so that either can be used separately.
The mattress is supplied with compressed air from an electrically driven compressor 38. The compressor preferably has a variable output, suitably by using a variable speed drive motor, so that the air pressure to the mattress can be adjusted to suit different weights of b~ y supported thereon. The outlet from the pump branches, one branch 40 going directly or via a pressure reduction valve, to the inlet of the lower inflatable layer. The other branch 4~ leads to a cyclic switch-over valve 46, from which it emerges as further branches 42,44 going to the inlets 32,34 respectively of the two air passages of the upper inflatable layer.
In operation, the lower inflatable layer is kept inflated to the outlet pressure of the compressor (although this could be reduced by a suitable valve or controlled leak if desired). The air from the compressor is supplied to the upper inflatable layer through first one air passage then the other on an endlessly cyclical basis, for example with each passage being inflated for a period of twenty seconds before switching to the other passage. This switching of the air supply back and forth between the branches 42,44 is effected by the switch-over device 46 which incorporates a timer which periodically switches the valve back and forth. The timer may be of any suitable type. For example, the valve may be cyclicly operated by an electric motor, preferably a variable speed motor so that the cycle frequency can be altered. Electric motors with electronic speed controls are known in the art.
Alternatively the switching may be effected electrically by a solenoid or the like at intervals controlled by an electronic timing device of known kind. Another arrangement uses a fluidic astable device such as is shown in Fig. 2.
Referring to Fig. 2, the fluidic astable device, which is a device known in the fluidics art, comprises an air inlet passage 54 which branches to two air outlet passages 56,58, the passages being arranged in the form of a Y. Inlet pnssage 54 is connected to the conduit 41 from the compressor 38, while the outlet passages 56,58 are connected to the branch conduits 42,44 respectively. From the outlet passages 56,58 extend two air bleed tubes 60,62 respectively, each of which leads to a variable throttle valve 64 and air chamber 66 in series (although they could be in parallel). From the air chambers 66 extend respective air tubes 68,70 which open into the opposite sides of the inlet passage 54 at the junction with the passages 56,58. In operation, air supplied through the inlet passage 54 can be de*lected into one or other of the passages 56,58, by a certain minimum rate of air flowing from the opposite tube 68 or 70. Once air is flowing through one of the outlet passages it will continue to do lQ~ 4 so until it is flipped over into the other outlet passage by the application of a minimum rate of air issuing from the other tube 70 or 68. The air for the tubes 70,68 is obtained ~rom the bleed tubes 60,62 respectively, so that air passing through one of the outlet passages will provide the air bleed necessary to switch the air flow over to the other passage. The switching process thus cycles automatically, the cycle period being determined by the resistance-capacitance of the throttle 64 and chamber 66 in each air bleed passage. The throttle valves 64 are variable so that the cycle times can be adjusted as desired. Additionally or alternatively the chambers 66 could be adjustable. This type of switching device is simple to construct, and has essentially no moving parts.
An example of a motor operated val~e for alternating the supply of air is shown in Figs. 4 and 5. An electric motor 72 operates through a step-down gear box 74 to rotate a valve disc 76 which-is in sliding contact with a face 78 of a valve body 80 which is fixed to the gear box housing.
The valve body has radial inlet ports 81,82,84 for connection to the branches 41, 42 and 44 respectively. The inlet port 81 connects through a passage 85 with a central chamber 86 which is open on the face 78 of the valve body.
The ports 82,84 connect through respective passages 87,88 with respective diametrically opposed openings 89,90 in the face 78. In its face 91 which contacts the face 78, the valve disc 76 has a semi-annular channel 92 which registers with the openings 89,90, and a radial channel 93 which connects the channel 92 with the chamber 86 in the valve body. Thus, on rotation of the disc 76, air ~087764 supplied to the chamber 86 passes via the channels 93,92 to the openings 89 and 90 alternately. The disc speed is varied by varying the motor speed (although a varisble speed gear box could be used instead). ~or example, with motor speed varying from 60 to 600 rpm and an appropriate speed reduction in the gear box, a ripple period (i.e. the period from maximum inflation of one set of tubes to maximum inflation of the other set of tubes) of from about seven seconds to about seventy seconds can be obtained.
When the air supply is switched to one of the passages of the upper inflatable layer, the lateral and transverse tubes of that air passage inflateto support a body lying on the mattress. The lateral and transverse tubes of the other passage, now that there is no longer the air supply to that passage, gradually deflate through the loss of air thr~ugh the apertures 28. This alternate inflation and deflation of the two sets of transverse tubes produces a rippling effect, and prevents continuous pressure being applied to any one part of the body supported on the mattress. Because the lower inflatable layer remains inflated throughout, it will act to support a body on the mattress in the area of either of the air passages of the upper inflatable layer, if that layer should deflate to such an extent that sheet 18 bears on the sheet 16. A variable pressure reduction valve 45 can be provided in the branch 40 to enable the firmness of the underlying support to be varied independently of the support provided by the upper layer.
Although the invention has been particularly described in relation to a mattress, it could be applied to other inflatable supports, such as seat cushions. The switch-over valve device may be capable of being placed in a condition in which both air passages of the upper layer are simultaneously inflated. This may be useful, for example, in making a bed or mo~ing or treating a patient on the bed.
This in~ention relates to inflatable supports, such as air mattresses, and especially ripple beds.
BAC~GRO~D TO THE INVENTION
In a ripple bed, air is supplied under pressure to two separate air passages in an inflatable mattress. m e passages take the ~orm of a series of parallel tubes supplied from common header tubes, one for each passage, located on opposite sides of the mattress. Alternate transverse tubes go to one header tube, and the intervening transverse tube goes to the other header tube. The two passages are inflated and deflated cyclicly, the cycles of th¢ two passages being out of phase so that as one is beLng inflated the other is being deflated. This creates a ripple effect on the surface of the bed, which has been - found particularly useful in helping to prevent bedsores in bed-ridden patients. Leakage of air from the top surface may also be provided ~o assist in cooling the patient and evaporating moisture. Air beds of this type are for example disclosed in U.S. Specifications Nos. 2998817 and 3653083 and U.K. Specification No. 949652.
S~IARY OF THE I~VENTION
The present invention provides an inflatable sup-port for a patient comprising an upper and a lower infla-table layer, the upper layer having a plurality of separate air passages which are independently inflatable and de-flatable and are distributed over the area of the layer as a series of tubes such that the tubes of different passages are juxtapoxed, and a lower separately inflatable layer below the upper layer for continuous inflation so 10~ 4 that substantially the entire upper layer is continuously supported by the lower layer in use, the upper surface of the upper inflatable layer being of air permeable material or provided with air bleed apertures whereby escaping air can issue directly over the body of a patient resting on the upper surface. The function of the lower inflatable `
layer is particularly important during the changeover perioa when one set of tubes is deflating and the other set has not yet been fully inflated~ The lower infla-table layer also provides a soft support to the upperlayer which has been found to be a desirable feature.
The upper inflatable layer preferably takes the form of a series of transverse tubes supplied by common header tubes, one for each passage, located at the sides of the support, alternate transverse tubes communicating with one header tube, and intervening transverse tubes communicating with the other header tube. Preferably air bleed apertures are arranged non-uniformly over the surface to provide air bleeding from selected areas of the surface. The lower inflatable layer may comprise a single inflatable envelope, or alternatively it may be divided by partitions into a number of separately inflatable compartments.
Inflation equipment may also be included with the air bed, comprising a source of compressed gas, suitably air (and referred to herein generally as air), supplying separate conduits to the lower and upper inflatable layers, the conduit to the upper layer branching to the separate inlets of the different passages in the upper layer, and switching device being provided to cyclicly switch the air ~771;4 supply between the branches. The compressed air supply is preferably provided by a motor driven compressor. The switching device preferably includes means for varying the cycle length. The switching device may comprise a motor driven valve. The motor speed of the valve or compressor is preferably variable so that the air pressure to the support, both the upper and lower layers, can be varied to suit different weights of body supported thereby, and in the case of a variable speed valve the ripple speed can also be varied.
BRIEF DESCRIPTION OF THE ~RAWINGS AMD
DESCRIPTION OF PREFERRED EMBODIMENTS
In order that the invention may be more clearly understood, one embodiment will now be described with reference to the drawings, wherein:
Fig. 1 shows a perspective cut-away view of part of ~ mattress of the invention, and indicates diagrammatically the arrangement of its inflation equipment, - Fig. 2 shows diagrammatically one form of timing valve for switching the air flow to alternate passages of the upper inflatable layer, Fig. 3 shows a cut-away portion of a modification to the construction of Fig. 1, Fig. 4 shows a perspective view of a motor-operated valve, and Fig. 5 shows the mating faces of the valve disc and valve body.
Referring to Fig. 1; the mattress ~s constructed ~rom flexible air-impermeable sheet material, and comprises an upper inflatable layer 10 and a lower inflatable layer 10~764 12. The lower inflatable layer is defined by lower and upper sheets 14,16 respectively, while the upper layer is formed from a top sheet 18 peripherally sealed to the sheet 16. The sheets 16,18 are also sealed together within the area defined by the peripheral seal, to provide two lateral tubes 20,22 respec*ively running down opposite sides of the mattress, and a series of transverse tubes extending between the lateral tubes. The transverse tubes are in two , sets 24,26 respectively, the tubes 24 communicating with the lateral tube 20 at one side of the mattress, while the tubes 26 communicate w~th the lateral tube 22 at the opposite side of the mattress. There are thus defined two separate air passages in the upper inflatable layer between the sheets 16,18, one passage comprising the lateral tube 20 and transverse tubes 24, and the other passage comprising the lateral tubes 22 and the transverse tubes 26. Some at least of the transverse tubes are provided with very small apertures 28, which provide a control`led leak of air from the upper inflatable layer. The lower inflatable layer is provided with an air inlet 30 at a suitable point. If the layer 12 should be constructed to provide a number of separate compartments instead of a single inflatable envelope, then it can be provided with a corresponding number of air inlets. The two air passages of the upper inflatable layer are provided with separate air inlets 32,34 respectively leading into the lateral tubes.
Flexible elongate members 36, such as p.v.c. tubing,may be provided so as to extend along the lateral tubes 20,22 to ensure that they are kept open to the passage of air.
For ease of manufacture each inflatable layer could ~087764 be formed of two separate sheets, as shown in Fig. 3, thus employing a total of four sheets of material. The sheet 16 is thus replaced by two sheets 1~,17, the sheet 15 being sealed to the sheet 14 to form the lower inflatable layer and the sheet 17 sealed to the sheet 1~ to form the upper inflatable layer. These two intermediate sheets may be interconnected so as to locate the upper layer on the lower layer. However the upper layer may be detachable from the lower layer so that either can be used separately.
The mattress is supplied with compressed air from an electrically driven compressor 38. The compressor preferably has a variable output, suitably by using a variable speed drive motor, so that the air pressure to the mattress can be adjusted to suit different weights of b~ y supported thereon. The outlet from the pump branches, one branch 40 going directly or via a pressure reduction valve, to the inlet of the lower inflatable layer. The other branch 4~ leads to a cyclic switch-over valve 46, from which it emerges as further branches 42,44 going to the inlets 32,34 respectively of the two air passages of the upper inflatable layer.
In operation, the lower inflatable layer is kept inflated to the outlet pressure of the compressor (although this could be reduced by a suitable valve or controlled leak if desired). The air from the compressor is supplied to the upper inflatable layer through first one air passage then the other on an endlessly cyclical basis, for example with each passage being inflated for a period of twenty seconds before switching to the other passage. This switching of the air supply back and forth between the branches 42,44 is effected by the switch-over device 46 which incorporates a timer which periodically switches the valve back and forth. The timer may be of any suitable type. For example, the valve may be cyclicly operated by an electric motor, preferably a variable speed motor so that the cycle frequency can be altered. Electric motors with electronic speed controls are known in the art.
Alternatively the switching may be effected electrically by a solenoid or the like at intervals controlled by an electronic timing device of known kind. Another arrangement uses a fluidic astable device such as is shown in Fig. 2.
Referring to Fig. 2, the fluidic astable device, which is a device known in the fluidics art, comprises an air inlet passage 54 which branches to two air outlet passages 56,58, the passages being arranged in the form of a Y. Inlet pnssage 54 is connected to the conduit 41 from the compressor 38, while the outlet passages 56,58 are connected to the branch conduits 42,44 respectively. From the outlet passages 56,58 extend two air bleed tubes 60,62 respectively, each of which leads to a variable throttle valve 64 and air chamber 66 in series (although they could be in parallel). From the air chambers 66 extend respective air tubes 68,70 which open into the opposite sides of the inlet passage 54 at the junction with the passages 56,58. In operation, air supplied through the inlet passage 54 can be de*lected into one or other of the passages 56,58, by a certain minimum rate of air flowing from the opposite tube 68 or 70. Once air is flowing through one of the outlet passages it will continue to do lQ~ 4 so until it is flipped over into the other outlet passage by the application of a minimum rate of air issuing from the other tube 70 or 68. The air for the tubes 70,68 is obtained ~rom the bleed tubes 60,62 respectively, so that air passing through one of the outlet passages will provide the air bleed necessary to switch the air flow over to the other passage. The switching process thus cycles automatically, the cycle period being determined by the resistance-capacitance of the throttle 64 and chamber 66 in each air bleed passage. The throttle valves 64 are variable so that the cycle times can be adjusted as desired. Additionally or alternatively the chambers 66 could be adjustable. This type of switching device is simple to construct, and has essentially no moving parts.
An example of a motor operated val~e for alternating the supply of air is shown in Figs. 4 and 5. An electric motor 72 operates through a step-down gear box 74 to rotate a valve disc 76 which-is in sliding contact with a face 78 of a valve body 80 which is fixed to the gear box housing.
The valve body has radial inlet ports 81,82,84 for connection to the branches 41, 42 and 44 respectively. The inlet port 81 connects through a passage 85 with a central chamber 86 which is open on the face 78 of the valve body.
The ports 82,84 connect through respective passages 87,88 with respective diametrically opposed openings 89,90 in the face 78. In its face 91 which contacts the face 78, the valve disc 76 has a semi-annular channel 92 which registers with the openings 89,90, and a radial channel 93 which connects the channel 92 with the chamber 86 in the valve body. Thus, on rotation of the disc 76, air ~087764 supplied to the chamber 86 passes via the channels 93,92 to the openings 89 and 90 alternately. The disc speed is varied by varying the motor speed (although a varisble speed gear box could be used instead). ~or example, with motor speed varying from 60 to 600 rpm and an appropriate speed reduction in the gear box, a ripple period (i.e. the period from maximum inflation of one set of tubes to maximum inflation of the other set of tubes) of from about seven seconds to about seventy seconds can be obtained.
When the air supply is switched to one of the passages of the upper inflatable layer, the lateral and transverse tubes of that air passage inflateto support a body lying on the mattress. The lateral and transverse tubes of the other passage, now that there is no longer the air supply to that passage, gradually deflate through the loss of air thr~ugh the apertures 28. This alternate inflation and deflation of the two sets of transverse tubes produces a rippling effect, and prevents continuous pressure being applied to any one part of the body supported on the mattress. Because the lower inflatable layer remains inflated throughout, it will act to support a body on the mattress in the area of either of the air passages of the upper inflatable layer, if that layer should deflate to such an extent that sheet 18 bears on the sheet 16. A variable pressure reduction valve 45 can be provided in the branch 40 to enable the firmness of the underlying support to be varied independently of the support provided by the upper layer.
Although the invention has been particularly described in relation to a mattress, it could be applied to other inflatable supports, such as seat cushions. The switch-over valve device may be capable of being placed in a condition in which both air passages of the upper layer are simultaneously inflated. This may be useful, for example, in making a bed or mo~ing or treating a patient on the bed.
Claims (9)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. An inflatable support for a patient comprising an upper and a lower inflatable layer, the upper layer having a plurality of separate air passages which are independently inflatable and deflatable and are distributed over the area of the layer as a series of tubes such that the tubes of different passages are juxtaposed, and a lower separately inflatable layer below the upper layer for continuous inflation so that substantially the entire upper layer is continuously supported by the lower layer in use, the upper surface of the upper inflatable layer being of air permeable material or provided with air bleed apertures whereby escaping air can issue directly over the body of a patient resting on the upper surface.
2. An inflatable support according to claim 1 wherein the upper inflatable layer takes the form of a series of transverse tubes supplied by common header tubes, one for each passage, located at the sides of the support, alternate transverse tubes communicating with one header tube, and intervening transverse tubes communicating with the other header tube,
3. An inflatable support according to claim 1 comprising a source of compressed air supplying the upper layer through a conduit which branches to the separate inlets of the different passages in the upper layer, and a switching device to cyclicly switch the air supply from one branch to the other, wherein deflation of a passage is effected by cutting off the air supply to that passage
4. An inflatable support according to claim 1 wherein the air bleed apertures are provided arranged non-uniformly over the surface to provide air bleeding from selected areas of the surface.
5. An inflatable support according to claim 1 including inflation equipment comprising a source of compressed air supplying separate conduits to the lower and upper inflatable layers, the conduit to the upper layer branching to the separate inlets of the different passages in the upper layer, and a switching device being provided to cyclicly switch the air supply from one branch to the other.
6. An inflatable support according to claim 1 comprising a source of compressed air supplying the upper layer through a conduit which branches to the separate inlets of the different passages in the upper layer, and a switching device to cyclicly switch the air supply from one branch to the other, the switching device including means to vary the cycle length,
7. An inflatable support according to claim 1 comprising a source of compressed air supplying the upper layer through a conduit which branches to the separate inlets of the different passages in the upper layer, and a switching device to cyclicly switch the air supply from one branch to the other, the switching device comprising a motor driven valve,
8. An inflatable support according to claim 7 wherein said motor speed is variable so as to vary the cycle frequency.
9. An inflatable support according to claim 5 wherein a variable pressure reduction valve is supplied in the conduit to the lower layer to enable the firmness of the underlying layer to be varied independently of the support provided by the upper layer.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA312,756A CA1087764A (en) | 1978-10-05 | 1978-10-05 | Inflatable supports |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA312,756A CA1087764A (en) | 1978-10-05 | 1978-10-05 | Inflatable supports |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1087764A true CA1087764A (en) | 1980-10-14 |
Family
ID=4112534
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA312,756A Expired CA1087764A (en) | 1978-10-05 | 1978-10-05 | Inflatable supports |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA1087764A (en) |
-
1978
- 1978-10-05 CA CA312,756A patent/CA1087764A/en not_active Expired
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |