PRESSURE CONTAINER, PARTICULARLY FOR FOOD, DRUGS, COSMETICS, PAINTS AND CHEMICAL PRODUCTS

Abstract: Pressure container comprising protective vessel (1) with lid (8) in which there is at least one valve, containing elastic sleeve (16) in which is arranged a strong external foil (7) and in it a strong internal foil (11) for utility stuff (12), while internal foil (11) forms together with external foil (7) a limited interspace (13) for a pressure gas.

Description: PRESSURE CONTAINER, PARTICULARLY FOR FOOD, DRUGS, COSMETICS, PAINTS AND CHEMICAL PRODUCTS Field of the invention The invention relates to a pressure container, particularly for food, druggist, cosmetic, painting and chemical protective stuffs, comprising a protective vessel with a lid, containing at least one valve. Background of the invention Known pressure containers usually comprise metal pressure vessel containing a utility stuff, e.g. hair lacquer, perfume, liquid soap, mustard etc. Freon is usually used to force the utility stuff out of the pressure container, at present also other less harmful media such as propane-butane are used. Relatively high production costs of used pressure vessel is a disadvantage of said containers. The use of freon is undesirable from ecological point of view. The use of propane-butane is on the one hand dangerous, on the other hand sterility of a utility stuff is not secured. Another known solution uses the memory characteristics of an elastic material, e.g. rubber, to force a utility stuff out. A pressure container is known, where said container comprises a protective vessel in which there is an elastic bag hermetically connected to charging and discharging valve being situated in the lid of the protective vessel . It is known that to prevent contact of a utility stuff with internal surface of elastic bag a foil inert to a utility stuff is used, said foil being fixed also to mentioned valve. The utility stuff is forced out of the pressure container by the contraction of said elastic bag. There is no gaseous working medium with this principle. But its practical use is problematic, because a relatively large rest content of a utility stuff remains in the elastic bag which the elastic bag is not able to force out and a constant and continuous forcing out the utility stuff is not secured. Another pressure container comprising also only a protective vessel . e.g. of a plastic material, contains a hollow closed elastic body sealed by the circumference of the lid, above which in the lid there is a charging valve being at the same time a discharging valve. Forcing out of the utility stuff from this container from the space above the upper part of concave closed elastic body takes place after pressing the valve due to the contraction of the material of concave upper part and concave lower part of the hollow closed elastic body. During the last phase then due to the expansion of gaseous medium compressed inside the hollow closed elastic body during charging the pressure conainer, what secures rest-less discharge of the utility stuff. A disadvantage of said solution is that the hollow closed elastic body must be made of high quality rubber preventing gas permeability from the hollow closed elastic body and securing a high chemical stability against the utility stuff. Mentioned solution is relatively expensive with regard to the use of a relatively large amount of elastic material . A pressure container is also known, designed particularly for fire-extinguishing substances, comprising a protective vessel made for example of aluminium or of a plastic material, being provided with an air-bleeding opening and with a throat in the upper part, said throat having an upwards directed opened circular bed created in the internal circumference of the throat, while a lid with a charging and discharging valve is removably placed on said throat . This type of pressure continer comprises between the circular bed and the lid a clamped shoulder of elastic storage container partly reaching into internal space of the protective vessel, while to a charging and discharging valve is fixed a working bag partly reaching into internal space of elastic storage container into which leads the charging and discharging valve of the fire-extinguishing substance being fixed in the lid and provided with a discharging nozzle on the lid outside. A disadvantage of mentioned solution is the necessity to use a relatively large quantity of elastic material to produce the elastic bag, said elastic material must be of high quality. Mentioned solution is suitable mostly for fire-extinguishing substances. Summary of the invention The aim of the invention is to eliminate the disadvantages and shortcommings of existing pressure containers and to give such a container, which would meet all requirements of business, ecology, hygiene, economic technology, long-time storing ability and the lowest production costs. Mentioned disadvantages are eliminated by a pressure container, particularly for food, druggist, cosmetic, painting and chemical protective stuffs according to the invention, being characterized in that is comprises an elastic sleeve in which there is arranged a strong external foil and in it a strong internal foil for a utility stuff, while said internal foil forms together with an external foil a limited interspace for a pressure gas. It is advantageous to provide the external foil with a shoulder which is together with a shoulder made on an elastic sleeve placed in a circular bed in a throat of a protective vessel, while both shoulders are hermetically clamped between a throat and a lid with a charging and discharging valve provided with an internal foil and with a pressure valve leading into mentioned interspace. According to the invention only a shoulder of external foil can be hermetically clamped between a throat and a lid and internal foil can be fixed to a charging and discharging valve, while an elastic sleeve is of a hose type with both ends open and slid on at least a part of external foil, while a cylindrical protective cover is fitted on the throat. It is advantageous if internal foil and external foil are together fixed to a charging and discharging valve. It is also advantageous if in a circular bed there are placed an external foil shoulder and an internal foil shoulder. A part of external foil not covered by elastic sleeve can be provided with a check valve leading into an interspace. According to the invention, hose-type elastic sleeve can be provided with a closed bottom and its upper edge can be fixed to circumferential part of a throat and to form at the same time a protective vessel . According to one, also advantageous embodient, external and internal foils can be coaxially fixed to a lid, while an elastic sleeve is then fixed to circumferential part of a lid forming at the same time a protective vessel. In this case, internal foil is fixed to a cover by pressing its shoulder by a fixing ring and external foil is fixed by pressing of its shoulder by another fixing ring into a lid of a protective vessel . Elastic sleeve can be also fixed to a cover by sliding on with an overlap, or glued, vulcanized, hemmed or pressed-in. According to the invention, elastic sleeve can be provided with perforation or it can be elastic netting or it can be a system of elastic rings arranged one beside each other or with spacings between them and they can be mutually connected by bridges . It seems to be advantageous, if internal and external foils form one total as a closed bag of a length being the WO 98/13292 PCTVCZ97/0OO33 sum of necessary lengths of internal and external foils, being provided with a check valve and at the interface of both length being provided with a rign formed by thickening of closed bag wall and designed to be placed into opened bed in a throat, or to be slid on and fixed to a charging and discharging valve in a protective vessel lid. The advantage of the sulution according to the invention is that due to the use of external foil which is made of a strong and gas impermeable material it is possible to produce elastic sleeve of a gas permeable material, i.e. material from this point of view of lower quality and thus cheaper. External foil does not need to be inert against a utility stuff because it does not come in contact with it at all. Elastic sleeve can be also perforated, or it can be produced of elastic netting, or it can be formed by a system of elastic rings what further decreases material requirements and decreases the weight of the whole pressure container. An advantage of said pressure container is further t&e fact that it can be produced even in larger di ensiαπis, e.g. in the size of a barrel, where saving of elastic material is very expressive. Another advantage of the solution according to the invention is that elastic sleeve can form at the same time a protective vessel with the possibility to be prepared from the point of view of its design, e.g.in the form of a figure. Brief description of the drawings Preferred embodiment of the invention is illustrated in the drawings, where Fig. 1 is a schematic axial section of assembled empty pressure container according to the first preferred embodiment, Fig. 2 is a schematic axial section of a pressure container according to the first preferred embo- diment with external foil charged with pressure gas and pre-stressed elastic sleeve before charging an internal foil with a utility stuff which is the same as the condition after forcing out a utility stuff from internal foil, Fig. 3 is the same axial section of the same preferred embodiment with internal foil charged with a utility stuff and external foil with a pressure gas, Fig. 4 is a schematic axial section of assembled empty pressure container according to the second preferred embodiment, Fig. 5 is the same axial section of the same preferred embodiment with internal foil charged with a utility stuff and external foil with a pressure gas, Fif. 6 is a schematic axial section of assembled empty pressure container according to the third preferred embodiment, Fig. 7 is the same axial section of the same preferred embodiment with internal foil charged with a utility stuff and external foil with a pressure gas, Fig. 8 is a schematic axial section of assembled empty pressure container according to the fourth preferred embodiment, Fig. 9 is the same axial section of the same preferred embodiment with internal foil charged with a utility stuff and external foil with a pressure gas, Fig. 10 is a schemaitic axial section of assembled empty pressure container according to the fifth preferred embodiment, Fig. 11 is the same axial section of the same preferred embodiment with internal foil charged with a utility stuff and external foil with a pressure gas, Fig. 12 is a schematic axial section of assembled empty pressure container according to the sixth preferred embodiment, Fig. 13 is the same axial section of the same preferred embodiment with internal foil charged with a utility stuff and ex ¬ ternal foil with a pressure gas, Fig. 14 is an example of internal and external foils positioning with fixing rings in a lid, Fig. 15 is an axonometric view of an elastic sleeve provided with perforation, Fig. 16 is an axonometric view of an elastic sleeve made of elastic netting, Fig. 17 is an axonometric view of an elastic sleeve formed by a system of elastic rings, Fig. 18 is a vertical axial section of internal and external foils made as one piece to be fixed on a charging and dischargning valve after being produced, Fig. 19 is a vertical axial section of internal and external foils made as one piece to be fixed to a throat of a protective vessel after being produced, Fig. 20 is a vertical axial section of internal and external foils as in Fig.18 after being turned over and after pushing internal foil into external foil, and Fig. 21 is a vertical axial section of internal and external foils as in Fig. 19 after being turned over and after pushing internal foil into external foil. Detailed description of the invention Pressure container as illustrated in Figs. 1, 2 and 3 comprises a protective vessel 1, e.g. made of aluminium or of plastic material, advantageously provided with air-bleeding opening 2 in bottom 2 and with throat 4. in the upper part . Throat 4, is provided with in upward direction opened circular bed 5 in its internal circumference, in said circular bed 5_ is inserted a shoulder £ of external foil 1_ which is made of a strong and impermeable material, for example of plastic material. On throat 4. is located, e.g. pressed-on, lid £, which by its circumferential part of face area 1 leans against shoulder £ of external foil 2. Axial part of lid £ is provided with charging and discharging valve 10. with in its outside arranged, not shown, discharging or spraying nozzle and with on its inside fixed internal foil H to be charged with utility stuff 12. Said stuff can be for example food in liquid, pasty or pulpy state, or druggist, cosmetic, painting or chemical protective stuff. Into interspace 12 between internal foil H and external foil 2 reaches a common pressure valve 11 designed to charge said interspace 12 with pressure gas, for example nitrogen or air and fixed also in lid £, but at its circumference. Together with shoulder £ of external foil 2 in the upwards directed opened circular bed 5. of throat 4 there is another shoulder 1£ of elastic sleeve 1£ surrounding external foil 2- Shoulder 15. of elastic sleeve 1£ is together with shoulder £ of external foil 2 fixedly claπφed between throat and lid £. Elastic sleeve 1£ is made e.g. of rubber with long-time memory, while said material may be gas permeable, thus from this point of view a lower quality material may be used. Material of elastic sleeve 1£ can be even perforated, as illustrated in Fig. 15. Elastic sleeve 1£ can be made also of elastic netting 12, as illustrated in Fig. 16. Pressure container according to the second preferred embodiment, i.e. as illustrated in Figs. 4 and 5 differs from the pressure container according to the first preferred embodiment in the design of elastic sleeve 1£ which is only slid on major part of external foil 1, without being held by- lid £. Elastic sleeve l£ is in this case of a hose type with both ends open, for example as illustrated in Figs. 15 up to 17, while it is made also e.g. of rubber with long-time memory, it may be gas permeable, thus it may be produced even of lower quality material . Elastic sleeve 1£ may be even perforated (Fig. 15), or as illustrated in Fig. 16, it maybe made also of elastic netting 12 or even of elastic rings IS . illustrated in Fig. 17. Said elastic rings IB. may be mutually connected for example by bridges 1£ and arranged closely one beside each other, as illustrated in the lower part of Fig. 17, or they may be arranged spaced, as illustrated in the upper part of the same Fig. 17. In this preferred embodiment, in the upwards opened bed 5. of throat there is only shoulder £ of external foil 2- Protective vessel 1 of said embodiment is divided and comprises throat i . which is fitted on cylindrical cover 2£L in the bottom 2 of which there is again an air-bleeding opening 2. External foil 2 can be in this case on its exposed part, in preferred embodiment in its bottom, provided with a check valve 21 to charge or refil interspace 12 with pressure gas. In this case check valve 21 replaces a pressure valve 14. in lid £. Pressure container according to the third preferred embodiment, i.e. according to Figs. 6 and 7, is provided with elastic sleeve 1£ corresponding to elastic sleeve 1£ as illustrated in Figs . 4 and 5. Said solution differs in the design and fixing of external foil 2, which in said case has no shoulder £ and is fixed together with internal foil H to charging and discharging valve 1£. External foil 1_ is in this case on its exposed part, i.e. for example in its bottom, provided with check valve 21 to charge or refil interspace 12 with pressure gas. Check valve 21 replaces pressure valve 14. in lid £. Pressure container according to the fourth preferred embodiment, i.e. as illustrated in Figs. 8 and 9, is provided with elastic sleeve l£ again corresponding to elastic sleeve 1£ as illustrated in Figs. 4 and 5. But it differs from preceding pressure containers in its design and fixing of internal foil 11 which is in this case provided with shoulder 22, which is together with shoulder £ of external foil 2 inserted in upwards opened bed 5_ of throat and together with it firmly clamped between lid £ and throat 4. External foil 2 is also in this case in its exposed part, i.e. for example in its bottom, provided with a check valve 21 to charge or refil interspace 12 with presure gas . Check valve 21 also here replaces pressure valve 14 in lid £. Internal foil 11 and external foil 2 in the third and fourth preferred embodiments can be made as one piece, as illustrated in Figs. 18, 19, 20 and 21, in the form of a closed bag 22 of a length which is a sum of necessary lengths of internal foil H and external foil 2- Inerface of both lengths of closed bag 22 is provided with a ring 21 made by thickening a wall of closed bag 22 and designed to be inserted into upwards opened bed £ in throat (Figs. 19 and 21) , or to be slid on and fixed to charging and discharging valve 2 L in lid £ (Figs. 18 and 20) . Closed bag 22 is in this case in the zone of ring 2 contracted onto a diameter necessary to be slid on charging and discharging valve in. External foil 2 is in said embodiment of closed bag 22 provided with a check valve 21. Pressure container according to the fifth preferred embodiment, i.e. as illustrated in Figs. 10 and 11 differs from a pressure container according to the first preferred embodiment again in the design of elastic sleeve 1£, which is also slid on external foil 2 and also made for example as illustrated in Figs. 15 up to 17, while it corresponds to elastic sleeve 1£ as in Figs 4 up to 9, but with closed bottom 2£. Upper edge 2£ of elastic sleeve 1£ is fixed, for example by hemming, in circumferential part of throat 4. and advantageously it has a shape of a figure. In such way arranged elastic sleeve 1£ is at the same time a protective vessel and its diameter partly signalls to the user quantity of utility stuff 12 in internal foil 11. Pressure container according to the sixth preferred embodiment (Figs. 12 and 13) comprises a lid £, with both foils coaxially fixed to it, i.e. internal foil H and external foil 2, to lid £ for example by pressing shoulder 22 of internal foil H by fixing ring 2£ and by pressing shoulder £ of external foil 7 by another fixing ring 21, as illustrated in Fig. 14 in enlarged scale. Elastic sleeve 1£ is again slid on external foil 7, again for example as illustrated in Figs 15 up to 17, and again provided with closed bottom 25. Upper edge 2£ of elastic sleeve 1£ is fixed to circumferential surface of lid £ either only by sliding on with an overlap or by glueing or vulcanization. In such a way created elastic sleeve 1£ is at the same time a protective vessel and its diameter again partly signalls to the user quantity of utility stuff 12 in internal foil H. When assembling pressure container as illustrated in Figs. 1, 2 and 3, elastic sleeve l£ is inserted into protec- tive vessel 1 so that its shoulder 1£ fits into circular bed £ of throat 4. of protective vessel 1. Then external foil 2 is inserted into elastic sleeve 1£, shoulder £ of external foil 2 is placed on shoulder 15. of elastic sleeve l£. Lid £ with charging and discharging valve 12 with fixed internal foil 11 and with pressure valve H is fixed on throat of protective vessel 1, lid £ is fixed to protective vessel for exmaple by pressing-on, creating thus a packing clamp of shoulder 15_ of elastic sleeve i£ and shoulder £ of external foil 2 between lid £ and throat 4. of protective vessel 1. Such assembled pressure container (Fig. 1) is charged with pressure gas (Fig. 2) and then with utility stuff 1 (Fig. 3) . When assembling pressure container as illustrated in Figs. 4 and 5, external foil 2 with slid-on hose-type elastic sleeve 1£, e.g. as illustrated in Figs. 15 up to 17 is inserted into protective vessel 1. Shoulder £ of external foil 2 is inserted into circular bed £ of throat 4 of protective vessel 1 and then lid £ with charging and discharging valve 1£ with fitted-on internal foil 11 and with pressure valve are fitted on throat 1 of protective vessel 1. Lid £ is fixed to protective vessel 1 for example by pressing-on, what results in sealed clamp of shoulder £ of external foil 2 between lid £ and throat . Pressure container illustrated in Figs . 4 and 5 can be also assembled so that first a cylindrical cover 2£ is taken down from throat 4, then shoulder £ of external foil 2 which is provided with check valve 21 is inserted into circular bed £ in throat 1, lid £ with charging and discharging valve 10 with fixed internal foil 11 is fitted on throat 1 and it is fixed on said throat 1 for example by pressing on, what results in sealing clamp of shoulder £ of external foil 2 between lid £ and throat 1. Elastic sleeve !£ is then slid on external foil and cylindrical cover 20. is put on throat . When assembling pressure container as illustrated in Figs . 6 and 7, first an internal foil H is fitted onto charging and discharging valve 1£ in lid £ and external foil 2 with check valve 21 are slid on internal foil 11 and both foils are secured against sliding down. Lid £ is then fitted and screwed on throat 1 of protective vessel l and then elastic sleeve 1£ is slid on external foil 2 and cylindrical cover 2£ is placed on throat 4. When assembling pressure container as illustrated in Figs. 8 and 9, shoulder £ of external foil 2 with check valve 21 are inserted into circular bed £ of throat 1 and another shoulder 22 of internal foil 11 is placed on shoulder £. Lid £ only with charging and discharging valve Q. is then fitted on throat 1 and fixed on throat 1 for example by pressing on, what results in a sealing clamp of shoulder 22 of internal foil 11 and shoulder £ of external foil 2 between lid £ and throat 1. Elastic sleeve 1£ is then slid on external foil 2 and cylindrical cover 2£ is fitted onto throat 4. Pressure container as illustrated in Figs . 10 and 11 is assembled so that shoulder £ with external foil 2 are inserted into circular bed £ of throat 1 and lid £ with charging and discharging valve 1£ previously provided with internal foil 11 and pressure valve ϋ are fitted to throat 1. Lid £ is fixed to throat 1 by pressing on. Elastic sleeve 1£ with closed bottom 2£ is then slid on external foil 2 and upper edge 2£ of elastic sleeve is then hemmed into the material of throat 1 in its circumferential part. It is also possible to use inversed procedure, i.e. first elastic sleeve l£ is fixed to throat 1 and described operations follow. Assembly of pressure container as illustrated in Figs . 12 and 13 is performed so that internal foil H with its shoulder 22 is by means of fixing ring 2£ fixed into lid £ with charging and discharging valve 12 and with pressure valve H, external foil 2 is then slid on internal foil H. Shoulder £ of external foil 2 is then pressed into lid £ by another fixing ring 23L - Hose-type elastic sleeve l£ is then slid onto external foil 2, for example as illustrated in Figs 10 up to 12, elastic sleeve 1£ having advantageously closed bottom 2£. Elastic sleeve 1£ is by its upper edge 26 fixed to circumferential face of lid £ and it is fixed by mere sliding on with an overlap, by glueing, vulcanization, hemming or pressing in. Interspace 12 of assembled pressure container is by means of pressure valve 11 first charged with pressure gas what via external foil 2 prestresses elastic sleeve 1£. With alternative embodiment of pressure container with removable cylindrical cover 2£ as illustrated in Figs. 4 and 5 and other preferred embodiments as illustrated in Figs. 6, 7, 8 and 9, where external foil is provided with check valve 21. pressure gas is supplied into interspace 12 via check valve 21 instead of via pressure valve H and cylindrical cover 2Q is then fitted onto throat 1. After charging the interspace 12 with pressure gas, internal foil H is via charging and discharging valve 1£ charged with utility stuff 12, what further compresses the gas in interspace 12/ action of gas on external foil 2 simultaneopusly extends elastic sleeve 1£, the latter almost entirely fills up internal space of protective vessel 1. Air, contained in said internal space 12, escapes via air bleeding opening 2 in bottom 2 of protective vessel 1. With preferred embodiments as illustrated in Figs. 10, 11, 12 and 13, where elastic sleeve 1£ is directly a protective vessel, charging of internal foil 11 with utility stuff 12 proceeds exactly in the same way, including extension of elastic sleeve 1£, but previously given shaping of its surface takes place. When using a pressure container, charging and discharging valve 1£ is pressed by a finger, what causes discharging of utility stuff 12 from internal foil H due to contraction of elastic sleeve 1£ acting on external foil 2 and further via compressed gas in interspace 12 on internal foil 11. Industrial applicability Pressure container according to the invention can be used for various utility stuffs, particularly for food, druggist, cosmetic, painting and chemical protective stuffs both in the household and in the industry and agriculture.

Claims: C L A I M S 1. Pressure container, particularly for food, druggist, cosmetic, painting and chemical protective stuffs, comprising protective vessel with a lid with at least one valve installed in it, being characterized in that it comprises elastic sleeve (16) , in which is arranged a strong external foil (7) and in the latter a strong internal foil (11) for utility stuff (12) , while internal foil (11) forms together with external foil (7) a limited interspace (13) for a pressure gas. 2. Pressure container as claimed in Claim 1, being characterized in that external foil (7) is provided with shoulder (6) which is together with shoulder (15) of elastic sleeve (16) located in circular bed (5) on throat (4) of protective vessel (1) , while both shoulders (6,15) are hermetically clamped between throat (4) and lid (8) with charging and discharging valve (10) provided with internal foil (11) and with pressure valve (14) leading into interspace (13) . 3. Pressure container as claimed in Claim 1, being characterized in that between throat (4) and lid (8) there is hermetically clamped only shoulder (6) of external foil (7) and internal foil (11) is fixed to charging and discharging valve (10) , while elastic sleeve (16) is of a hose type with both ends open and is slid on at least a part of external foil (7) , while a cylindrical protective cover (20) is fitted on throat (4) . 4. Pressure container as claimed in Claim l, being characterized in that internal foil (11) and external foil (7) are together fixed to charging and discharging valve (10) . 5. Pressure container as claimed in Claim 1, being characterized in that in circular bed (5) is placed external foil (7) by its shoulder (6) and at the same time internal foil (11) by its shoulder (22) . 6. Pressure container as claimed in Claims 1 and 3 up to 5 being characterized in that external foil (7) is provided on its by elastic sleeve (16) uncovered part with check valve (21) leading into interspace (13) . 7. Pressure container as claimed in Claim l, being characterized in that elastic sleeve (16) is provided with a closed bottom (25) and by its upper edge (26) it is fixed to circumferential part of throat (4) and simultaneously it forms a protective vessel . 8. Pressure container as claimed in Claim 1, being characterized in that external foil (7) and internal foil (11) are coaxially fixed to lid (8) . while elastic sleeve (16) is fixed to circumferential part of lid (8) and simultaneously it forms a protective vessel. 9. Pressure container as claimed in Claims l and 8, being characterized in that internal foil (11) is fixed to lid (8) by pressing its shoulder (27) by a fixing ring (28) and external foil (7) by pressing it shoulder (6) by another fixing ring (29) into lid (8) of protective vessel (1) . 10. Pressure container as claimed in Claims l and 7 up to 9, being characterized in that elastic sleeve (16) is fixed to lid (8) by sliding on with an overlap, or glued, vulcanized, hemmed or pressed in. 11. Pressure container as claimed in Claim 1, being characterized in that elastic sleeve (16) is provided with perforation. 12. Pressure container as claimed in Claim 1, being characterized in that elastic sleeve (16) is made of elastic netting (17) . 13. Pressure container as claimed in Claim 1, being characterized in that elastic sleeve (16) is a system of elastic rings (18) being arranged one beside another. 14. Pressure container as claimed in Claims 1 up to 13, being characterized in that elastic rings (18) are mutually spaced and connected by bridges (19) . 15. Pressure container as claimed in Claim 1, being characterized in that internal foil (11) and external foil (7) are one part in a form of closed bag (23) of a length which is a sum of necessary lengths of internal foil (11)_ and external foil (7) being provided with a check valve (21) and which at an interface of both length is provided with ring (24) formed by thickening a wall of closed bag (23) and designed to be inserted into opened bed (5) in throat (4) or to be slid on and fixed to charging and discharging valve (10) in lid (8) of protective vessel (1) .

Inventors: PISTEK VACLAV, PISTEK, VACLAV
Applicants: PISTEK VACLAV, PISTEK, VACLAV
Application year: 1997
Main classification: B67D1
IPC codes: B65D47, B65D83, B67D1, B67D5