Abstract: A blow molded container having a multi-functional base which enables use of the container in both hot-fill operations and pasteurization/retort operations and enables efficient vertical stacking of like containers. To this end, a portion of the base is capable of flexing upwardly and/or downwardly in response to variations in pressures in a filled and sealed container. Structurally, the base has a discontinuous concave outer annular wall forming a discontinuous standing ring and an inner annular wall functioning as a flex panel. The inner annular wall connects outwardly to a plurality of radial webs extending at an elevation above the standing ring and connects inwardly to an anti-inverting, upwardly-projecting dome. Preferably, a shoulder extends radially inward on the inward facing side of the outer annular wall above a level of the standing ring to facilitate vertical stacking of containers having like bases.

Abstract: A plastic container having a base portion adapted for vacuum absorption. The base portion including a ring upon which the container is supported, an upstanding wall and a recessed portion. The upstanding wall being adjacent to and generally circumscribing the contact ring. The recessed portion being defined in at least part by a flat base region and a central base region. The flat base region extending from the upstanding wall toward a longitudinal axis of the container. The flat base region defining a projected surface area of at least 45% of a total projected surface area of the container. The flat base region being moveable to accommodate vacuum forces within said container.

Abstract: A sidewall portion for a plastic container used to receive a commodity and to retain the commodity during high temperature pasteurization and after cooling. The plastic container has an upper portion defining an aperture sealed by a closure, a lower portion forming a base, and a sidewall portion unitarily connected with and extending between the upper portion and the lower portion. The sidewall portion includes panels having a vacuum panel portion unitarily formed in and inwardly recessed from the sidewall, and a pressure panel portion unitarily formed with the vacuum panel portion. The pressure panel portion is movable from a first position to a second position during pasteurization thereby increasing the volume of the container and avoiding any significant deformation of the sidewall portion.

Abstract: A method of making a polyester container having an enhanced level of crystallinity in the sidewall while maintaining a low level of crystallinity in a thickened base portion. The container is particularly useful as a refillable container which can withstand higher caustic wash temperatures and exhibits reduced flavor carryover, or as a hot-fill container. According to the method, a sidewall-forming section of a preform is initially expanded, heated to contract and crystallize the same, and than reexpanded; a base-forming portion of the preform is shielded from the heat treatment and is expanded either before or after the heat treatment step.

Abstract: A manufacturing apparatus for manufacturing a can having a can body including a dome section and an annular projection. The dome section is formed on a bottom of the can and is recessed inwardly of the can body. The annular projection is formed around a peripheral edge of the dome section so as to project outwardly in a direction of an axis of the can. A plurality of inner recesses are formed on an inner wall of the annular projection. The apparatus includes: an apparatus main body; a mandrel disposed on the apparatus main body for supporting the can body; a can bottom processing unit disposed on the apparatus main body so as to be relatively movable in the direction of the can axis with respect to the can bottom.

Abstract: A closure end is provided, particularly made of sheet material for beverage cans, in which an annular fringe region is radially coupled between the central panel portion and a radius of curvature coupled to a core groove with an inner leg. The central panel portion is squeezed such that material is displaced (flows) from the fringe region in a substantially radial outward direction towards the radius of curvature. The squeezing is accomplished by a coining tool having a coining surface operable to contact the closure end. The closure surface is pressed against the closure end causing the thickness of the sheet material of the closure end to be reduced in the annular fringe region. The reduction in thickness gradually decreasing in the direction of the radius of curvature. The material displaced by the squeezing flowing towards the radius of curvature.

Abstract: The invention includes a novel profile for a container bottom and method of manufacturing the improved bottom. The improvement involves the creation of an additional angled portion in the inner leg area of a container bottom during the formation of the bottom profile during the bodymaking step. Known container bottom profiles have a single portion in the inner leg area after the bodymaking process. The inventive profile includes the following discrete portions starting at the nose of the container bottom and working inwards towards the central axis: a nose, a substantially linear lower leg portion projecting upwards from the nose, a separate angled portion between the lower leg portion and the dome inclined generally at an angle more towards the longitudinal central axis of the container than the angle of the lower leg portion, and a dome.

Abstract: An inserted lid (1) for a box (2) is formed so that a contact region (5) can be pressed against the inside of the side wall of the box. In the non-inserted state, said side wall is slightly larger than the box opening (4). On insertion of the lid (1) into the box (2), the largest circumferential line of the contact region (5) must fit the inside of the side wall of the box as a result of an elastic deformation of the closure surface (3). To prevent the forces emanating on insertion from the side wall of the box from leading to irreversible deformations, the closure surface (3) has spring properties which are radial with respect to the contact region (5) and permit an elastic deformation of the contact region (5) in the radial direction. To ensure these spring properties, the closure surface (3) has a shape differing from a flat surface, in particular two concentric waves (7) formed constant distances away from the contact region (5) and/or a central vault (8).

Abstract: A container for containing a food product and an ancillary product is provided, which includes a tubular body formed of a paperboard material, at least one retaining rim formed by bending one of the ends of the tubular body radially inwardly, and a cup for holding ancillary products and separating and protecting the ancillary products from the food product. The cup has an open end which is in engagement with the retaining rim for retaining the cup within the tubular body. In this arrangement, the container is capable of withstanding internal pressure generated by packaged dough or other pressurized products without the use of expensive, opaque crimped metal ends, thereby overcoming deficiencies of conventional product and ancillary product containers. This arrangement permits the container to utilize transparent plastic ends so that consumers may observe the ancillary product packaged in the container and avoid food product discoloration frequently caused by metal ends.

Abstract: A drawn and ironed can having a generally cylindrical side wall and an integral bottom including two annular rims is provided. The bottom of the can has a reduced volume configuration, wherein the upright can rests on an outer annular rim known as the heel, and an expanded volume configuration, wherein the upright can rests on an inner annular rim known as the nose. When a can in the reduced volume configuration is subject to an elevated internal pressure substantially less than the maximum working pressure, a portion of the can bottom comprising the nose moves axially downwardly relative to the rest of the can to serve as a new base, thus transitioning the can into the expanded volume configuration.

Abstract: A container has a movable end closure for accommodating expansion or contraction of the product packaged therein. The container includes a hollow body portion with opposed open ends and an inside surface and an end closure positioned at each of the open ends of the hollow body portion and secured thereto for closing the container with product contained therein. One of the end closures is of a generally cup-shaped configuration and has a radially-extending central portion of generally the same configuration and dimensions as the inside surface of the body portion and an accordion-folded sidewalk extending axially from the central portion toward the body portion open end to define a free end area secured to the inside surface of the body portion at the open end.

Abstract: A hot fill container formed from a polymeric material is disclosed. The container comprises a base (4), a body (2), and a neck (1), wherein the body (2) comprises an odd number of spaced-apart panels (5) that are responsive to internal pressure changes in the container. Hot fill bottles of a given capacity having an uneven number of deformable panels, e.g., five of a given wall thickness, unexpectedly accommodate significantly higher volume reductions before collapsing and distorting in an uncontrolled manner than known hot fill bottles of the same capacity having an even number of panels, e.g., six of the same wall thickness.

Abstract: A method of making a polyester container having an enhanced level of crystallinity in the sidewall while maintaining a low level of crystallinity in a thickened base portion. The container is particularly useful as a refillable container which can withstand higher caustic wash temperatures and exhibits reduced flavor carryover, or as a hot-fill container. According to the method, a sidewall-forming section of a preform is initially expanded, heated to contract and crystallize the same, and than reexpanded; a base-forming portion of the preform is shielded from the heat treatment and is expanded either before or after the heat treatment step.

Abstract: This invention comprises a sanitary beverage can lid wherein the center platform of the lid including the pull tab is raised from below the rim of the can as in conventional cans to a position close to or slightly above the rim of the can. The center platform diameter is reduced in diameter to provide additional space from the exterior of the can body to the edge of the platform. The pull tab is positioned in the middle of the center platform so that the end of the pull tab is at the edge of the center platform to facilitate opening of the can. The raised center platform and the lid design prevent an individual's lip from coming in contact with the groove along the edge of the lid where dirt may accumulate. Another feature is the provision of a raised rim on the platform with an interior drain-back slope so that any excess beverage flows back into the can.

Abstract: A thin walled, easily crushable container with an integral or seamed-on bottom is filled with an edible material which requires sterilization. The empty container has one end attached or integral that may have a concave slope relative to the inside of the container. A liquified or solidified inert gas is then inserted into the container. The container is then sealed with a concave shaped end before the inert liquified or solidified gas has completely vaporized. The ends are such that they do not bulge under the pressure left after sterilization, which pressure is due to the pressurization effect of the inert gas and which pressure is enough to overcome the vacuum caused by the cooling of hot water vapor or steam above the edible material and gives the can the required rigidity.

Abstract: A drawn and ironed can having a generally cylindrical side wall and an integral bottom including two annular rims is provided. The bottom of the can has a reduced volume configuration, wherein the upright can rests on an outer annular rim known as the heel, and an expanded volume configuration, wherein the upright can rests on an inner annular rim known as the nose. When a can in the reduced volume configuration is subject to an elevated internal pressure substantially less than the maximum working pressure, a portion of the can bottom comprising the nose moves axially downwardly relative to the rest of the can to serve as a new base, thus transitioning the can into the expanded volume configuration.

Abstract: Gas-tight container featuring an outer shell of metal or metal and plastic or metal and cellulose-containing material, a base, a lid and at least one side-wall. The container may be e.g. a can with, as viewed in plan view, a polygonal, round or oval cross-section. The base or part of the base of the gas-tight container exhibits a region which may be made to bulge and which is surrounded by an endless depression and, in the condition in which the can may be used, is in the form of a concave bulge. A container of this kind is such that one can readily recognize if the contents have suffered from spoiling or decomposition and, as a consequence, gas has been formed inside the container. If the pressure inside the container increases, the bulge is pushed outwards and, usefully, may form a convex bulge.

Abstract: A lid 1 for a container body 8 having a side wall 7 portion at one end of which an annular portion 9 extends at an obtuse angle to the side wall to define the mouth of the container. The lid has an elastically deformable central panel 2 and a peripheral annular flange 3 which extends downwardly and outwardly from the central panel to define a seal surface to co-operate with the annular portion 9 of the body. When adhered or fused together the inclined portion of the lid and body receive the stress, arising as a thermal processing increases the volume of product packed, as a load in shear peel force being minimized.

Abstract: A lug lid (10) which closes an open head pail (12) has lugs (31) that overlap the annular rim (19) of the pail and which are crimped thereabout to attach the lid to the pail. An annular expansion bead (38) is formed in the lid to enable the lid to expand to relieve some of the increases in internal pressure which might occur in the container. Sacrificial depressions (46) are formed in the lid (10) adjacent the expansion bead (38) with each sacrificial depression radially aligned with a lid lug (31). The sacrificial depressions selectively weaken the lid to control the formation of wrinkles (47) in the lid in response to increased pressure within the materials container, with such wrinkles being formed in radial alignment with the lugs of the lid, where the connection between the lid (10) and the pail (12) is strongest.

Abstract: A plastic blow molded container (10) is disclosed as including a freestanding base structure (20) that is constructed with a plurality of alternating hollow legs 22 and curved ribs (34), and a hub (41) from which the legs and ribs extend radially with a construction that provides good stability against tipping as well as the capability of withstanding internal pressure. The specific construction disclosed of the legs (22), ribs (34) and hub (41, 41', 41") enhance the capability of the base structure in providing good stability as well as the capability of withstanding internal pressure and stress cracking.

Abstract: A plastic blow molded container (10) is disclosed as including a freestanding base structure (20) that is constructed with a plurality of alternating hollow legs 22 and curved ribs (34), and a hub (41) from which the legs and ribs extend radially with a construction that provides good stability against tipping as well as the capability of withstanding internal pressure. Each rib (34) has an outer upper end (36) with a circumferential width W.sub.u and an inner lower end (38) with a circumferential width W.sub.l that is greater than the circumferential width W.sub.u of the upper rib end so the lower rib end is capable of resisting stress cracking. An intermediate rib portion (40) of a curved shape tapers between the ends with an included angle B in the range of about 1.degree. to 8.degree. and preferably about 2.degree.. The legs (22) have lower flat feet (24) with an outer diameter D.sub.f, and the hub (41) has a periphery connected to the feet and ribs with a height H.sub.

Abstract: A plastic blow molded container (10) is disclosed as including a freestanding base structure (20) that is constructed with a plurality of alternating hollow legs 22 and curved ribs (34), and a hub (41) from which the legs and ribs extend radially with a construction that provides good stability against tipping as well as the capability of withstanding internal pressure. Each rib (34) has an outer upper end (36) with a circumferential width W.sub.u and an inner lower end (38) with a circumferential width W.sub.l that is greater than the circumferential width W.sub.u of the upper rib end so the lower rib end is capable of resisting stress cracking. An intermediate rib portion (40) of a curved shape tapers between the ends with an included angle B in the range of about 1.degree. to 8.degree. and preferably about 2.degree..

Abstract: An end wall for a can body has a central panel (7) surrounded by a conventional expansion ring (8) which is connected to an inner wall (16) of a channel portion by an upwardly extending deformable annulus (17, 18) so that during thermal processing of a closed can having this end wall, the deformable annulus changes shape to permanently increase the container volume. The deformable annulus protects the side wall and ends of the can from excessive pressure so thinner container materials may be used.

Abstract: A one piece plastic container for carbonated beverages has a footed base structure. The upper portion of the base structure includes hollow projections between which are formed relatively stiff strap formations. A deformable open region at the upper end of the strap formations is easily deformed and expands in a controlled fashion when the container is pressurized. Outward movement of the open region causes outward movement of the upper ends of the strap formations which then pivot about the feet causing the lower ends of the strap formations and the central region of the base structure to move upwardly.

Abstract: A container (1) of thermoplastic material comprising a side wall (2) and a base (3), said base comprising in a cross section in a plane comprising the container's vertical axis (A), a concave inwards curved section (4) connected to the side wall (2), at least two successive stairs, each stair consisting of a straight part (5,5') forming an angle (.alpha.1, .alpha.2) with a plane (B) perpendicular to said axis (A), followed by a sharp concave outwards curve (6,6'), and a dome (8) consisting of a smooth concave outwards curve, said base (3) being symmetrical about said axis (A).

Abstract: The invention provides a self-standing blow molded two liter carbonated beverage bottle 1 weighing under 50 grams and having a unique petaloid base 7. The base comprises a petaloid design which has a plurality of at least three (preferably five) feet 9. Between each adjacent pair of feet is a radially extending valley 12 the width of which decreases with increasing radial distance from the bottles longitudinal axis toward a point of convergence 14 radially outside the bottle's diameter. The valley floor generally follows the hemispherical base shape and opens to an extended portion 13 of that base shape lying radially outwardly of the feet. The valley and extended portion initial pressurization of the bottle, deformation of the extended portions outwardly with a resulting raising of the center of the base away from the support surface.

Abstract: A hot-fillable plastic container having a panel section with vacuum panels and an end grip, which panel section resists ovalization and other deformation during filling, product cooling, and handling. The container has a substantially-cylindrical panel section, with a pair of vertically-elongated vacuum panels disposed on opposing sides of a vertical plane passing through a vertical centerline of the container. Front and rear label attachment areas are provided between the vacuum panels. A pair of vertical ribs are disposed on either side of each vacuum panel which act as hinge points to maximize movement of a concave recess in the vacuum panel; the vertical ribs also resist longitudinal bending.

Abstract: A container made from a synthetic resin, in particular, polyethylene terephthlate. The resin, after having been dried, is first injection molded into a preform like a test tube, and then softened by heating, and finally the required container is made by using the blow drawing technique in combination with a mold designed according the present invention for integrally blow molding containers having a radial base reinforcement structure. Said base reinforcement structure of the container comprises radially arranged enlarged feet, webs, and ribs, and a hub.

Abstract: A base configuration for use with biaxially stretched blow molded PET containers is provided. In particular, the base includes a concave spherical portion disposed at a central position on the base. A first protruding circular member is formed around the circumference of the concave spherical portion. An annular groove is disposed around the first protruding circular member. A second protruding circular member is formed around the circumference of the annular groove. Five legs extend radially outward from the second protruding circular member. The outer surface of each leg subtends an angle of 72 degrees, and a curved rib is formed between every pair of legs, the ribs having an umbrella bone structure and each of the ribs subtending an angle of 0 degree, whereby the base of the container has an increased internal pressure resistance and thus prevents cracking in the base.

Abstract: A freestanding container base having an improved combination of properties in regard to creep resistance, stress crack resistance, impact strength, weight, standing stability and formability. The container base has a substantially hemispherical bottom wall which includes four radiating ribs, and four legs extending downwardly from the bottom wall between the ribs and each of which terminates in a foot. Each rib has a rib wall forming part of the substantially hemispherical bottom wall and having an angular extent of from about 15.degree. to about 30.degree. for enhanced strength, with the leg occupying the remaining 75.degree. to 60.degree. angular extent for enhanced formability. The outer edge and angular extent of the foot are predetermined for enhanced stability and ease of formability. Preferably, the creep resistance is further enhanced by straightening the upper rib portion or providing an enlarged-diameter truncated bottom wall.

Abstract: A hot-fillable, blow-molded container has a body portion with grip panels extending between a front label panel and a rear palm panel. The container body is configured to accommodate reductions in volume caused by hot-filling, capping, and subsequent cooling of contents in a manner which retains its aesthetic appearance when cooled yet which retains its structural integrity when opened and its contents poured.

Abstract: A hot-fill plastic container includes a plurality of elongated vertically oriented vacuum absorption panels in its sidewall, each of the panels having an outwardly projecting center portion which is divided into upper and lower panel portions by a transversely extending rib, the panel portions being connected to the top and bottom of the vacuum panel by outwardly curved connecting portions which reverse the curvature of the vacuum panel adjacent to its upper and lower edges to reinforce the vacuum panels to prevent the sidewall from taking a permanent set which deflected inwardly, the corners of the vacuum panel having a relatively large radius of curvature to provide stiffening of the panels at their corners. Annular reinforcement ribs located in the sidewall above and below the vacuum panels provide additional support for the upper and lower edges of the vacuum panels.

Abstract: A container of a heat set plastic material adapted for hot fill applications includes a plurality of elongated vertically oriented vacuum panels in its sidewall and first and second circumferentially extending inwardly directed reinforcement ribs which are located in the label mounting areas above and below the vacuum panels and which cooperate with upper and lower label bumpers of the container to support the upper and lower edges of the vacuum panels permitting the center portions of the panels to flex inward during filling and sealing the container with a hot liquid, but resisting deformation of the container sidewall in compensating for the hot-fill vacuum.

Abstract: A base configuration for use with biaxially stretched blow molded PET containers is provided. In particular, the base includes a concave spherical portion disposed at a central position on the base. A protruding annular member is formed around the circumference of the concave spherical portion, and five legs extend radially outward from the annular member. The outer surface of each leg subtends an angle ranging from 40-72 degrees, and a curved rib formed between every pair of legs, the rib subtending an angle ranging from 32-0 degrees, whereby the base of the container has an increased internal pressure resistance and thus prevents cracking in the base.

Abstract: A plastic blow molded container (10) is disclosed as including a freestanding base structure (20) that is constructed with a plurality of alternating hollow legs 22 and curved ribs (34), and a hub (41) from which the legs and ribs extend radially with a construction that provides good stability against tipping as well as the capability of withstanding internal pressure. Each rib (34) has an outer upper end (36) with a circumferential width W.sub.u and an inner lower end (38) with a circumferential width W.sub.l that is greater than the circumferential width W.sub.u of the upper rib end so the lower rib end is capable of resisting stress cracking. An intermediate rib portion (40) of a curved shape tapers between the ends with an included angle B in the range of about 1.degree. to 8.degree. and preferably about 2.degree..

Abstract: A container (1) made of flexible material (2) is, suitable for either vacuum-packed or nonvacuum-packed products and/or sterilizable products, or for containing liquid products, having stiffening plates as a cover (3) and as a base plate (4) and a system of folds which involves a horizontal folding edge (22) and two opposed vertical folding edges (23). In a first embodiment, the cover plate (3) has a lid (6), for example opening on a hinge, and the base plate (4) contains an expansion chamber (21), which communicates with the outside in order to compensate for any possible variation in the volume of the product inside the container (1), at the moment of packing.

Abstract: There is disclosed a body for a retortable plastic container having a sidewall and bottom wall integrally formed as a single piece. The bottom wall has a heel portion and a recessed center portion. The heel has a resting surface and an inside corner. The recessed center portion has an outside corner. The container has an outside surface. The container is made in accordance with equations relating to reforming pressure and low fill equilibrium pressure and may be fabricated utilizing a variety of manufacturing modes since the providing of acceptable container configurations is not based on relative wall thicknesses.

Abstract: A product press formed from a paperboard and a method for forming the same is provided, wherein the product includes a press formed three-dimensional curvilinear region having a desired shape and containing a formation improvement structure for facilitating the press formation and maintenance of the desired product shape and for preventing the machine directionality of the paperboard from distorting the product from its desired shape. The press formed paperboard product of the preferred embodiment comprises a planar wall having a periphery which is at least partially curvilinear and a peripheral wall angularly oriented with respect to the planar wall. The peripheral wall extends along at least a portion of the curvilinear periphery of the planar wall and the closest portion of the peripheral wall is spaced a substantial radial distance from the periphery of the planar wall.

Abstract: Retortable high panel strength plastic containers have a recessed circular center portion in the bottom wall of the container which facilitates the volumetric changes in the container during a sterilization process. Examples of containers having this feature are disclosed as well as the cross-sectional profile of the recessed circular center portions of the bottom walls of the containers.

Abstract: A plastics aerosol container includes a top portion having a neck for accommodating an aerosol valve, connected by a shoulder to the aerosol body. The shoulder includes an elbow portion of reduced thickness which acts as a hinge and serves to reduce stress caused, for instance, by transverse impacts on the container, which could otherwise damage or break the container.

Abstract: A hot-fill PET container which includes opposed pinch grip indentations in the sidewall enabling the container to be grasped between the thumb and fingers of one hand to facilitate handling of the container and pouring of liquid from the container. Each indentation comprises an irregularly shaped surface having an outside edge and an integral hinge enabling the indentations to collapse inwardly toward each other to accommodate internal forces tending to collapse the container sidewall inwardly due to filling of the container with liquid at an elevated temperature and subsequent cooling of the liquid.

Abstract: A plastic blow molded container (10) is disclosed as including a freestanding base structure (20) that is constructed with a plurality of downwardly projecting hollow legs 22, a plurality of curved ribs (34) located between the legs, and a hub 41 from which the legs and ribs extend radially with a construction that provides good stability against tipping as well as the capability of withstanding internal pressure. Each leg (22) has a lower flat foot (24) coplanar with the other feet and the feet have an outer diameter D.sub.f that is at least 0.75 of the diameter D of the cylindrical body portion. Each flat foot (24) also has a junction (28) with an associated outer wall (26) of the foot and this junction has a radius of curvature R.sub.j less than 0.05 of the diameter D of the cylindrical body portion.

Abstract: This invention provides a synthetic resin thin-walled bottle, a tubular intermediate therefor and a method of producing a thin-walled bottle. The thin-walled bottle has ribs at least at its bottom portion, and the bottle bottom is raised up frusto-conically or has an undulatory shape. The tubular intermediate is first formed with ribs which become thin-walled protuberant ribs after blow molding. The thin-walled bottle is produced by blow-molding the ribbed tubular intermediate.

Abstract: A plastic blow molded container (10) is disclosed as including a freestanding base structure (20) that is constructed with a plurality of downwardly projecting hollow legs 22, a plurality of curved ribs (34) located between the legs, and a hub 41 from which the legs and ribs extend radially with a construction that provides good stability against tipping as well as the capability of withstanding internal pressure. Each leg (22) has a lower flat foot (24) coplanar with the other feet and the feet have an outer diameter D.sub.f that is at least 0.75 of the diameter D of the cylindrical body portion. Each flat foot (24) also has a junction (28) with an associated outer wall (26) of the foot and this junction has a radius of curvature R.sub.j less than 0.05 of the diameter D of the cylindrical body portion.

Abstract: A container made of thermoplastic material such as PET includes a bottom portion, a neck portion, and an intermediate body portion including at least two circumferential rows of panels for providing controlled volumetric reduction of the container. A land separates each adjacent pair of panels in each row. The rows of panels are staggered with respect to each other such that the lands of one row are vertically aligned with the panels of any adjacent row. The design distributes circumferentially the vertical and horizontal support for any label applied to the label panel of the container while still providing the desired panel movement in response to the existence of a partial vacuum within the container due to hot filling.

Abstract: A blow-molded bottle of thermoplastic resin has a hollow body with a generally cylindrical side wall rotationally symmetric about a longitudinal axis of the bottle and an integral base merging with the side wall. The base is defined by an outer surface having a plurality of arcuately extending downward projections separated from each other by hemispherical segments extending from the cylindrical side wall to the longitudinal axis of the bottle. Each of the arcuately extending downward projections has a first inclined portion contiguous to the longitudinal axis, a second inclined portion situated radially outside of, and axially displaced downwardly from, the first inclined portion, a generally perpendicular ring segment having an upper edge united with the first inclined portion by a curved portion having a radius of between about 0.015 in. and 0.060 in., and a lower edge united with the second inclined portion.

Abstract: A blow-molded plastic container having a body comprising a neck portion, a generally cylindrical sidewall portion and a bottom structure. The bottom structure comprises a central portion, a plurality of ribs extending downwardly from the bottle sidewall to the central portion, and a plurality of feet extending below the central portion from the sidewall portion. The ribs are defined by an upper curvilinear surface and, in cross-section are of an substantially U-shape having a relatively tight radius, the upper rib surfaces lying on a generally hemispherical curvature in the interior of said container.