Multiple compartment package

A multiple compartment package for use in the packaging of foodstuff articles includes a first compartment portion, a second compartment portion, and a retaining mechanism for retaining the first compartment portion in close relation to the second compartment portion.

BACKGROUND OF THE INVENTION 
The present invention relates generally to a multiple compartment package 
for use in the packaging of food. More particularly, the present invention 
relates to a multiple compartment package for separately packaging at 
least two different articles of food that are typically consumed at the 
same time but that cannot be co-packaged in direct contact with one 
another. 
Consumers today rely upon food that can be rapidly prepared at home. Rapid 
preparation depends upon food that is pre-prepared to a degree where 
consumers may merely transfer and heat the food. One type of pre-made food 
enjoyed by consumers is pre-made dough. 
Refrigerated, pre-made dough products are very popular because they enable 
consumers to enjoy home baked goods without expending the time and effort 
needed to prepare the dough. These refrigerated doughs range from doughs 
for biscuits and breads to sweetrolls, to cornbread products. A variety of 
pre-made dough compositions are known in the art. For example, the Yong et 
al. patent U.S. Pat. No. 4,381,315, the Matz patents U.S. Pat. Nos. 
3,356,506 and 3,397,064, the Atwell patent U.S. Pat. No. 4,526,801 and the 
Lutz patent U.S. Pat. No. 3,669,682, each describe refrigerated pre-made 
dough compositions. Refrigerated dough compositions described in these 
patents generally include about 27 to 36.5 percent water by weight and 
about 1 to 3.7 percent by weight of leavening agents. The pressure 
generated by storage of these refrigerated dough compositions is about 1 
to 25 psig. 
Refrigerated, pre-made dough compositions are typically subjected to a 
"proofing" step during which leavening agents in the dough begin to react. 
During the proofing step, the volume of the dough expands by approximately 
1 to about 15 percent. After proofing, the dough is further developed by 
storage in a sealed container at refrigeration temperatures. During this 
time, the leavening agents complete reacting and the internal pressure of 
the container reaches a selected equilibrium pressure and the dough 
attains an equilibrium temperature. 
It is desirable to consumers and food manufacturers to package foods such 
as refrigerated dough products with other foods commonly used with the 
dough to make a final food product. Unfortunately, these other foods 
frequently cannot be packaged in direct contact with dough in a single 
container. For example, foods having a semi-fluid state at ambient 
temperature, such as icing or butter, are not compatible with a semi-solid 
state food, such as dough, because moisture and oil migration from the 
icing or butter into the dough destroy final baked product integrity and 
organoleptic qualities, such as firmness or palatability. Also, the icing 
integrity is destroyed when the dough is heated. 
Further, food products having multiple constituents, such as icing and 
dough, require different conditions for packaging and storage. For 
instance, foods such as icing are packaged under ambient temperatures 
using gravity loading methods. However, other foods, such as dough, 
require packaging under cool or warm temperatures in order to pressurize a 
storage container. The packaged dough is subsequently stored under 
refrigeration. Refrigerated dough storage containers may include 
multi-layer spirally wound or convolute paper containers, as well as 
plastic and aluminum cans. 
The Turpin patent, U.S. Pat. No. 3,851,757, describes a multiple 
compartment container having a cylindrical container portion with a closed 
end and an open end opposite the closed end. A cup is inserted into the 
open end of the cylindrical container portion and is filled with a desired 
product. Next, a separator plate is placed over the cup and dough is 
inserted into the cylindrical container portion. The cylindrical container 
portion is then sealed and the dough is proofed. Proofing causes the dough 
to expand in the container and to force the separator plate against the 
cup to prevent the product in the cup from mixing with the dough. One 
disadvantage of the container described in the Turpin patent is that 
placing the cup in the cylindrical container portion increases the 
complexity of packaging the dough and limits the conditions under which 
the dough can be packaged. 
Another multiple compartment container for packaging incompatible food 
components is described in the Parlour patent, U.S. Pat. No. 3,506,459. In 
the Parlour patent, a cylindrical container has a first end and a second 
end opposite the first end. The first end includes a closure element that 
includes a circular lip that defines a central opening to the cylindrical 
container. A cup having a main body and a flange at an end of the main 
body is inserted into the first end of the cylindrical container. The 
flange permits the main body of the cup to pass through the central 
opening of the cylindrical container but prevents the cup from passing 
through the lip of the closure element. A separating plate is positioned 
over the cup to cover the cup. A seal formed between the lip of the 
closure element of the cylindrical container and the flange of the cup 
allows gas to escape from the container while dough undergoes a proofing 
step and expands. However, if the dough has not leavened sufficiently to 
force the separating plate against the icing cup, the cup contents may 
leak thereby destroying dough developing and container integrity. 
Similarly to the packaging described in the Turpin patent, pressure from 
the expanding dough forces the separating plate against the cup and 
thereby prevents a food stored in the cup from intermixing with the dough. 
However, if the dough has not expanded sufficiently to force the 
separating plate against the cup, the contents of the cup may become 
intermixed with the dough and thereby degrade the quality of the dough. 
Therefore, a multiple compartment container is desired which improves 
reliability of product quality and consumer handling. It is also desirable 
that the multiple compartment container ease production and 
post-production handling. Further, the multiple compartment container 
should accommodate constituents that are supplied in a liquid, semi-fluid 
or solid particulate form so that the constituents can be copackaged with 
the dough constituent. 
SUMMARY OF THE INVENTION 
The present invention includes a multiple compartment package for use in 
the packaging of foodstuff articles including a first cylindrical 
compartment portion, a second cylindrical compartment portion, and a 
retaining mechanism for retaining the first compartment portion in close 
relation to the second compartment portion. The first compartment portion 
includes a cylindrical main body with a cylindrical wall, a first end with 
an attached lid and a second end opposing the first end. The lid is 
attached to the first end such that an annular recess is formed in the 
cylindrical wall of the main body. 
The second compartment portion includes an annular flange with a first side 
and a second side opposing the first side. The first side of the annular 
flange is adapted to fit in close relation to either of the first or 
second end of the first compartment portion. 
The retaining mechanism restricts movement of the annular flange of the 
second compartment portion and fits snugly within the annular recess of 
the first compartment portion to retain the first compartment portion in 
close relation to the second compartment portion.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS 
A multiple compartment package of the present invention, illustrated 
generally at 10 in FIG. 1, includes a first compartment portion 12 having 
a cylindrical main body 17 with an annular wall 18, a second compartment 
portion 14 with an annular lip 50, and a retaining mechanism 16 conjoining 
the first compartment portion 12 and the second compartment portion 14. 
The multiple compartment package 10 of the present invention solves a 
heretofore intractable problem of packaging and storing two or more food 
components that cannot be packed or stored in direct contact with each 
other prior to consumption. The multiple compartment package 10 also 
accommodates different processing and packaging requirements of the 
different food products contained therein. It is contemplated that in one 
embodiment, the second compartment portion 14 stores a fluid or semi-fluid 
food such as icing, butter or gravy or a solid particulate food such as 
nuts or candy and the first compartment 12 stores a food such as dough. 
The combination of the first compartment portion 12, the second compartment 
portion 14 and the retaining mechanism 16 of the present invention permits 
a separation of diverse functions of the multiple compartment package 10. 
For instance, the multiple compartment package 10 may optimize product 
specific features of the package 10 such as compression strength and a 
peelable seal for the first compartment portion 12 while also providing a 
strong attachment of the second compartment portion 14 to the first 
compartment portion 12 with the retaining mechanism 16. 
By separating the functions of product specific compartment features and 
compartment attachment, the sealability of each of the second compartment 
portion 14 and first compartment portion 12 may be improved by increasing 
the sealing options. With more sealing options, each of the compartments 
can be independently sealed according to particular requirements dictated 
by its contents. Such requirements include, but are not limited to, 
protecting the contents from the environment and providing sufficient room 
to accommodate pressure or other changes within a compartment. 
Further, the multiple compartment package 10 is easy to open because the 
retaining mechanism 16 includes a mechanism for loosening the retaining 
mechanism 16 and separating the second compartment portion 14 and first 
compartment portion 12 from each other. Additionally, the multiple 
compartment package 12 has great resistance to blows and other external 
forces to which packages are subjected during shipping and storage because 
the retaining mechanism 16 securely joins the first compartment portion 12 
and the second compartment portion 14. 
The retaining mechanism 16 is provided to retain the second compartment 
portion 14 and the first compartment portion 12 in a mated arrangement, as 
illustrated in FIG. 1, prior to preparation of a food product such as is 
made by baking dough and applying icing to the baked dough. In one 
embodiment shown in FIG. 1, the retaining mechanism 16 has an outer 
diameter that is greater than the outer diameter of the first compartment 
portion 12. Preferably, retaining mechanism 16 has an inner diameter that 
is somewhat less than the outer diameter of the first compartment portion 
12, such that retaining mechanism 16 can be tightly engaged with first 
compartment 12. 
The retaining mechanism 16 defines an aperture 72. In one embodiment, the 
retaining mechanism 16 attaches first compartment portion 12 and second 
compartment portion 14 by holding together rim 41 of the first compartment 
12 and lip 50 of second compartment 14 within aperture 72. 
The retaining mechanism 16 is attached to the first compartment portion 12 
at a first end 31 of the first compartment portion 12. The first end 31 is 
sealed with a lid 30 having an inside surface 32 as shown in FIG. 2. The 
first compartment portion 12 also includes a second end 44 shown in FIG. 
1. While a sealing mechanism is described for the first end 31, it is 
understood that the second end 44 can be sealed in any suitable manner. In 
one embodiment, second end 44 is sealed in a manner substantially the same 
as the first end 31. Consequently, the second compartment portion 14 may 
be attached to the second end 44 with the retaining mechanism 16 in a 
manner substantially the same as attachment to the first end 31 of the 
first compartment portion 12. 
The lid 30 includes an integral annular lip 34 and an annular shoulder 38 
that aid in attachment of the lid 30 to the cylindrical main body 17 as 
shown in FIG. 2. In particular, lid 30 is attached to the rim 41 of a body 
wall 18 of the main body 17 by rolling the annular lip 34 of the lid 30 to 
pinch the body wall 18 of the main body 17 between annular lip 34 and 
annular shoulder 38. A seamer may be used to roll the annular lip 34 of 
the lid 30 to the main body 17, whereby lip 34 presses against body wall 
18, thereby forming an annular recess 42 in the body wall 18. 
In one embodiment, the retaining mechanism 16 includes a main body 140 
having an upper annular segment 142 contiguous with a side annular segment 
144. Side annular segment 144 has an outer concentric surface 87 and an 
inner concentric surface 84 opposing the outer concentric surface 87, as 
shown in FIG. 4. Upper annular segment 142 and side annular segment 144 
define aperture 72. Upper annular segment 142 forms shoulder 145 which 
retains lip 50 of second compartment portion 14 within the aperture 72. In 
one embodiment, inner concentric surface 84 is of a diameter that provides 
sufficient clearance so that the annular lip 50 of the second compartment 
portion 14 may be positioned and retained on the lid 30 of the first 
compartment portion 12 when conjoined by the retaining mechanism 16, as 
illustrated in FIG. 1. 
The side annular segment 144 includes a plurality of locking lugs 80, 
integral to the inner concentric surface 84 of the side annular segment 
144 as shown in cross-section in FIG. 2, and concentrically arranged as 
shown in FIG. 4. The locking lugs 80 are concentrically positioned so that 
when the retaining mechanism 16 is placed over the lid 30 of the first 
compartment portion 12, the locking lugs 80 snugly fit within the annular 
recess 42 of the body wall 18 of the first compartment portion 12 and are 
held in tension against the annular lip 34 of the first compartment 
portion 12. Once the locking lugs 80 are in position, the lugs 80 cannot 
be displaced without altering side annular segment 144. Side annular 
segment 144 can be altered, for example, by breaking retaining mechanism 
16 or by stretching retaining mechanism 16 by prying apart second 
compartment portion 14 from multiple compartment package 10. 
Alternatively, the compartments can be separated by removing upper anuular 
segment 142 of retaining mechanism 16. With any of these arrangements, the 
first compartment portion 12, the second compartment portion 14, and the 
retaining mechanism 16 are retained together as the single multiple 
compartment package 10. 
It should be appreciated, however, that while the retaining mechanism 16 
has been described as being attached to a first compartment portion 12 
with a lid 30 having a shoulder 38 and a lip 34, the retaining mechanism 
16 may be used with other types of first compartment portions. However, 
like the first compartment portion 12 described, the other types of first 
compartment portions will have the main body wall 18 such as is shown in 
FIG. 2 having the annular recess 42. Locking lugs 80 of the retaining 
mechanism 16 will snugly fit within annular recess 42, securing a 
plurality of compartment portions together as a single multiple 
compartment package. 
In one retaining mechanism embodiment, illustrated at 16 in FIG. 4, the 
retaining mechanism 16 also includes a pull tab 86 positioned on the outer 
concentric surface 87 of the retaining mechanism 16. This retaining 
mechanism 16 embodiment conjoins the second compartment portion 14 and the 
first compartment portion 12 as described above. Once this embodiment is 
installed on the multicompartment package 10, a consumer opens the 
multi-compartment package 10, by gripping the pull tab 86 and tearing the 
retaining mechanism 16 concentrically, thereby breaching the integrity of 
the retaining mechanism 16 and the multi-component package 10. Once the 
retaining mechanism 16 is breached, the second compartment portion 14 may 
be removed from its position on the first compartment portion 12. 
The pull tab 86 and the retaining mechanism 16 are preferably constructed 
from a flexible material that provides sufficient strength to retain the 
first compartment portion 12 and the second compartment portion 14 as a 
single, multiple compartment package unit but allows for easy opening when 
the consumer attempts to tear the retaining mechanism 16 by gripping the 
pull tab 86. The retaining mechanism 16 should be made of a material 
having flexibility and strength characteristics that enable the locking 
lugs 80 to snugly fit into position within the annular recess 42 and to 
produce tension when positioning retaining mechanism 16 or when separating 
the first compartment 12 from the second compartment 14. 
In another embodiment of the retaining mechanism illustrated at 88 in FIG. 
5, the shoulder 145 of the upper annular segment 142 of the main body 140 
is of a thickness that meets the lip 50 of the second compartment portion 
14 when engaged in the multiple compartment package 10. The shoulder 145 
and the side annular segment 144 and the locking lugs 80 retain the 
annular shoulder 38 and annular lip 34 of the lid 30 of the first 
compartment portion 12. The locking lugs 80 of the side annular segment 
144 are described above. 
One advantage of this embodiment of the retaining mechanism 88 is that the 
orientation of the second compartment portion 14 with respect to the first 
compartment portion 12 is retained because the shoulder 145 of the 
retaining mechanism 88 contacts the lip 50 of the second compartment 
portion 14 and concurrently, the plurality of locking lugs 80 retain the 
ring to the first compartment portion 12. The snugness of this 
relationship precludes concentric movement of any of the portions 12, 14, 
and 88 of the multi-component package 10. To remove the second compartment 
portion 14 from the first compartment portion 12, a pull tab such as is 
shown at 86 in FIG. 4 may be provided to breach the retaining mechanism 
88. 
Alternately, the materials used to make the retaining mechanism 88 may be 
selected to permit second compartment portion 14 to be pried apart from 
first compartment portion 12. 
The second compartment portion 14 and annular lip 50 are preferably 
constructed as a single unit that includes a cylindrical main body 96, 
illustrated in FIG. 5, using conventional thermoforming techniques. 
However, other plastic fabrication techniques are also suitable. 
Preferably the second compartment portion 14 is constructed in a single 
layer. However, additional material options may be used to provide the 
second compartment portion 14 with specific attributes such as oxygen 
barrier, strength and sealability. Such material options may include 
monolithic or multilayered materials such as produced by, for example, 
coextrusion or adhesive lamination techniques. 
The second compartment portion 14 has a closed first end 52 and an open 
second end 56 as shown in FIG. 1. A circular cap 48 is integrally formed 
into the first end 52 of the main body 46. The main body 46 and the cap 48 
define an inner cavity 54. The annular lip 50 extends outwardly from the 
second end 56 of the main body 46. In one embodiment shown in FIG. 1, the 
diameter of the annular lip 50 is smaller than the diameter of the first 
end 31 of the first compartment portion 12. Thus, the second compartment 
portion 14 can be placed on the lid 30 of the first compartment portion 12 
prior to being secured with the retaining mechanism 16. 
The inner cavity 54 of the second compartment portion 14 is preferably 
filled with a product 62 that is consumed along with a product in the 
first compartment portion 12 but that is not suitable for packaging in 
direct contact with the product in the first compartment portion 12. The 
product 62 is preferably frosting or icing but one in the art will readily 
appreciate that a wide range of products such as gravy, butter, chopped 
nuts or powdered sugar are also suitable for use with a product 62 such as 
dough stored in the first compartment portion 12. 
A closure mechanism 64 is included in the second compartment portion 14 to 
retain the product 62 in the second compartment portion 14 prior to 
consumption. The closure mechanism 64 may be made from a variety of 
flexible materials including roll stock lidding or membrane material. The 
closure mechanism 64 may also be made of inflexible or rigid materials 
such as plastic. The closure mechanism 64 may be affixed to the annular 
lip 50 of the second compartment portion 14 using a variety of methods 
including heat sealing and adhesive seals. 
In one embodiment, the closure mechanism 64 is affixed to the annular lip 
50 by a reclosable seal (not shown) that releasably attaches to the lip 
50. The reclosable seal (not shown) allows the inner cavity 54 to be 
resealed if the product 62 in the inner cavity is not used all at once. 
The reclosable seal (not shown) may include a contact bond adhesive that 
provides a low to medium strength, permanently tacky bond, that contacts 
the lip 50. The closure mechanism may additionally or alternatively 
include a reclosable overcap 66 having a flexible shoulder 67 that 
reversibly snaps over an end 69 of the annular lip 50 as shown in FIG. 5A. 
In another embodiment, the second compartment portion and the retaining 
mechanism may be integrally formed into a single unit 110 as illustrated 
in FIG. 6. The unit 110 includes a second compartment portion 112 having a 
closed end 114, and an open end 117 terminating in an annular lip 116. The 
second compartment portion 112 defines an inner cavity 120. The lip 116 
terminates in a shoulder 124 having an inner surface 125. The lip 116 is 
of a diameter that is greater than the diameter of the first compartment 
portion 12. A plurality of concentrically arranged locking lugs 128 are 
formed integral with the inner surface 125 and retain the unit 110 in 
close relation to the first compartment portion 12 once positioned within 
the recess 42 of the first compartment portion 12. In this embodiment, the 
annular lip 116 is constructed from a material that is sufficiently rigid 
so that the lip 116 does not bend to a degree where locking lugs 128 
release during normal handling when multiple units 110 are stacked for 
shipping. 
In one embodiment, the single unit 110 further includes a peel ring 154, 
contiguous to the lip 116 such as is illustrated in FIG. 9. The peel ring 
154 includes a pull tab 152 and is delineated by a concentric pattern of 
perforations 158 on the lip 116. Preferably, the pattern of perforations 
158 is positioned within an annular segment of the peel ring 154 having a 
thickness that is less than a thickness of the lip 116. The peel ring 154 
also includes the inner surface 125 and locking lugs 128 that retain the 
unit 110 in close relation to the first compartment portion 12 as shown in 
cross-section in FIG. 10. When the peel ring 154 is breached by tearing 
the ring 154 with the pull tab 156 along the pattern of perforations 158, 
tension on the locking lugs 128 is released, the locking lugs 128 are 
displaced and the second compartment 14 is removable from the first 
compartment 12. Peel ring 154 is preferably made of materials having 
suitable strength for holding together first compartment 12 and second 
compartment 14. 
Flipping tab 200 also breaches the integrity of the single unit embodiment 
220, shown in FIG. 13, by tearing the tear region 200B, thereby causing 
the locking lugs 128 to loosen the grip on the first compartment portion 
12. Because the tear region 200B intersects the annular ring 207, the tear 
may be propagated along the annular ring 207 and the thinned region 205, 
thereby removing the tab 200 and annular side segment 206 from the single 
unit 220. 
In the preferred single unit embodiments shown in FIGS. 11 and 12, the 
second compartment portion 14 and retaining mechanism 16 may be 
efficiently and inexpensively made of a single rigid material by a process 
such as injection molding. Because the tab 200 must visibly change 
position to open the package 10, the package is tamper evident. 
Additionally, the retaining mechanism of this preferred embodiment need 
not be removed to separate the first compartment from the second 
compartment, as shown in FIG. 11. 
When it is desired to prevent an introduction of debris into the 
multicompartment container 10 and to prevent movement of the second 
compartment portion 14, a retaining ring embodiment 160, such as is shown 
in FIG. 3 may be included. The embodiment 160 includes an extended 
shoulder 162 of the upper portion 142 extended in a cone shape that 
contacts the second compartment portion 14 at 150. The cone shaped 
shoulder 162 prevents dirt and other debris from resting on the retaining 
ring embodiment 160. By extending the cone shaped shoulder 162 to contact 
the second compartment portion 14, debris is also prevented from 
contacting the first end 31 of the first compartment portion 12. 
One other retaining ring embodiment illustrated at 164 in FIG. 7, includes 
an upper annular ring portion 142 having a shoulder 166 that terminates in 
a foot section 152 that contacts the second compartment portion 14. The 
foot section 152 prevents movement of the second compartment portion 14. 
An additional flexible retaining ring embodiment that restrains movement of 
the second compartment portion 14 is illustrated at 168 in FIG. 8. The 
retaining ring embodiment 168 includes an upper annular ring portion 172 
with a flexible annular ring shoulder portion 170. When installed on the 
multicompartment container 10 the flexible shoulder portion 170 is 
extended downward to contact the second compartment portion 14 so that the 
upper annular portion 172 is held in tension against the second 
compartment portion 14. The second compartment portion 14 is then 
restrained by the force holding the upper annular portion 172 in tension. 
The multicompartment package 10 of the present invention may include many 
different types of first compartment portions and embodiments. For 
instance, in one embodiment, the multi-compartment package 10 may include 
a first compartment portion 12 having a main body 17 that includes a body 
wall 18 which can be laminated. In other embodiments, the first 
compartment portion 12 may include a body wall of a single layer or 
multiple layers. The first compartment portion may have any one of a butt 
joint, spiral seam, no seam or other comparable structure. 
Although the present invention has been described with reference to 
preferred embodiments, workers skilled in the art will recognize that 
changes may be made in form and detail without departing from the spirit 
and scope of the invention.