Dispensing – Collapsible wall-type container – Plural container and/or compartment
Reexamination Certificate
2000-05-12
2001-07-17
Derakshani, Philippe (Department: 3754)
Dispensing
Collapsible wall-type container
Plural container and/or compartment
C222S541900
Reexamination Certificate
active
06260735
ABSTRACT:
FIELD OF THE INVENTION
This Invention relates to a dual chamber sachet that substantially uniformly dispenses the substances from each chamber when the sidewalls of the sachet are depressed. More particularly, this invention relates to a construction of a dual chamber sachet that provides for the uniform dispensing of the substances stored in each chamber of the dual sachet.
BACKGROUND OF THE INVENTION
Sachets are small packets that are used for supplying small doses of a product. These are used to dispense single or a small number of doses of adhesives, lubricants, medicines, cosmetics, shampoos, conditioners, liquid soaps, lotions and dentifrices. In some instances a single dose is a sample amount. Regardless such sachets are commonly used to deliver a single dose of a substance.
In most instances the sachets will be used to deliver a single dose of a single substance. However, in some instances they will be used to dispense doses of two different substances. Further, in most instances in the delivery of two different substances, these substances must be delivered substantially uniformly. That is, each of the substances should be dispensed in about equal amounts. This is needed for the effective use of the substances being dispensed. When the substances are components of an adhesive they are reactive and must be dispensed and used in a certain reactive ratio. Medications also must be used in a certain ratio. The same is the case for a dentifrice that is comprised of two non-compatible components. These types of substances need sachets that will reliably dispense the substances from each chamber in substantially uniform amounts. The present sachet is directed to solving this problem.
BRIEF SUMMARY OF THE INVENTION
The present dual chamber sachet has a construction to facilitate the uniform dispensing of substances. The sachet is comprised of a front wall, a rear wall and an intermediate divider wall. The peripheral edges of a first and second side edge and of a lower and upper edge of the walls are bonded together to provide a container with two separate chambers. The chambers have rounded corners at a lower end of each chamber and in an upper part of each chamber sidewalls which taper to a tapered exit channel. The exit channel has less of a taper than the upper part of the chamber sidewalls. The exit channel extends a distance from the top of the chambers. The exit channel will have a notch adjacent the product chambers for the removal of a part of the exit channel and to thereby open the exit channel at about the commencement of the exit channel.
The chambers of the sachet are sized so that the width of a person's thumb will extend across a substantial portion of the width of the sachet. This in combination with an orifice that is about 75% to 100% the width of a toothbrush, and about 35% to 65% of the width of the product chambers, provides for a uniform dispensing from the sachet. In addition, the sachet opens at about the commencement of the tapered wall exit channel. This provides for a comparatively wide exit opening for the more uniform delivery of the products from each of the chambers of the sachet. Further, the sachet is symmetrical about a vertical plane through the peripheral edges of the sachet.
The intermediate divider wall will have a thickness of about 10% to about 70% of that of either the front wall or rear wall, and preferably about 25% to about 50%. Further, the intermediate divider wall will have good barrier properties and will contain a film such as one selected from the group comprising polyethylene terephthalate, polypropylene, biaxially oriented polypropylene, metal foils, polyethylene, low density polyethylene, ethylene vinyl acetate copolymers, ethylene vinyl alcohol copolymers and polyacrylonitrile/styrene polymer resins. The front and rear walls will be comprised of a film selected from the same polymers and copolymers. These will be used primarily in various laminate structures.
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Colgate-Palmolive Company
Derakshani Philippe
McGreal Michael J.
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