No Spills, No Waste A Simple Linking Device That Transfers Liquid Between Containers Using Negative Pressure

Two Australian inventors have patented a practical container assembly that makes it easy and mess-free to transfer liquids from one container to another – using a linking structure and a piston-and-stem mechanism that draws liquid through negative pressure without requiring pumps, electricity or complex apparatus. The invention has everyday applications in food preparation, beverages, cleaning products and any context where controlled liquid transfer is needed.

The Problem

Transferring liquid from one container to another is a task that sounds trivial but routinely involves spillage, waste and frustration in practice. Pouring from large or heavy containers is difficult to control precisely; tipping bottles risks splashing; siphoning requires unpleasant mouth contact with a tube; and most mechanical pump systems are either expensive, complex or difficult to clean. For applications involving food-grade liquids, medicines or other products where contamination must be avoided, the problem is compounded by hygiene requirements.

The challenge is particularly acute when the “donor” container – the one being emptied – is sealed or near-sealed, as is the case with bottles, jars and other common consumer packaging. Getting the liquid out cleanly, completely and without contamination requires either decanting (which risks exposure) or some form of controlled transfer device.

What is needed is a simple, practical mechanism that can couple a donor container to a recipient container and transfer liquid cleanly, using only the mechanical advantage of negative pressure generated by the user – without requiring an intermediate vessel, a pump or external power.

What This Invention Does

The Bree sisters’ invention comprises a container assembly with a linking structure that connects a donor container to a recipient container. The recipient container has a piston coupled to its sidewall in a watertight configuration, able to move linearly within the container cavity.

A stem member attaches to the piston and provides a grasping portion for the user. A straw member extends from the linking structure into the donor container. When the user pulls the stem (and thus the piston) outward, it creates a negative pressure – suction – within the enclosed conduit connecting the two containers. This negative pressure draws liquid from the donor container through the straw, through the linking structure and into the recipient container, all in a sealed, watertight configuration.

The assembly connects the donor and recipient containers in a watertight male-female coupling configuration, preventing spills during transfer. The entire system can be operated with one hand, requires no electricity and can be sized and configured for a wide range of liquid types and container formats.

Key Features

Negative pressure transfer mechanism. A piston driven by a hand-pulled stem creates suction that draws liquid from the donor container without requiring pumps, electricity or gravity – giving the user direct mechanical control of the transfer process.

Watertight coupling throughout. The linking structure and piston-to-sidewall connections are all configured in watertight arrangements, preventing leakage or spillage during the transfer process.

Male-female connector architecture. Both the container-to-linking-structure connection and the stem-to-piston connection use male-female coupling configurations, providing secure, repeatable attachment and disconnection without complex fasteners.

No intermediate vessel required. Liquid transfers directly from donor to recipient without needing to be decanted into an intermediate container, reducing waste, contamination risk and handling steps.

Simple single-user operation. The grasping portion of the stem allows one-handed operation, making the device accessible and practical for everyday use across a wide range of applications.

Who Is Behind It?

The applicants and inventors are Anne Marie Bree and Elizabeth Marie Bree – an Australian mother-daughter or sister team filing jointly as individual inventors and applicants. This application is a divisional of AU 2022343098. The application is managed by Wynnes Patent and Trade Mark Attorneys Pty Ltd in Bulimba, Queensland.

Why It Matters

Simple, practical inventions that solve everyday problems cleanly and without complexity have enduring commercial appeal. The liquid transfer market is large and fragmented – encompassing everything from kitchen oil dispensers and beverage containers to cleaning products, automotive fluids and laboratory supplies. A well-designed, affordable transfer device that works reliably across container types could find broad consumer and commercial uptake.

The invention is particularly relevant in the context of growing interest in reusable, refillable packaging as part of a broader shift toward reducing single-use plastic. A device that makes it genuinely easy to transfer liquid from a bulk container into a smaller reusable container addresses a practical friction point that has slowed adoption of refill systems. With IPC classifications covering container closures (B65D 51/28, B65D 77/06) and liquid dispensing (B67D 7/02, B67D 7/54), the patent covers the key technical elements of the transfer system.

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AU 2026201535 was published in the Australian Official Journal of Patents on 19 March 2026 and is open for public inspection. Patent applications represent inventions that are sought to be protected and do not necessarily reflect commercially available products.