Pressure indicating feature for replaceable container caps
US7568587B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 8, 2004 |
| Grant date | Aug 4, 2009 |
| Priority date | — |
| Expiry date | May 19, 2025 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D81/2053
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
An improved cap, and apparatus and a method for making such cap, including tooling for the first station are provided. The improved cap has a central button feature in its top panel that can move slightly upward or downward with respect to the remainder of the cap. When a container is filled, liquid Nitrogen is added just before the cap is applied. The liquid Nitrogen turns into gas and creates pressure in the container, causing the button to rise. When a consumer opens the cap, the gas is released and the button returns to its normal (down) position, or if pressure is accidentally lost the button returns to its normal (down) position. Thus indicating loss of pressurization and possible resulting spoilage, or will indicate that the container has been open, and may contain only partial product.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.