Pressure equalizing and foam eliminating cap
US5853096A · kind A · utility
Inventors
Key dates
| Filing date | Nov 25, 1996 |
| Grant date | Dec 29, 1998 |
| Priority date | — |
| Expiry date | Nov 25, 2016 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB65D51/1688
- WIPO fieldHandling
- WIPO sectorMechanical engineering
Abstract
The present invention is a pressure equalizing and foam eliminating cap for a container. Pressure equalization and foam elimination is accomplished by designing the cap so that it can be rotated between a fully closed position, a gas venting position and a fully open position. This is accomplished in several ways. A first embodiment includes a spring biased, gas separation membrane between the cap and the mouth of the container. A second embodiment includes a finely, transversely perforated, annular plug on the underside of the cap and a seal between the plug and the interior of the neck. Alternatively, in this embodiment, the perforations may be larger and protected by a gas separation membrane. A third embodiment is similar to the second but incorporates two seals, one above and one below the perforations. In this embodiment also, the perforations may be larger and protected by a gas separation membrane. A fourth embodiment has two annular seals, the outer one being larger and having transverse perforations, depending from the underside of the cap. A fifth embodiment is similar to the second except that the plug is not perforated and the seal has fine, outer, axial grooves or sco…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.