Gas-permeable, liquid-tight closure
US3951293A · kind A · utility
65Cited by
5References
14Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Jan 21, 1975 |
| Grant date | Apr 20, 1976 |
| Priority date | — |
| Expiry date | Jan 21, 1995 |
Classification
- Technology area (CPC F)Mechanical Engineering; Lighting; Heating
- CPC primaryF16L55/1152
- WIPO fieldMechanical elements
- WIPO sectorMechanical engineering
Abstract
A gas-permeable liquid closure for containers of liquids or solids which emit or absorb gas is provided by a film of an unsintered tetrafluoroethylene having a thickness of from about 0.1 to 3 mm., a fibrillated structure and a density of less than about 1.4. The film is supported across an opening of the container by a perforated cap or perforated sealing diaphragm which is disposed on either one or both sides of the film.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.