Sealed container housing a mechanical filter
US3953662A · kind A · utility
4Cited by
4References
3Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 30, 1974 |
| Grant date | Apr 27, 1976 |
| Priority date | — |
| Expiry date | Dec 30, 1994 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH03H9/50
- WIPO fieldBasic communication processes
- WIPO sectorElectrical engineering
Abstract
A container for a mechanical filter is provided in which the internal pressure is reduced to prevent propagation in the air of sound waves to thereby prevent deterioration of the filter characteristics. A recess with an aperture therethrough is formed in one of the walls of a metal casing which constitutes the container. Further, an adhesive tape-like member is disposed on the surface of the recess in such a manner as to cover the aperture. After the casing has been evacuated through the aperture, hermetic sealing means is provided on the adhesive tape-like member within the recess.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.