Patent · US Expired

Method for sealing cavities

US4618467A · kind A · utility

4Cited by

11References

18Claims

0Family size

Assignee

Siemens Aktiengesellschaft · DE

Inventors

Hans-Joachim Burger · Amberg, DE
Hubert Schuster · Rheinfelden (Baden), DE

Key dates

Filing date	Nov 29, 1984
Grant date	Oct 21, 1986
Priority date	—
Expiry date	Nov 29, 2004

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29L2031/3406
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

A method of sealing cavities open on one side, preferably cavities of electrical equipment housings fitted with various components. A measured quantity of an encapsulant, preferably polyurethane foam, is inserted into the cavity. Thereafter the opening is covered by a permeable, absorbent fabric, preferably of polypropylene, which is covered first by an elastic and then a rigid layer. After hardening, the fabric is removed from the surface of the encapsulant.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.