Patent · US Expired

Foamed fluoropolymer articles having low loss at microwave frequencies and a process for their manufacture

US4560829A · kind A · utility

25Cited by

5References

20Claims

0Family size

Inventors

Donald A. Reed · Menlo Park, US
Hans E. Lunk · Menlo Park, US

Key dates

Filing date	Jul 12, 1983
Grant date	Dec 24, 1985
Priority date	—
Expiry date	Jul 12, 2003

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T29/49123
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

Foamed polymers having low loss at microwave frequencies are prepared through use of perfluorinated alkane foaming agents. The invention is particularly valuable for polymers which are melt-processed at high temperatures, especially fluoropolymers such as tetrafluoroethylene copolymers. The polymeric foams are particularly useful as electrical insulation, especially for coaxial cables suitable for use at microwave frequencies.

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