Patent · US Expired

Diaphragm for loudspeaker

US4487877A · kind A · utility

2Cited by
7References
2Claims
0Family size

Assignee

Inventors

Key dates

Filing dateSep 30, 1982
Grant dateDec 11, 1984
Priority date
Expiry dateSep 30, 2002

Classification

  • Technology area (CPC H)Electricity
  • CPC primaryH04R7/02
  • WIPO fieldAudio-visual technology
  • WIPO sectorElectrical engineering

Abstract

A speaker diaphragm comprises a composite film prepared by combining a reinforcing material such as a mica, a needle or fiber filler, or talc, with a polybisphenol phthalate resin consisting of an aromatic dicarboxylic acid and a dihydric phenol.

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