Research/Patents/US 5338605
US 5338605

HOLLOW CARBON FIBERS

Assignee

KETEMA, INC.

Filed

Apr 22, 1991

Granted

Aug 16, 1994

Location

CARSON CITY NV US

Abstract

Hollow carbon and graphite filaments having a specific gravity of about 20-50% less than conventional solid carbon fibers made of the same precursor resin are formed by spinning hollow precursor resin filaments. These low density hollow carbon filaments have improved insulating properties compared with conventional solid carbon fibers and have an excellent bending strength to weight ratio.

Source: Google Patents

35 USC §181 Secrecy Order

Imposed

Aug 28, 1992

Rescinded

Jul 13, 1993

Duration

10 months

Inventor

  • 1ROBERT L. NOLAND

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Back to patent indexSource: USPTO 35 USC §181 secrecy order records