Research/Patents/US 5484277
US 5484277Tier 1 — UAP Program Assignee

MANDRELESS MOLDING SYSTEM

Assignee

McDonnell Douglas

Filed as: MCDONNELL DOUGLAS CORPORATION

Filed

Dec 26, 1989

Granted

Jan 16, 1996

Location

MESA AZ US

Abstract

A tool for fabricating fiber reinforced resin matrix composite structures having molded outside surfaces with intermittent molded inside surfaces e.g. aircraft skin with internal stiffeners. The tool employs a hybrid vacuum bag with soft portions in combination with rigid portions to produce the internal stiffeners. The stiffeners are supported and shaped during curing by pressurized elastomeric tubes, in lieu of mandrels, which can be easily removed when collapsed. The stiffeners and skin can be made from wet lay-ups or prepregs, formed in place or preformed, and in combinations where one part is precured or both parts are co-cured.

Source: Google Patents

35 USC §181 Secrecy Order

Imposed

Sep 13, 1990

Rescinded

Jul 13, 1993

Duration

2 years, 10 months

Inventor

  • 1WILLIAM E. LINDSAY

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