The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 17, 1989
Filed:
Mar. 17, 1988
Francis V Hill, San Diego, CA (US);
Lola E Crosswhite, San Diego, CA (US);
Sorrento Engineer, Inc., National City, CA (US);
Abstract
A method of making high efficiency, flame resistant polyimide foam insulation particularly suitable for insulating plastic pipes and forming ducts. Typically a sheet of polyimide foam which has been foamed unconstrained is placed between opposed caul plates, squeezed to a thickness less than the original thickness and heated to stabilize the new sheet thickness. Face sheets coated with a polyimide adhesive can then be placed against the stabilized foam faces and heated between plates to bond the face sheets to the foam. Also, a sheet of foam which had been impregnated with polyimide resin precursor can be placed against the stabilized sheet and the resin precursor simultaneously cured and the sheet bonded to the stabilized foam. A variety of flat, tubular or other shapes can be made by this method. The resulting insulation panels, tubes or the like have greatly improved flame resistance and excellent thermal insulation characteristics.