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:
Aug. 17, 1976
Filed:
Mar. 04, 1974
Applicant:
Inventors:
Joseph Redmond Farnand, Ottawa, CA;
Ira Edwin Puddington, Ottawa, CA;
Assignee:
Canadian Patents and Development Limited, Ottawa, CA;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
B22F / ; B22F / ; B29D / ;
U.S. Cl.
CPC ...
75222 ; 65 18 ; 106 41 ; 252463 ; 2524 / ; 264 12 ; 264 13 ; 264 44 ; 264 49 ; 264344 ;
Abstract
Hollow articles, in particular microballoons, hollow fibers and other shapes, are prepared by dispersing or dissolving a soluble film-forming solid in a core solvent which is normally solid but transformable slowly to gas, shaping the blend while molten, cooling to solidify and slowly removing the solid core material as a gas. The film-forming solid migrates to form a shell having the original core shape and a non-uniform cross-section of an outer skin and an inner sponge lining.