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:
Dec. 31, 1991
Filed:
Nov. 01, 1990
Ronald J Weetman, Rochester, NY (US);
Walter C Webster, Brockport, NY (US);
General Signal Corporation, Stamford, CT (US);
Abstract
A method of injection molding a thermoplastic material around a two-piece insert having a rotational axis through which a bore passes is disclosed. The insert is formed from two pieces which are axially spaced to define an annular gate through which the injected thermoplastic material passes radially outward. This technique is particularly useful for forming mixing impellers, because it orients fibers contained within the thermoplastic material in a radially outward direction within the impeller's blades to provide increased strength. The insert also allows improved performance for injection molding parts by reducing their cross-sectional thickness to optimal values. The insert also allows machining the bore without harming the injected plastic material.