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Process for manufacturing a toothbrush
   
Document Number
US Patent 7118364
Issued Date
October 10, 2006
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Abstract
A process for manufacturing hollow handled toothbrushes is disclosed. The process includes; a) providing a toothbrush mold having a head portion, a base portion, a toothbrush cavity located between said head and end portions and having walls, an injection port for molten plastic, and a gas injection port, wherein the gas injection port is positioned in the end of the base portion of the mold so that gas is injected into the mold cavity substantially centrally thereof and in a direction parallel to the longitudinal axis of the mold; b) injecting a predetermined amount of a molten plastic into the mold cavity to partially fill the cavity; and c) injecting at least one gas through the gas injection port into the cavity to direct the molten plastic against the walls of the mold cavity.
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Number of Claims:
2
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Published
October 10, 2006
Application Number
10/722,785
Filed
November 26, 2003
US Classification
425/130   264/572
Int'l Classification
B29D   22/00   (20060101)  
Parent Case
CROSS REFERENCE TO RELATED APPLICATIONS This is a continuation of application Ser. No. 10/101,126, filed Mar. 19, 2002 U.S. Pat. No. 6,818,174, which is a continuation of application Ser. No. 09/740,741, filed Dec. 19, 2000, now abandoned.
USPTO Field of Search
264/572   425/130  
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