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:
Mar. 23, 1999
Filed:
Jun. 27, 1997
James W Hendry, Brooskville, FL (US);
Melea Limited, Gibraltar Hts., GI;
Abstract
A method and system for injection molding plastic articles which utilize a spill area whose volume varies within an article-defining mold cavity. In one embodiment, the volume increases during introduction of pressurized gas into the mold cavity. In another embodiment, the volume of the spill area varies during a plastic injection which fills the mold cavity. A core reciprocally mounted within the mold cavity partially defines the variable volume of the spill area. An air spring is utilized to control pressure on the core which counters the pressure of the plastic at an end face of on the core. In one embodiment, the end face of the core is non-flat to create an area where fluid plastic can exert pressure against the end face within the mold cavity during plastic injection and/or during introduction of pressurized gas.