A mold for injection molding a plastic product having a thin-walled area includes a first mold part and a second mold part defining a mold cavity therebetween, encompassed by a parting line, for forming the plastic product, and further defining a gate for admitting injected molten plastic into the cavity....http://www.google.es/patents/US4844405?utm_source=gb-gplus-sharePatente US4844405 - Injection molding of thin-walled plastic products
