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:
Jul. 04, 2000
Filed:
Jul. 24, 1998
Applicant:
Inventors:
Arnold Jager, D-31303 Burgdorf, DE;
Claudius Jager, Lafayette, CO (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
A63D / ;
U.S. Cl.
CPC ...
473118 ; 473119 ;
Abstract
A method for manufacturing a plastic bowling pin that has a porous core and a resilient envelope includes the step of blow-forming the envelope in a blowing mold and removing the envelope from the blowing mold. The envelope is then cooled to a temperature of 60.degree. C. to 100.degree. C. A core plastic material containing an exothermic agent is then injected into the envelope for forming the core. The core plastic material is heated to a temperature of 200.degree. C. to 260.degree. C. The inner layer of the envelope is thus fused to the plastic material of the core to provide an intimate connection between the envelope and the core.