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. 07, 1998
Filed:
Jul. 09, 1996
Andre Coinon, Le Portel-France, FR;
Zoltan Trajber, Boulogne Sur Mer, FR;
Conte S.A., , FR;
Abstract
In a pencil having a central lead, provided at its top end with an eraser mounted in a ferrule fixed on the body of the pencil, both the ferrule and the peripheral body surrounding the lead are made of thermoplastic materials that are compatible, and the bottom of the ferrule is fixed to the top end of the pencil by localized interpenetration of the thermoplastic materials in at least one ultrasonic weld zone. The material of the peripheral body of the pencil is preferably expanded so as to have a relative density of about 0.5 to 0.6, and the top end of the body includes a setback in which the density has been increased, locally. The ferrule includes a shoulder on the outside face of its bottom, the shoulder being annular in shape and forming an energy director for ultrasonic welding.