Method of producing internal screw threads, especially in metals or their alloys

US6460601B1 · kind B1 · utility

Assignee

• Bredent Dentalgerate und Materialien Fach-und Organisationsberatung Peter Brehm · DE

Inventor

• Peter Brehm · Unterschleißheim, DE

Key dates

• Filing date: Apr 13, 2000
• Grant date: Oct 8, 2002
• Expiry date: Apr 13, 2020

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B22D19/009
• WIPO field: Medical technology
• WIPO sector: Instruments

Abstract

A method of producing internal screw threads, especially in metals or their alloys and preferably in high strength alloys as are used, inter alia, in dental prosthetics, especially employing the casting technique. Initially an externally threaded pin is positioned in a mold cavity at the location in the dental prosthetic article required for the internal thread. The molten metal is cast around this metal pin and, after hardening of the molten metal, is removed to leave an internal screw thread.