Drill extension for use in oral implantology

- Aktiebolaget Astra
Description

FIG. 1 is a top, side perspective view of a drill extension for use in oral implantology;

FIG. 2 is a top, opposite side perspective view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a front elevational view thereof; and,

FIG. 5 is a bottom plan view thereof.

Referenced Cited
U.S. Patent Documents
D268615 April 12, 1983 Biggs
D285343 August 26, 1986 Duarte-Martins, Jr.
3449830 June 1969 Weissman
4588381 May 13, 1986 Caracciolo
4820156 April 11, 1989 Ross
Other references
  • "Astra Implant System Components and Instruments", Oct., 1990. "Astra Tech Implant Dental System Components and Instruments", Jun., 1992. "Astra Tech Implant Dental System", Feb., 1992.
Patent History
Patent number: D355487
Type: Grant
Filed: Apr 28, 1993
Date of Patent: Feb 14, 1995
Assignee: Aktiebolaget Astra (Sodertalje)
Inventor: Leif Broberg (Goteborg)
Primary Examiner: Wallace R. Burke
Assistant Examiner: M. H. Tung
Law Firm: White & Case
Application Number: 0/7,641
Classifications
Current U.S. Class: Dental (34) (D24/156)