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:
Aug. 04, 1992
Filed:
Mar. 16, 1990
Applicant:
Inventor:
John W Baker, Acton, MA (US);
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
A61B / ;
U.S. Cl.
CPC ...
606173 ; 408206 ; 408225 ;
Abstract
A drill head assembly for a cranial perforator, which assembly is similar to the drill head assembly disclosed in U.S. Pat. No. 4,884,571, except that the configuration of the axially-projecting sections of the front end surfaces of the inner drill are modified to cause the inner drill to stop rotating more quickly upon penetration of the inner drill through a skull.