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:
Nov. 21, 1995
Filed:
Apr. 13, 1995
Thomas R Miller, Waynesburg, PA (US);
Daniel C Sheirer, Bedford, PA (US);
Kennametal Inc., Latrobe, PA (US);
Abstract
A roof drill bit having a tool body with a cutting insert brazed thereto. The cutting insert has opposite leading and trailing face portions joined by a side surface which has a leading side relief portion adjacent the leading face portion and a trailing side relief portion adjacent the trailing face portion. The trailing side relief portion, which extends from the leading face portion a distance equal to between about one-third to two-thirds the thickness of the insert, has a greater relief angle that the leading side relief portion, which extends from the trailing face portion a distance equal to between about one-third to about two-thirds the thickness of the insert.