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:
Mar. 21, 1978
Filed:
Nov. 17, 1975
Andreas Maier, Schwendi-Horenhausen, DT;
Hartmetallwerkzeugfabrik Andreas Maier KG, Horenhausen, DT;
Hawera Probst GmbH & Co., Ravensburg, DT;
Abstract
A drill for electronic conductor plates with a cylindrical drill head which is arranged at the front end of a shank, and which in particular has a working diameter of from 0.5 to 1.2 mm. The rear end of the cylindrical drill head is in the direction toward the drill shank followed by a first shank section of a shorter outer diameter. The drill head and the next following first shank section comprise guiding passages for the drilled out material, especially continuous helical grooves in the manner customary with spiral drills. The drill is characterized primarily in that the first shank section adjacent the drill head conically tapers from the rear end of the drill head in the direction toward the rear end of the drill shank.