Hardness tester

- Instron Corporation
Skip to: Description  ·  References Cited  · Patent History  ·  Patent History
Description

FIG. 1 is a perspective view of the hardness tester of this invention;

FIG. 2 is a front view of the hardness tester of this invention;

FIG. 3 is a left side view of the hardness tester of this invention;

FIG. 4 is a right side view of the hardness tester of this invention;

FIG. 5 is a top view of the hardness tester of this invention; and,

FIG. 6 is a bottom view of the hardness tester of this invention.

The rear view of the hardness tester of this invention does not form an ornamental aspect of the design of this hardness tester.

The broken line showing is for illustrative purposes only and forms no part of the claimed design.

Referenced Cited
U.S. Patent Documents
D250514 December 12, 1978 Etchison
D283599 April 29, 1986 Biddle, Jr. et al.
D351804 October 25, 1994 Kellstedt, Jr. et al.
5616857 April 1, 1997 Merck, Jr. et al.
Patent History
Patent number: D394015
Type: Grant
Filed: Mar 21, 1997
Date of Patent: May 5, 1998
Assignee: Instron Corporation (Canton, MA)
Inventors: Charles W. Kellstedt, Jr. (Sudbury, MA), Joel M. Lieblein (Sudbury, MA)
Primary Examiner: Antoine Duval Davis
Law Firm: Levisohn, Lerner, Berger & Langsam
Application Number: 0/68,523
Classifications
Current U.S. Class: Weight, Force Or Density (D10/83); Measuring, Regulating Or Indicating Instrument, Or Casing (D10/46)
International Classification: 1004;