Refractometer

Description

FIG. 1 is a perspective view of a refractometer showing my new design;

FIG. 2 is a right side elevational view;

FIG. 3 is a front elevational view;

FIG. 4 is a left side elevational view;

FIG. 5 is a rear elevational view;

FIG. 6 is a top bottom view; and,

FIG. 7 is a bottom plan view thereof.

FIG. 1 has been drawn on a slightly reduced scale with respect to FIGS. 2-7 .

Referenced Cited
U.S. Patent Documents
D138401 August 1944 Stegeman
D285485 September 2, 1986 Kahute
D296004 May 31, 1988 Kahute
D316144 April 9, 1991 Nishimura
D320077 September 17, 1991 Koizumi
4571842 February 25, 1986 Ikezawa et al.
Other references
  • Nidek Autorefractometer Model:AR-1100, Nidek Co., Ltd, undated, pp. 1-4. Canon Auto Ref R-22, Canon Inc., undated, pp. 1-6. Topcon Auto-Refractometer RM-A2000, Tokyo Optical Co., Ltd, 1988 ?, pp. 1-6.
Patent History
Patent number: D327024
Type: Grant
Filed: Jun 22, 1990
Date of Patent: Jun 16, 1992
Assignee: Essilor International (Compagnie Generale d'Optique) (Creteil)
Inventor: Francois Elie (Paris)
Primary Examiner: Donald P. Walsh
Assistant Examiner: Antoine D. Davis
Law Firm: Young & Thompson
Application Number: 7/542,416