Refractometer
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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
Other references
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. |
- 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
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
Classifications