Ophthalmic refractor

- R. H. Burton Company
Description

FIG. 1 is a rear perspective view of a ophthalmic refractor showing our new design;

FIG. 2 is a front view thereof, the broken line showing of the details is for illustrative purposes only and forms no part of the claimed design;

FIG. 3 is a rear view thereof;

FIG. 4 is a top view thereof;

FIG. 5 is a right side elevational view thereof;

FIG. 6 is a left side elevational view thereof; and,

FIG. 7 is a bottom view thereof.

Referenced Cited
U.S. Patent Documents
D114487 April 1939 Peck
2266797 December 1941 Peck et al.
2938426 May 1960 Armbruster et al.
2968213 January 1961 Wright et al.
2995065 August 1961 Wright et al.
3498699 March 1970 Wilkinson
4606624 August 19, 1986 Wood
4943162 July 24, 1990 Sims
Other references
  • Bausch and Lomb Optical Company "Greens' Refractor" Aug. 19, 1955 Cover Page. American Optical Ophthalmic Instruments "Refractor" @ 1979 p. 4.
Patent History
Patent number: D344587
Type: Grant
Filed: Mar 6, 1991
Date of Patent: Feb 22, 1994
Assignee: R. H. Burton Company (Grove City, OH)
Inventors: Roy H. Burton (Columbus, OH), David E. Wood (Grove City, OH), Robert G. Miller (Groveport, OH)
Primary Examiner: A. Hugo Word
Assistant Examiner: Ian Simmons
Law Firm: Mueller and Smith
Application Number: 7/665,453
Classifications
Current U.S. Class: Ophthalmic (44) (D24/172)