Ophthalmic refractor
Latest R. H. Burton Company Patents:
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
Other references
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 |
- 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
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)