Optical refraction testing instrument
Description
FIG. 1 is a perspective view of an optical refraction testing instrument, showing my new design.
FIG. 2 is a front elevational view thereof.
FIG. 3 is a top plan view thereof.
FIG. 4 is a side elevational view as taken from the left hand side of FIG. 2.
FIG. 5 is a bottom plan view thereof.
FIG. 6 is a rear elevational view thereof.
Referenced Cited
U.S. Patent Documents
D207675 | May 1967 | Hermann |
D212647 | November 1968 | Minas |
D213918 | April 1969 | Cohen |
2283769 | May 1942 | Schwanzel |
3778164 | December 1973 | Walker |
Patent History
Patent number: D244483
Type: Grant
Filed: Apr 4, 1975
Date of Patent: May 24, 1977
Assignee: Nerthus, Inc. (Saratoga, CA)
Inventors: John E. Toth (San Diego County, CA), Victor L. Copeland (San Diego County, CA)
Primary Examiner: Bernard Ansher
Attorney: Carl R. Brown
Application Number: 5/565,110
Type: Grant
Filed: Apr 4, 1975
Date of Patent: May 24, 1977
Assignee: Nerthus, Inc. (Saratoga, CA)
Inventors: John E. Toth (San Diego County, CA), Victor L. Copeland (San Diego County, CA)
Primary Examiner: Bernard Ansher
Attorney: Carl R. Brown
Application Number: 5/565,110
Classifications
Current U.S. Class:
D24/8
International Classification: D2401;
International Classification: D2401;