Refractometer

Skip to: Description  ·  References Cited  · Patent History  ·  Patent History
Description

FIG. 1 is a right side elevation of a refractometer, showing my new design;

FIG. 2 is a left side elevation thereof;

FIG. 3 is a front elevation thereof;

FIG. 4 is a rear elevation thereof; and

FIG. 5 is a top plan view thereof.

Referenced Cited
U.S. Patent Documents
D207675 May 1967 Hermann
D210417 March 1968 Hoogesteger
D244483 May 24, 1977 Toth et al.
D246188 October 25, 1977 Jordan
3602580 August 1971 Samuels
3778164 December 1973 Walker
4105302 August 8, 1978 Tate, Jr.
Patent History
Patent number: D253909
Type: Grant
Filed: Jul 8, 1977
Date of Patent: Jan 8, 1980
Assignee: American Optical Corporation (Southbridge, MA)
Inventor: John T. Armbruster (Niagara Falls, NY)
Primary Examiner: Bernard Ansher
Attorney: Howard R. Berkenstock
Application Number: 5/813,909
Classifications
Current U.S. Class: D24/17; D24/8
International Classification: D2401;