Comparator for chemical testing of water

- Aquarium Systems, Inc.
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Description

FIG. 1 is a front elevational view of a comparator for chemical testing of water showing my new design;

FIG. 2 is a rear elevational view;

FIG. 3 is a left side elevational view;

FIG. 4 is a right side elevational view;

FIG. 5 is a top plan view; and

FIG. 6 is a bottom plan view thereof.

Referenced Cited
U.S. Patent Documents
D186271 October 1959 Marks
D232037 July 1974 Hach et al.
D232038 July 1974 Hach et al.
D247821 May 2, 1978 Biersch et al.
1794134 February 1931 Baker et al.
3381572 May 1968 Tuwiner
3604812 September 1971 Walsen
3773425 November 1973 Bentley
Foreign Patent Documents
2742314 March 1979 DEX
Patent History
Patent number: D308833
Type: Grant
Filed: Nov 20, 1986
Date of Patent: Jun 26, 1990
Assignee: Aquarium Systems, Inc. (Mentor, OH)
Inventor: Edmund J. Mowka, Jr. (Mentor, OH)
Primary Examiner: Nelson C. Holtje
Assistant Examiner: Antoine D. Davis
Law Firm: Renner, Otto, Boisselle & Sklar
Application Number: 6/933,100
Classifications
Current U.S. Class: Chemical (12) (D10/81)