pH meter

- Hach Company
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Description

FIG. 1 is a top, front and right side perspective view of a pH meter showing my new design;

FIG. 2 is a top plan view;

FIG. 3 is a left side perspective view;

FIG. 4 is a bottom plan view;

FIG. 5 is a right side perspective view;

FIG. 6 is a front elevational view; and

FIG. 7 is a rear elevational view thereof.

Referenced Cited
U.S. Patent Documents
D206004 October 1966 Perkins et al.
D206158 December 1966 Perkins et al.
D211058 May 1968 Neubrech
D212124 August 1968 Feldman
D217101 April 1970 Feldman
D224048 June 1972 Bauer
D226271 February 1973 Holtzman
2546093 March 1951 Gilbert
4090925 May 23, 1978 Jungman
4696189 September 29, 1987 Hochreuther
Other references
  • Transcat, pH/mV/Temperature Meter, 1986, p. 370.
Patent History
Patent number: D312421
Type: Grant
Filed: Sep 4, 1987
Date of Patent: Nov 27, 1990
Assignee: Hach Company (Loveland, CO)
Inventor: Jerry B. Trottmann (Loveland, CO)
Primary Examiner: Nelson C. Holtje
Assistant Examiner: Antoine D. Davis
Attorney: Dean P. Edmundson
Application Number: 7/93,391
Classifications
Current U.S. Class: Chemical (12) (D10/81)