PH meter

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Description

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

FIG. 2 is a bottom plan, rear, and right side perspective view; and

FIG. 3 is a top plan, front, and left side perspective view of another embodiment of FIGS. 1 and 2 thereof.

Referenced Cited
U.S. Patent Documents
3294662 December 1966 Matlow
4154659 May 15, 1979 Zetter
4461998 July 24, 1984 Kater
4490235 December 25, 1984 Calzi
Other references
  • Transeat, pH/mV/Temperature Meter, 1986, p. 373, found in (A.U. 293) Ex. Davis Library.
Patent History
Patent number: D309867
Type: Grant
Filed: Sep 16, 1987
Date of Patent: Aug 14, 1990
Assignee: Beckman Instruments, Inc. (Fullerton, CA)
Inventor: Ronald C. Johnson (Fullerton, CA)
Primary Examiner: Nelson C. Holtje
Assistant Examiner: Antoinc D. Davis
Attorneys: William H. May, Paul R. Harder
Application Number: 7/97,466
Classifications
Current U.S. Class: Chemical (12) (D10/81)