Combustible gas indicator

- J and N Associates, Inc.
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Description

FIG. 1 is a top, front and left side perspective view of a combustible gas indicator showing my new design;

FIG. 2 is a front elevational view;

FIG. 3 is a top plan view;

FIG. 4 is a rear elevational view;

FIG. 5 is a bottom plan view;

FIG. 6 is a left side elevational view; and,

FIG. 7 is a right side elevational view thereof.

Referenced Cited
U.S. Patent Documents
D238887 February 1976 O'Neal et al.
D296823 July 19, 1988 Kuwa et al.
4765193 August 23, 1988 Holden et al.
4779446 October 25, 1988 Rowland
Other references
  • Lumidor Safety Products, "Gas-Pro," advertising sheet (Aug. 1980). "GasTech," advertising sheet (Undated). "Enerac," advertising sheet (Undated). "GMI," advertising sheet (Undated). "AIM Gas Detectors," advertising sheet (Undated). Dynamation, Inc., "CGM 947," advertising sheet (Undated). GC Industries, "GC Industries," advertising sheet (Undated). "Matheson TECH/Brief," advertising sheet TB-240 (Undated). Biosystems Inc., "PhD," advertising sheet (Undated). Bacharach, "Sentinel 4," advertising sheet (Undated). MDA, "MSTox8600," advertising sheet (Undated). Ion Science, "Gas Check," advertising sheet (Undated). Compur, "Monitox," advertising sheet (Undated).
Patent History
Patent number: D330521
Type: Grant
Filed: Oct 11, 1990
Date of Patent: Oct 27, 1992
Assignee: J and N Associates, Inc. (Wheeler, IN)
Inventor: Rudy Krolopp (Elk Grove, IL)
Primary Examiner: Nelson C. Holtje
Assistant Examiner: Antoine D. Davis
Law Firm: Marshall, O'Toole, Gerstein, Murray & Bicknell
Application Number: 7/595,930