Sound level meter

- Donaldson Company, Inc.
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Description

FIG. 1 is a bottom, left front perspective view of a sound level meter showing our new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a rear elevational view thereof;

FIG. 4 is a right side elevational view thereof.

Referenced Cited
U.S. Patent Documents
D215238 September 1969 Seidel
D229968 January 1974 Williams
D242531 November 1976 Guimond
Other references
  • Industrial Equip. News, 2/75, p. S-33, Sound Level Meter at top right. Industrial Design, 6/74, p. 61, Elec. Thermometer at top.
Patent History
Patent number: D247161
Type: Grant
Filed: Jan 30, 1976
Date of Patent: Feb 7, 1978
Assignee: Donaldson Company, Inc. (Minneapolis, MN)
Inventors: Mario F. Fernandez (Minneapolis, MN), Bruce J. Rubin (Minneapolis, MN)
Primary Examiner: Nelson C. Holtje
Attorney: Ralph F. Merchant
Application Number: 5/653,653
Classifications
Current U.S. Class: Measuring, Regulating Or Indicating Instrument, Or Casing (D10/46)
International Classification: D1004;