Air stone

- Willinger Bros., Inc.
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Description

FIG. 1 is a perspective view of an air stone, showing my new design;

FIG. 2 is a top plan view;

FIG. 3 is a rear elevational view;

FIG. 4 is a right side elevational view; and

FIG. 5 is a bottom plan view.

Referenced Cited
U.S. Patent Documents
3507253 April 1970 Willinger
3524430 August 1970 Willinger
3575350 April 1971 Willinger
Patent History
Patent number: D249897
Type: Grant
Filed: Jul 15, 1977
Date of Patent: Oct 10, 1978
Assignee: Willinger Bros., Inc. (New York, NY)
Inventor: Allan H. Willinger (New York, NY)
Primary Examiner: James R. Largen
Attorney: Abraham Friedman
Application Number: 5/816,071
Classifications
Current U.S. Class: D30/12
International Classification: D3099;