Ventilatory instrument for measuring peak expiratory flow

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Description

FIG. 1 is a front elevational view of a ventilatory instrument for measuring peak expiratory flow showing our new design;

FIG. 2 is a rear elevational view thereof;

FIG. 3 is a right side elevational view thereof, the left side elevational view being a mirror image;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof.

Referenced Cited
U.S. Patent Documents
D325634 April 21, 1992 Sweeney, Jr.
2892348 June 1959 Ekstrom, Jr.
3367324 February 1968 De Bono
3857277 December 1974 Moore
3946726 March 30, 1976 Pikul
3955415 May 11, 1976 Sharon
4041935 August 16, 1977 Garbe
4638812 January 27, 1987 Hakkinen
4787627 November 29, 1988 Daubenspeck
5137026 August 11, 1992 Waterson et al.
Foreign Patent Documents
8906275 August 1977 DEX
WO84/02642 August 1984 WOX
WO89/02065 August 1989 WOX
Patent History
Patent number: D333004
Type: Grant
Filed: Sep 28, 1990
Date of Patent: Feb 2, 1993
Assignee: Ferraris Development and Engineering Company Limited (London)
Inventors: George A. McNamee (Saffron Walden), James A. Stockwell (London), Ronald F. Checksfield (London)
Primary Examiner: Alan P. Douglas
Assistant Examiner: Antoine D. Davis
Law Firm: Nixon & Vanderhye
Application Number: 7/589,891
Classifications
Current U.S. Class: Pulmonary (38) (D24/164)