Respiratory filter

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Description

FIG. 1 is a rear, bottom, right side perspective view of a respiratory filter showing my new design; and,

FIG. 2 is a front, top, left side perspective view thereof.

Claims

The ornamental design for a respiratory filter, as shown and described.

Referenced Cited
U.S. Patent Documents
D253721 December 18, 1979 Gibeck
D301377 May 30, 1989 Lambert
4976857 December 11, 1990 Solomon
5240479 August 31, 1993 Bachinski
5320096 June 14, 1994 Hans
Patent History
Patent number: D452911
Type: Grant
Filed: Mar 6, 2001
Date of Patent: Jan 8, 2002
Assignee: Pharma Systems PS AB (Knivsta)
Inventor: Curt Danielsson (Knivsta)
Primary Examiner: Ian Simmons
Attorney, Agent or Law Firm: Burns, Doane, Swecker & Mathis, L.L.P.
Application Number: 29/138,022
Classifications
Current U.S. Class: Respirator, Vaporizer, Or Inhalation Tube (4) (D24/110); Filter (37) (D24/162)
International Classification: 2902;