Over-pressure valve for ventilation

- Oy Kolster Ab
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Description

FIG. 1 is a perspective view taken from the top and one side of an over-pressure valve for ventilation showing my new design; and

FIG. 2 is a perspective view taken from the bottom and side opposite that shown in FIG. 1.

Referenced Cited
U.S. Patent Documents
D206466 December 1966 Hull
D231099 April 1974 Purhonen
D231100 April 1974 Purhonen
D252640 August 14, 1979 Nederman
3140648 July 1964 Bergman et al.
3232208 February 1966 Maassen
3369476 February 1968 Seiz et al.
3459114 August 1969 Baelini
3489073 January 1970 Sauter et al.
3516348 June 1970 Laakkonen et al.
Patent History
Patent number: D261925
Type: Grant
Filed: Sep 21, 1979
Date of Patent: Nov 17, 1981
Assignee: Oy Kolster Ab (Helsinki)
Inventor: Launo Laakkonen (Helsinki)
Primary Examiner: James R. Largen
Law Firm: Cushman, Darby & Cushman
Application Number: 6/78,581
Classifications
Current U.S. Class: D23/151
International Classification: D2304;