Air lock for pressurized chambers

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Description

FIG. 1 is a top perspective view of an air lock for pressurized chambers showing my new design;

FIG. 2 is a side elevational view thereof;

FIG. 3 is a top plan view thereof; and

FIG. 4 is a bottom plan view thereof.

Referenced Cited
U.S. Patent Documents
2927787 March 1960 Maher
3435794 April 1969 Pechaeck
D213956 April 1969 Jones, Jr. et al.
Patent History
Patent number: D245928
Type: Grant
Filed: Oct 2, 1975
Date of Patent: Sep 27, 1977
Inventor: Tormod Frafjord (N-4000 Stavanger)
Primary Examiner: James R. Largen
Attorney: Irvin S. Thompson
Application Number: 5/619,011
Classifications
Current U.S. Class: D31/24
International Classification: D3100;