Emergency back-up underwater breathing apparatus

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Description

FIG. 1 is a front perspective view of an underwater breathing apparatus showing our new design;

FIG. 2 is an enlarged bottom plan view thereof;

FIG. 3 is an enlarged top plan view thereof;

FIG. 4 is a front view of the device; and

FIG. 5 is a side view of the device.

Referenced Cited
U.S. Patent Documents
D245121 July 19, 1977 Christianson
D246671 December 13, 1977 Cerniway
2931057 April 1960 Vilarem
3045671 July 1962 Updegraff
3776227 December 1973 Pitesky
4019507 April 26, 1977 Oetjen et al.
Patent History
Patent number: D251622
Type: Grant
Filed: Apr 20, 1978
Date of Patent: Apr 17, 1979
Assignee: Larry H. Williamson (Balboa, CA)
Inventors: George E. Garrison (Huntington Beach, CA), James R. Hagadorn (Santa Ana, CA), Joseph Borden (Long Beach, CA), Larry H. Williamson (Balboa, CA)
Primary Examiner: Bernard Ansher
Attorney: Harold C. Weston
Application Number: 5/898,317
Classifications
Current U.S. Class: D29/6
International Classification: D2902;