The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 10, 1976
Filed:
Oct. 16, 1974
Applicant:
Inventors:
John Richard Armstrong, Vancouver, CA;
Denis John Marshall, Ware, EN;
Assignee:
BOC International Limited, London, EN;
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
B23K / ;
U.S. Cl.
CPC ...
228 57 ; 228218 ;
Abstract
Underwater welding apparatus including a welding chamber and at least one source of gas under pressure connected to the welding chamber through a demand valve, in which the demand valve allows the flow of gas to the chamber to increase as the increase in the hydrostatic head causes the pressure of the gas in the chamber to increase, and to decrease as the hydrostatic head decreases.