Patent ID: 7418782

Claim:
A method of manufacturing a gas storage tank for storing a gas, said manufacturing method comprising: providing a hollow filling unit and a metal outer wall member that is configured to receive said filling unit therein; filling said filling unit with a gas absorbent/adsorbent for absorbing and/or adsorbing the gas; attaching a detachable cover member to said filling unit to block up an opening of said filling unit filled with the absorbent/adsorbent, and placing said filling unit filled with the absorbent/adsorbent in said outer wall member through an opening formed in said outer wall member; narrowing the opening of said outer wall member after the placement of said filling unit in said outer wall member; heat-treating said outer wall member with the narrowed opening followed by water cooling to improve the fatigue strength of said gas storage tank; and detaching and removing the cover member from said filling unit housed in said outer wall member after the heat treatment, and connecting said filling unit with a supply of gas via the narrowed opening of said outer wall member, so as to allow for storage and release of the gas into and from the absorbent/adsorbent.