Does United Australian Oil Inc still exist?

My grandfather owned shares in United Australian Oil Inc. and Australian Oil Corporation. A letter was written to him March 28, 1984, from Frank E. Snell, Chairman of International Energy Company of America (new company name) of Dallas, Texas, regarding his shares. The letter also mentions International Energy holding shares of Common Stock of New Zealand Petroleum Exploration Company. With the low value of stock at that time shareholders were encouraged to donate their shares to the American Heart Association. Also, Mr. Snell indicates the company has not actively engaged in business since 1975. The final paragraph states, "The Company presently holds 11,000 shares of New Zealand Petroleum Exploration Company Common Stock and 1 1/2% overriding royalty in approximately 35,000 acres of coal leases (non-producing) which were sold to Mobil in 1973."