MR. JUSTICE BUTLER delivered the opinion of the Court.
This suit presents questions of validity and infringement of Patent No. 1,930,987 applied for February 10, 1926 by Simmons and, after assignment, issued October 17, 1933, to Halliburton. It is for a method and apparatus for testing productivity of formations encountered in oil and other deep wells drilled by the rotary method.
The writs were granted, on petition of defendants Honolulu Oil Corporation,...
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