Well drilling rig

• US 2,628,818 A
• Filed: 05/16/1949
• Issued: 02/17/1953
• Est. Priority Date: 05/16/1949
• Status: Expired due to Term

• Current Assignee: Graham, Tom S.
• Original Assignee: Graham, Tom S.
• Inventors: Graham, Tom S.
• Application Number:
  US03/093,514
• Time in Patent Office: 1,373 Days
• US Class Current: 175/9
• CPC Class Codes: E02B 17/027 steel structures E02B17/021 takes precedence
• CPC Class Codes: E21B 15/003 adapted to be moved on their substructure, e.g. with skidding means; adapted to drill a plurality of wells
• CPC Class Codes: E21B 19/143 specially adapted for underwater drilling

Claims