U.S. patent number D519,136 [Application Number D/208,314] was granted by the patent office on 2006-04-18 for swivel body for a top drive in a wellbore derrick. This patent grant is currently assigned to Varco I/P, Inc.. Invention is credited to Robert Alden Folk, Steven Lorne Folk.
United States Patent | D519,136 |
Folk , et al. | April 18, 2006 |
Inventors: | Folk; Robert Alden (Calgary, CA), Folk; Steven Lorne (Sherwood Park, CA) |
---|---|
Assignee: | Varco I/P, Inc. (Houston,
TX) |
Appl. No.: | D/208,314 |
Filed: | June 24, 2004 |
Application Number | Filing Date | Patent Number | Issue Date | ||
---|---|---|---|---|---|
10862787 | Jun 7, 2004 | ||||
Current U.S. Class: | D15/140 |
Current International Class: | 1509 |
Field of Search: | ;D15/140 ;166/70,154-156,177.4,285,75.14,76.1,90.1,92.1,97.5,250.1,193,78.1,291,77.52 ;173/44 ;175/85,267,40,65 |
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An Overview of Top-Drive Drilling Systems Applications and Experiences, G.I. Boyadjieff, IADC/SPE 14716, 8 pp. 1986. cited by other . Varco Pioneers AC Top Drive, Engineering Award Winners, AC Top Drive Technology Update #1, Hart's Petroleum Engineer, 4 pp., Apr. 1997. cited by other . Challenger Rig & Mfg., Inc., Doghouse, Composite Catalog 1982-83, p. 1984-C, 1982. cited by other . AC Top Drive Technology Update #2, Varco Systems, 1 p. Prior to 2002. cited by other . Top Drive Drilling System TD 500 PAC Variable Frequency AC Top Drive, National Oilwell, 6 pp., 2002. cited by other . 1000 Ton AC Top Drive--TDS--1000, Varco Systems, 2 pp., 2002. cited by other . 750 Ton DC Top Drive TDS--45, Varco Systems, 2 pp., 2002. cited by other . 500 Ton DC Top Drive IDS--1, Varco Systems, 2 pp., 2002. cited by other . Varco's Top Drive Systems are advancing the technology of drilling, Varco Systems, 8 pp., 2001. cited by other. |
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