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Lawrence Welk, the bandleader who entertained millions of Americans over a generation of broadcasting his TV show, once received a patent: for a music-themed design of an ashtray.
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| Number | Title | Issue Date |
| 7240745 | Drill bit lubrication apparatus and method A lubricating nutating single cone drill bit 10 is disclosed. Bit 10 includes a bit shank 12 with an axially skewed bore 18 rotatably retaining a cutter body 22. A plurality of cutter elements (46, 48) are affixed to the cut... | 07/10/2007 |
| 7104344 | Percussion drilling head Device and method for drilling into geological formations. The device comprises: a rotatable body; drilling cutters arranged on an axial end surface of the rotatable body; a percussion part, which ... | 09/12/2006 |
| 5033558 | Well tool for use with down-hole drilling apparatus A well tool for use in a down-hole drilling assembly wherein the drill bit is rotated without drill pipe rotation comprising a generally tubular body and a plurality of roller assemblies secured to the body, the roller assemblies including rollers which r... | 07/23/1991 |
| 4433738 | Method and apparatus for use when changing the direction of a well bore A method is disclosed of smoothing out a curved section of a well bore that has been drilled with a bent sub-downhole motor assembly. The method includes moving a reamer with a body having a cylindrical section and a lower tapered section equipped with a ... | 02/28/1984 |
| 3945447 | Boring apparatus In boring apparatus of the type having cutters mounted for rotation about respective cutter axes in a frame which is in turn rotatable about a frame axis, each cutter having a body carrying teeth which in operation sweep a surface which is oblique to the ... | 03/23/1976 |
