Did You Know...
...that to encourage use of his new invention, the shopping cart, market owner Sylvan Goldman hired fake shoppers to push the carts around his store in Oklahoma City? Seems his customers were reluctant to give up their hand-carried baskets.
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| Number | Title | Issue Date |
| 7153119 | Apparatus for extruding food dough An extruding apparatus for food materials having a filling material and a wrapping material extrudes and envelops the filling material with the wrapping material. An internal cylinder supplies the filling material while a concentrically arranged external cylinder cr... | 12/26/2006 |
| 5031696 | Casing hanger and seal An improved casing hanger and seal assembly includes a split seal ring disposed between annular plates on a support shoulder in a wellhead. A plurality of floating pedestals are received within the seal ring. A slip and bowl assembly is mounted over the s... | 07/16/1991 |
| 5031695 | Well casing hanger with wide temperature range seal A well casing hanger with a wide temperature range seal element that is energized by axial compression with a pre-determined initial portion of the casing hang load, the remaining portion of that hang load then being transferred to the wellhead or other s... | 07/16/1991 |
| 4919459 | Metal-to-metal backseat lockdown screw A lockdown screw having a gland nut threaded into a radially extending bore in a head. The radial bore is threaded only so far as to accommodate the gland nut. A stem is threaded into the gland nut for reciprocation into or out of the main bore of the hea... | 04/24/1990 |
| 4790379 | Wellhead hanger The hanger apparatus includes a segmented bowl structure which includes inner tapered surfaces which are adapted to coact with the outer surfaces of the slips supported on the bowl segments and a lower outer tapered seat which is adapted to engage a shoul... | 12/13/1988 |
| 4494778 | Casing hanger A casing hanger for hanging well casing and sealing the well pressure from the atmosphere. The casing hanger comprises a cooperating slip and slip bowl adapted to grip and retain the well casing when they abut a cooperating shoulder on the casing head whe... | 01/22/1985 |
| 4306742 | Pipe hanger A pipe hanger for supporting and sealing a tubular conduit in a producing well. The initial application of the tubular conduit weight to the hanger automatically actuates the seal and both sets of pipe gripping members. The upper set of pipe gripping slip... | 12/22/1981 |
| 4152015 | Casing hanger A casing hanger for supporting a casing from a casing head within a well bore having a split ring with sealing means attached thereto, a plurality of gripping assemblies supported from the split ring and each of said assemblies including a body with an in... | 05/01/1979 |
| 3994517 | Pipe anchor for wellhead assemblies A pipe anchoring device including an annular segmented support mounted in the bowl of a wellhead assembly. Each of the segments has a generally cylindrically shaped front face with a plurality of upwardly extending teeth thereon to engage a pipe, and a fr... | 11/30/1976 |
